Revert "Forced pattern , separed to > 9 extruder"

This reverts commit 42b506ad85.

src/libslic3r/GCode.cpp

@@ -31,7 +31,6 @@
 #include <chrono>
 #include <iostream>
 #include <iterator>
-#include <limits>
 #include <numeric>
 #include <math.h>
 #include <stdlib.h>
@@ -3797,35 +3796,25 @@ size_t GCode::get_extruder_id(unsigned int filament_id) const
 // ---------------------------------------------------------------------------
 namespace {
 
-// Decode a manual pattern string (e.g. "1,2,12,11") into a sequence of
-// 1-based physical extruder IDs.
+// Decode a manual pattern string (e.g. "121212") into a sequence of
+// 1-based physical extruder IDs, honouring component_a / component_b aliases.
 static std::vector<unsigned int> decode_manual_pattern_sequence_for_gcode(
     const MixedFilament& mf, size_t num_physical)
 {
     std::vector<unsigned int> sequence;
-    if (mf.manual_pattern.empty() || num_physical == 0)
+    if (mf.manual_pattern.empty())
         return sequence;
-
-    const std::string normalized = MixedFilamentManager::normalize_manual_pattern(mf.manual_pattern);
-    if (normalized.empty())
-        return sequence;
-
-    std::stringstream ss(normalized);
-    std::string token;
-    while (std::getline(ss, token, ',')) {
-        if (token.empty())
-            continue;
-        try {
-            size_t consumed = 0;
-            const unsigned long value = std::stoul(token, &consumed);
-            if (consumed != token.size() || value == 0 || value > std::numeric_limits<unsigned int>::max())
-                continue;
-            const unsigned int extruder_id = static_cast<unsigned int>(value);
-            if (extruder_id >= 1 && extruder_id <= num_physical)
-                sequence.emplace_back(extruder_id);
-        } catch (...) {
-            continue;
-        }
+    sequence.reserve(mf.manual_pattern.size());
+    for (const char token : mf.manual_pattern) {
+        unsigned int extruder_id = 0;
+        if (token == '1')
+            extruder_id = mf.component_a;
+        else if (token == '2')
+            extruder_id = mf.component_b;
+        else if (token >= '3' && token <= '9')
+            extruder_id = unsigned(token - '0');
+        if (extruder_id >= 1 && extruder_id <= num_physical)
+            sequence.emplace_back(extruder_id);
     }
     return sequence;
 }
@@ -5834,16 +5823,32 @@ LayerResult GCode::process_layer(
         return inserted.first->second.empty() ? nullptr : &inserted.first->second;
     };
 
-    // Legacy grouped-perimeter pattern split is disabled for numeric comma-delimited
-    // manual patterns; commas now delimit physical filament IDs.
+    // Lambda: if `entity_type == PERIMETERS` and the configured filament has a grouped
+    // (comma-containing) manual pattern, return that filament's virtual 1-based ID so
+    // that split_extrusion_collection_for_multi_perimeter_pattern() can be used.
+    // Returns 0 when no grouped pattern applies.
     auto grouped_manual_pattern_mixed_filament_id =
         [&](const GCode::ObjectByExtruder::Island::Region::Type entity_type,
             const ExtrusionEntityCollection&                    entities,
             const PrintRegion&                                  region) -> unsigned int {
-        (void)entity_type;
         (void)entities;
-        (void)region;
-        return 0;
+        if (layer_tools.mixed_mgr == nullptr || layer_tools.num_physical == 0)
+            return 0;
+        if (entity_type != ObjectByExtruder::Island::Region::PERIMETERS)
+            return 0;
+        unsigned int filament_id_1based =
+            layer_tools.extruder_override != 0 ?
+                layer_tools.extruder_override :
+                unsigned(region.config().wall_filament.value);
+        if (!layer_tools.mixed_mgr->is_mixed(filament_id_1based, layer_tools.num_physical))
+            return 0;
+        const MixedFilament* mixed_row = layer_tools.mixed_mgr->mixed_filament_from_id(
+            filament_id_1based, layer_tools.num_physical);
+        if (mixed_row == nullptr)
+            return 0;
+        const std::string normalized_pattern =
+            MixedFilamentManager::normalize_manual_pattern(mixed_row->manual_pattern);
+        return normalized_pattern.find(',') != std::string::npos ? filament_id_1based : 0;
     };
 
     // Storage for dynamically-created split collections that must outlive the
@@ -6112,7 +6117,7 @@ LayerResult GCode::process_layer(
                             correct_extruder_id >= 0) {
 
                             // 1. Uniform-segment pointillism (SameLayerPointillisme with a
-                            //    simple ratio or a numeric manual pattern sequence).
+                            //    simple ratio or a non-comma manual pattern).
                             const unsigned int cfg_filament_id_1based =
                                 layer_tools.extruder_override != 0 ?
                                     layer_tools.extruder_override :
@@ -6180,8 +6185,8 @@ LayerResult GCode::process_layer(
                                 ++pointillism_path_split_fallbacks;
                             }
 
-                            // 2. Legacy grouped per-perimeter-index pattern path.
-                            //    Kept for compatibility plumbing; currently disabled.
+                            // 2. Grouped per-perimeter-index pattern (comma-separated manual
+                            //    pattern, e.g. "12,21").  Uses resolve_perimeter() via inset_idx.
                             if (entity_type == ObjectByExtruder::Island::Region::PERIMETERS) {
                                 const unsigned int grouped_id =
                                     grouped_manual_pattern_mixed_filament_id(

src/libslic3r/GCode/ToolOrdering.cpp

@@ -81,10 +81,13 @@ bool has_grouped_manual_pattern(const MixedFilamentManager *mixed_mgr,
                                 size_t                      num_physical,
                                 unsigned int                filament_id_1based)
 {
-    (void)mixed_mgr;
-    (void)num_physical;
-    (void)filament_id_1based;
-    return false;
+    if (!(mixed_mgr && mixed_mgr->is_mixed(filament_id_1based, num_physical)))
+        return false;
+    const MixedFilament *mixed_row = mixed_mgr->mixed_filament_from_id(filament_id_1based, num_physical);
+    if (mixed_row == nullptr)
+        return false;
+    const std::string normalized = MixedFilamentManager::normalize_manual_pattern(mixed_row->manual_pattern);
+    return normalized.find(',') != std::string::npos;
 }
 
 void append_unique_preserve_order(std::vector<unsigned int> &dst, unsigned int value)

src/libslic3r/MixedFilament.cpp

@@ -8,7 +8,6 @@
 #include <cmath>
 #include <cstdio>
 #include <cstdlib>
-#include <limits>
 #include <sstream>
 #include <iomanip>
 #include <numeric>
@@ -605,108 +604,69 @@ static bool decode_pattern_step(char c, char &out)
     }
 }
 
-static std::string trim_manual_pattern_token(const std::string &token)
+static std::vector<std::string> split_manual_pattern_groups(const std::string &pattern)
 {
-    size_t lo = 0;
-    size_t hi = token.size();
-    while (lo < hi && std::isspace(static_cast<unsigned char>(token[lo])))
-        ++lo;
-    while (hi > lo && std::isspace(static_cast<unsigned char>(token[hi - 1])))
-        --hi;
-    return token.substr(lo, hi - lo);
-}
-
-static bool parse_manual_pattern_id_token(const std::string &token, unsigned int &out)
-{
-    const std::string trimmed = trim_manual_pattern_token(token);
-    if (trimmed.empty())
-        return false;
-
-    for (const char c : trimmed)
-        if (!std::isdigit(static_cast<unsigned char>(c)))
-            return false;
-
-    try {
-        size_t consumed = 0;
-        const unsigned long value = std::stoul(trimmed, &consumed);
-        if (consumed != trimmed.size() || value == 0 || value > std::numeric_limits<unsigned int>::max())
-            return false;
-        out = static_cast<unsigned int>(value);
-        return true;
-    } catch (...) {
-        return false;
-    }
-}
-
-static bool parse_manual_pattern_numeric_ids(const std::string &pattern, std::vector<unsigned int> &out)
-{
-    out.clear();
+    std::vector<std::string> groups;
     if (pattern.empty())
-        return false;
+        return groups;
 
-    std::stringstream ss(pattern);
-    std::string token;
-    while (std::getline(ss, token, ',')) {
-        unsigned int id = 0;
-        if (!parse_manual_pattern_id_token(token, id))
-            return false;
-        out.emplace_back(id);
-    }
-    return !out.empty();
-}
-
-static std::string encode_manual_pattern_ids(const std::vector<unsigned int> &ids)
-{
-    if (ids.empty())
-        return {};
-
-    std::ostringstream out;
-    bool first = true;
-    for (const unsigned int id : ids) {
-        if (id == 0)
+    std::string current;
+    for (const char c : pattern) {
+        if (c == ',') {
+            if (!current.empty()) {
+                groups.emplace_back(std::move(current));
+                current.clear();
+            }
             continue;
-        if (!first)
-            out << ',';
-        first = false;
-        out << id;
+        }
+        current.push_back(c);
     }
-    return out.str();
+    if (!current.empty())
+        groups.emplace_back(std::move(current));
+    return groups;
 }
 
-static std::vector<unsigned int> decode_manual_pattern_ids_for_physical(const std::string &pattern, size_t num_physical)
+static std::string flatten_manual_pattern_groups(const std::string &pattern)
 {
-    std::vector<unsigned int> parsed;
-    if (!parse_manual_pattern_numeric_ids(pattern, parsed) || num_physical == 0)
-        return {};
+    std::string flattened;
+    flattened.reserve(pattern.size());
+    for (const char c : pattern)
+        if (c != ',')
+            flattened.push_back(c);
+    return flattened;
+}
 
-    std::vector<unsigned int> out;
-    out.reserve(parsed.size());
-    for (const unsigned int id : parsed)
-        if (id >= 1 && id <= num_physical)
-            out.emplace_back(id);
-    return out;
+static unsigned int physical_filament_from_pattern_step(char token, const MixedFilament &mf, size_t num_physical)
+{
+    if (token == '1')
+        return mf.component_a;
+    if (token == '2')
+        return mf.component_b;
+    if (token >= '3' && token <= '9') {
+        const unsigned int direct = unsigned(token - '0');
+        if (direct >= 1 && direct <= num_physical)
+            return direct;
+    }
+    return 0;
 }
 
 static int mix_percent_from_normalized_pattern(const std::string &pattern)
 {
-    std::vector<unsigned int> ids;
-    if (!parse_manual_pattern_numeric_ids(pattern, ids) || ids.empty())
+    const std::vector<std::string> groups = split_manual_pattern_groups(pattern);
+    if (groups.empty())
         return 50;
 
-    const unsigned int first = ids.front();
-    unsigned int second = 0;
-    for (const unsigned int id : ids) {
-        if (id != first) {
-            second = id;
-            break;
-        }
+    // For grouped patterns, blend preview is the average of each perimeter
+    // group's own cadence. This keeps simple outer/inner patterns like
+    // "12,21" at 50/50 and "11111112,11121111" at 12.5%.
+    double blend_b = 0.0;
+    for (const std::string &group : groups) {
+        if (group.empty())
+            continue;
+        const int count_b = int(std::count(group.begin(), group.end(), '2'));
+        blend_b += double(count_b) / double(group.size());
     }
-
-    if (second == 0)
-        return 0;
-
-    const int count_second = int(std::count(ids.begin(), ids.end(), second));
-    return clamp_int(int(std::lround(100.0 * double(count_second) / double(ids.size()))), 0, 100);
+    return clamp_int(int(std::lround(100.0 * blend_b / double(groups.size()))), 0, 100);
 }
 
 static std::string normalize_gradient_component_ids(const std::string &components)
@@ -924,16 +884,25 @@ static std::vector<unsigned int> build_weighted_gradient_sequence(const std::vec
     return sequence;
 }
 
+static unsigned int decode_manual_pattern_preview_token(char token, unsigned int component_a, unsigned int component_b, size_t num_physical)
+{
+    unsigned int extruder_id = 0;
+    if (token == '1')
+        extruder_id = component_a;
+    else if (token == '2')
+        extruder_id = component_b;
+    else if (token >= '3' && token <= '9')
+        extruder_id = unsigned(token - '0');
+
+    return (extruder_id >= 1 && extruder_id <= num_physical) ? extruder_id : 0;
+}
+
 static std::vector<unsigned int> build_grouped_manual_pattern_preview_sequence(const std::string &pattern,
                                                                                unsigned int       component_a,
                                                                                unsigned int       component_b,
                                                                                size_t             num_physical,
                                                                                size_t             wall_loops)
 {
-    (void)component_a;
-    (void)component_b;
-    (void)wall_loops;
-
     std::vector<unsigned int> sequence;
     if (num_physical == 0)
         return sequence;
@@ -942,7 +911,49 @@ static std::vector<unsigned int> build_grouped_manual_pattern_preview_sequence(c
     if (normalized.empty())
         return sequence;
 
-    return decode_manual_pattern_ids_for_physical(normalized, num_physical);
+    const std::vector<std::string> groups = split_manual_pattern_groups(normalized);
+    if (groups.empty())
+        return sequence;
+
+    if (groups.size() == 1) {
+        sequence.reserve(normalized.size());
+        for (const char token : normalized) {
+            const unsigned int extruder_id =
+                decode_manual_pattern_preview_token(token, component_a, component_b, num_physical);
+            if (extruder_id != 0)
+                sequence.emplace_back(extruder_id);
+        }
+        return sequence;
+    }
+
+    constexpr size_t k_max_preview_cycle = 48;
+    size_t cycle = 1;
+    for (const std::string &group : groups) {
+        if (group.empty())
+            continue;
+        cycle = std::lcm(cycle, group.size());
+        if (cycle >= k_max_preview_cycle) {
+            cycle = k_max_preview_cycle;
+            break;
+        }
+    }
+
+    const size_t preview_wall_loops = std::max<size_t>(1, wall_loops == 0 ? groups.size() : wall_loops);
+    sequence.reserve(preview_wall_loops * cycle);
+    for (size_t layer_idx = 0; layer_idx < cycle; ++layer_idx) {
+        for (size_t wall_idx = 0; wall_idx < preview_wall_loops; ++wall_idx) {
+            const std::string &group = groups[std::min(wall_idx, groups.size() - 1)];
+            if (group.empty())
+                continue;
+            const char token = group[layer_idx % group.size()];
+            const unsigned int extruder_id =
+                decode_manual_pattern_preview_token(token, component_a, component_b, num_physical);
+            if (extruder_id != 0)
+                sequence.emplace_back(extruder_id);
+        }
+    }
+
+    return sequence;
 }
 
 static std::pair<int, int> effective_pair_preview_ratios(int percent_b)
@@ -1471,8 +1482,10 @@ std::string compute_mixed_filament_display_color(const MixedFilament &entry, con
 std::string mixed_filament_standardized_name(const MixedFilament &entry, size_t num_physical)
 {
     const std::string normalized_pattern = MixedFilamentManager::normalize_manual_pattern(entry.manual_pattern);
-    if (!normalized_pattern.empty())
-        return std::string("Pattern ") + normalized_pattern;
+    if (!normalized_pattern.empty()) {
+        const std::string flattened = flatten_manual_pattern_groups(normalized_pattern);
+        return std::string("Pattern ") + (flattened.empty() ? normalized_pattern : flattened);
+    }
 
     std::vector<std::pair<unsigned int, int>> parts;
     parts.reserve(4);
@@ -1682,31 +1695,31 @@ void MixedFilamentManager::clear_custom_entries()
 
 std::string MixedFilamentManager::normalize_manual_pattern(const std::string &pattern)
 {
-    if (pattern.empty())
-        return std::string();
-
-    std::vector<unsigned int> ids;
-    if (pattern.find(',') != std::string::npos) {
-        if (!parse_manual_pattern_numeric_ids(pattern, ids))
-            return std::string();
-        return encode_manual_pattern_ids(ids);
-    }
-
-    // Backward compatibility for legacy compact patterns like "1212" and "A/B".
+    std::string normalized;
+    normalized.reserve(pattern.size());
+    bool current_group_has_steps = false;
     for (char c : pattern) {
         char step = '\0';
         if (decode_pattern_step(c, step)) {
-            ids.emplace_back(unsigned(step - '0'));
+            normalized.push_back(step);
+            current_group_has_steps = true;
+            continue;
+        }
+        if (c == ',') {
+            if (!current_group_has_steps)
+                return std::string();
+            normalized.push_back(',');
+            current_group_has_steps = false;
             continue;
         }
         if (is_pattern_separator(c))
             continue;
+        // Unknown token => invalid pattern.
         return std::string();
     }
-
-    if (ids.empty())
+    if (!normalized.empty() && normalized.back() == ',')
         return std::string();
-    return encode_manual_pattern_ids(ids);
+    return normalized;
 }
 
 int MixedFilamentManager::mix_percent_from_manual_pattern(const std::string &pattern)
@@ -1973,14 +1986,16 @@ unsigned int MixedFilamentManager::resolve(unsigned int filament_id,
 
     const MixedFilament &mf = m_mixed[size_t(mixed_idx)];
 
-    // Manual pattern takes precedence when provided.
-    // Pattern stores comma-separated 1-based physical filament IDs.
+    // Manual pattern takes precedence when provided. Pattern uses repeating
+    // steps: '1' => component_a, '2' => component_b, '3'..'9' => direct
+    // physical filament IDs.
     if (!mf.manual_pattern.empty()) {
-        const std::string normalized_pattern = normalize_manual_pattern(mf.manual_pattern);
-        const std::vector<unsigned int> pattern_ids = decode_manual_pattern_ids_for_physical(normalized_pattern, num_physical);
-        if (!pattern_ids.empty()) {
-            const int pos = safe_mod(layer_index, int(pattern_ids.size()));
-            return pattern_ids[size_t(pos)];
+        const std::string flattened_pattern = flatten_manual_pattern_groups(mf.manual_pattern);
+        if (!flattened_pattern.empty()) {
+            const int pos = safe_mod(layer_index, int(flattened_pattern.size()));
+            const unsigned int resolved = physical_filament_from_pattern_step(flattened_pattern[size_t(pos)], mf, num_physical);
+            if (resolved >= 1 && resolved <= num_physical)
+                return resolved;
         }
         return mf.component_a;
     }
@@ -2034,12 +2049,25 @@ unsigned int MixedFilamentManager::resolve_perimeter(unsigned int filament_id,
                                                      float        layer_height,
                                                      bool         force_height_weighted) const
 {
-    (void)perimeter_index;
-
     const int mixed_idx = mixed_index_from_filament_id(filament_id, num_physical);
     if (mixed_idx < 0)
         return filament_id;
 
+    const MixedFilament &mf = m_mixed[size_t(mixed_idx)];
+    if (!mf.manual_pattern.empty()) {
+        const std::vector<std::string> pattern_groups = split_manual_pattern_groups(mf.manual_pattern);
+        if (!pattern_groups.empty()) {
+            const size_t group_idx = size_t(std::max(0, perimeter_index));
+            const std::string &group = pattern_groups[std::min(group_idx, pattern_groups.size() - 1)];
+            if (!group.empty()) {
+                const int pos = safe_mod(layer_index, int(group.size()));
+                const unsigned int resolved = physical_filament_from_pattern_step(group[size_t(pos)], mf, num_physical);
+                if (resolved >= 1 && resolved <= num_physical)
+                    return resolved;
+            }
+        }
+    }
+
     return resolve(filament_id, num_physical, layer_index, layer_print_z, layer_height, force_height_weighted);
 }
 
@@ -2060,6 +2088,10 @@ unsigned int MixedFilamentManager::effective_painted_region_filament_id(unsigned
     if (mf.distribution_mode == int(MixedFilament::SameLayerPointillisme))
         return filament_id;
 
+    const std::string normalized_pattern = normalize_manual_pattern(mf.manual_pattern);
+    if (normalized_pattern.find(',') != std::string::npos)
+        return filament_id;
+
     const bool is_custom_mixed = mf.custom;
     if (!is_custom_mixed && (layer_height_a > 0.f || layer_height_b > 0.f)) {
         const float safe_base = std::max<float>(0.01f, base_layer_height);
@@ -2091,7 +2123,7 @@ float MixedFilamentManager::component_surface_offset(unsigned int filament_id,
         return 0.f;
 
     const std::string normalized_pattern = normalize_manual_pattern(mixed_row->manual_pattern);
-    if (!normalized_pattern.empty())
+    if (normalized_pattern.find(',') != std::string::npos)
         return 0.f;
 
     const unsigned int resolved = resolve(filament_id,
@@ -2125,11 +2157,19 @@ std::vector<unsigned int> MixedFilamentManager::ordered_perimeter_extruders(unsi
 
     const MixedFilament &mf = m_mixed[size_t(mixed_idx)];
     if (!mf.manual_pattern.empty()) {
-        const std::string normalized_pattern = normalize_manual_pattern(mf.manual_pattern);
-        const std::vector<unsigned int> pattern_ids = decode_manual_pattern_ids_for_physical(normalized_pattern, num_physical);
-        if (!pattern_ids.empty()) {
-            ordered.reserve(pattern_ids.size());
-            for (const unsigned int resolved : pattern_ids) {
+        const std::vector<std::string> pattern_groups = split_manual_pattern_groups(mf.manual_pattern);
+        if (!pattern_groups.empty()) {
+            ordered.reserve(pattern_groups.size());
+            for (size_t group_idx = 0; group_idx < pattern_groups.size(); ++group_idx) {
+                const unsigned int resolved = resolve_perimeter(filament_id,
+                                                                num_physical,
+                                                                layer_index,
+                                                                int(group_idx),
+                                                                layer_print_z,
+                                                                layer_height,
+                                                                force_height_weighted);
+                if (resolved < 1 || resolved > num_physical)
+                    continue;
                 if (std::find(ordered.begin(), ordered.end(), resolved) == ordered.end())
                     ordered.emplace_back(resolved);
             }

src/libslic3r/MixedFilament.hpp

@@ -40,9 +40,9 @@ struct MixedFilament
     // Blend percentage of component B in [0..100].
     int mix_b_percent = 50;
 
-    // Optional manual pattern for this mixed filament.
-    // Canonical format: comma-separated 1-based physical filament IDs
-    // (for example "1,2,12,11").
+    // Optional manual pattern for this mixed filament. Tokens:
+    // '1' => component_a, '2' => component_b, '3'..'9' => direct physical
+    // filament IDs (1-based). Example: "11112222" => AAAABBBB repeating.
     std::string manual_pattern;
 
     // Optional explicit gradient multi-color component list, encoded as
@@ -145,7 +145,7 @@ std::pair<int, int> mixed_filament_apparent_pair_percentages(const MixedFilament
 std::string compute_mixed_filament_display_color(const MixedFilament &entry, const MixedFilamentDisplayContext &context);
 
 // Build a standardized user-facing mixed filament name.
-// - Pattern rows: "Pattern <normalized pattern>" (for example "Pattern 1,2,12,11").
+// - Pattern rows: "Pattern <flattened pattern>" (for example "Pattern 1212354").
 // - Mix rows: "<id>:<pct>% + <id>:<pct>% ..." (for example "1:30% + 2:20% + 3:50%").
 std::string mixed_filament_standardized_name(const MixedFilament &entry, size_t num_physical);
 
@@ -197,9 +197,8 @@ public:
     std::string serialize_custom_entries();
     void load_custom_entries(const std::string &serialized, const std::vector<std::string> &filament_colours);
 
-    // Normalize a manual mixed-pattern string into comma-separated numeric IDs.
-    // Legacy compact patterns are still accepted for backward compatibility.
-    // Returns empty string if invalid.
+    // Normalize a manual mixed-pattern string into compact token form.
+    // Accepts separators and A/B aliases. Returns empty string if invalid.
     static std::string normalize_manual_pattern(const std::string &pattern);
     static int         mix_percent_from_manual_pattern(const std::string &pattern);
 

src/libslic3r/PrintApply.cpp

@@ -4,8 +4,6 @@
 
 #include <boost/log/trivial.hpp>
 #include <cfloat>
-#include <limits>
-#include <sstream>
 
 namespace Slic3r {
 
@@ -1142,23 +1140,16 @@ static void append_mixed_component_extruders(const MixedFilamentManager &mixed_m
         append_unique_painted_extruder(painting_extruders, unsigned(token - '0'), num_physical_extruders);
     }
 
-    const std::string normalized_pattern = MixedFilamentManager::normalize_manual_pattern(mixed_row->manual_pattern);
-    if (!normalized_pattern.empty()) {
-        std::stringstream ss(normalized_pattern);
-        std::string token;
-        while (std::getline(ss, token, ',')) {
-            if (token.empty())
-                continue;
-            try {
-                size_t consumed = 0;
-                const unsigned long value = std::stoul(token, &consumed);
-                if (consumed != token.size() || value == 0 || value > std::numeric_limits<unsigned int>::max())
-                    continue;
-                append_unique_painted_extruder(painting_extruders, static_cast<unsigned int>(value), num_physical_extruders);
-            } catch (...) {
-                continue;
-            }
-        }
+    for (char token : mixed_row->manual_pattern) {
+        unsigned int extruder_id = 0;
+        if (token == '1')
+            extruder_id = mixed_row->component_a;
+        else if (token == '2')
+            extruder_id = mixed_row->component_b;
+        else if (token >= '3' && token <= '9')
+            extruder_id = unsigned(token - '0');
+
+        append_unique_painted_extruder(painting_extruders, extruder_id, num_physical_extruders);
     }
 }
 

src/slic3r/GUI/MixedFilamentConfigPanel.cpp

@@ -33,7 +33,6 @@
 
 #include <algorithm>
 #include <cmath>
-#include <limits>
 #include <numeric>
 #include <sstream>
 #include <string>
@@ -51,21 +50,39 @@ namespace Slic3r { namespace GUI {
 namespace {
 
 // -- Plater.cpp:4849 --------------------------------------------------------
-static bool parse_manual_pattern_preview_id_token(const std::string &token, unsigned int &out)
+static std::vector<std::string> split_manual_pattern_preview_groups(const std::string &pattern)
 {
-    if (token.empty())
-        return false;
+    std::vector<std::string> groups;
+    if (pattern.empty())
+        return groups;
 
-    try {
-        size_t consumed = 0;
-        const unsigned long value = std::stoul(token, &consumed);
-        if (consumed != token.size() || value == 0 || value > std::numeric_limits<unsigned int>::max())
-            return false;
-        out = static_cast<unsigned int>(value);
-        return true;
-    } catch (...) {
-        return false;
+    std::string current;
+    for (const char c : pattern) {
+        if (c == ',') {
+            if (!current.empty()) {
+                groups.emplace_back(std::move(current));
+                current.clear();
+            }
+            continue;
+        }
+        current.push_back(c);
     }
+    if (!current.empty())
+        groups.emplace_back(std::move(current));
+    return groups;
+}
+
+static unsigned int decode_manual_pattern_preview_token(char token, unsigned int component_a, unsigned int component_b, size_t num_physical)
+{
+    unsigned int extruder_id = 0;
+    if (token == '1')
+        extruder_id = component_a;
+    else if (token == '2')
+        extruder_id = component_b;
+    else if (token >= '3' && token <= '9')
+        extruder_id = unsigned(token - '0');
+
+    return (extruder_id >= 1 && extruder_id <= num_physical) ? extruder_id : 0;
 }
 
 static std::vector<unsigned int> build_grouped_manual_pattern_preview_sequence(const std::string &pattern,
@@ -74,10 +91,6 @@ static std::vector<unsigned int> build_grouped_manual_pattern_preview_sequence(c
                                                                                size_t             num_physical,
                                                                                size_t             wall_loops)
 {
-    (void)component_a;
-    (void)component_b;
-    (void)wall_loops;
-
     std::vector<unsigned int> sequence;
     if (num_physical == 0)
         return sequence;
@@ -86,14 +99,46 @@ static std::vector<unsigned int> build_grouped_manual_pattern_preview_sequence(c
     if (normalized.empty())
         return sequence;
 
-    std::stringstream ss(normalized);
-    std::string token;
-    while (std::getline(ss, token, ',')) {
-        unsigned int id = 0;
-        if (!parse_manual_pattern_preview_id_token(token, id))
+    const std::vector<std::string> groups = split_manual_pattern_preview_groups(normalized);
+    if (groups.empty())
+        return sequence;
+
+    if (groups.size() == 1) {
+        sequence.reserve(normalized.size());
+        for (const char token : normalized) {
+            const unsigned int extruder_id =
+                decode_manual_pattern_preview_token(token, component_a, component_b, num_physical);
+            if (extruder_id != 0)
+                sequence.emplace_back(extruder_id);
+        }
+        return sequence;
+    }
+
+    constexpr size_t k_max_preview_cycle = 48;
+    size_t cycle = 1;
+    for (const std::string &group : groups) {
+        if (group.empty())
             continue;
-        if (id >= 1 && id <= num_physical)
-            sequence.emplace_back(id);
+        cycle = std::lcm(cycle, group.size());
+        if (cycle >= k_max_preview_cycle) {
+            cycle = k_max_preview_cycle;
+            break;
+        }
+    }
+
+    const size_t preview_wall_loops = std::max<size_t>(1, wall_loops == 0 ? groups.size() : wall_loops);
+    sequence.reserve(preview_wall_loops * cycle);
+    for (size_t layer_idx = 0; layer_idx < cycle; ++layer_idx) {
+        for (size_t wall_idx = 0; wall_idx < preview_wall_loops; ++wall_idx) {
+            const std::string &group = groups[std::min(wall_idx, groups.size() - 1)];
+            if (group.empty())
+                continue;
+            const char token = group[layer_idx % group.size()];
+            const unsigned int extruder_id =
+                decode_manual_pattern_preview_token(token, component_a, component_b, num_physical);
+            if (extruder_id != 0)
+                sequence.emplace_back(extruder_id);
+        }
     }
 
     return sequence;
@@ -1171,9 +1216,10 @@ void MixedFilamentConfigPanel::build_ui()
         pattern_row->Add(pattern_label, 0, wxALIGN_CENTER_VERTICAL | wxRIGHT, gap);
         m_pattern_ctrl = new wxTextCtrl(this, wxID_ANY, from_u8(normalized_pattern), wxDefaultPosition,
                                         wxSize(FromDIP(200), -1), wxTE_PROCESS_ENTER);
-        m_pattern_ctrl->SetToolTip(_L("Manual repeating pattern. Enter physical filament IDs as comma-separated numbers. "
-                          "Values greater than 9 are supported. "
-                          "Example: 1,2,12,11."));
+        m_pattern_ctrl->SetToolTip(_L("Manual repeating pattern. Use 1/2 or A/B for component A/B, "
+                                      "and 3..9 for direct physical filament IDs. "
+                                      "Use commas to define deeper perimeter patterns, for example 12,21. "
+                                      "Example: 1/1/1/1/2/2/2/2, 12,21, or 1/2/3/4."));
         pattern_row->Add(m_pattern_ctrl, 1, wxALIGN_CENTER_VERTICAL);
         root->Add(pattern_row, 0, wxEXPAND | wxLEFT | wxRIGHT | wxTOP, gap);
 
@@ -1237,7 +1283,7 @@ void MixedFilamentConfigPanel::build_ui()
     const wxString bias_tooltip =
         _L("Positive bias recesses the second filament in the pair; negative bias recesses the first filament.\n\n"
            "The color chip shows which filament the current value affects.\n\n"
-           "Manual patterns and Local-Z dithering ignore it.");
+           "Grouped wall patterns and Local-Z dithering ignore it.");
 
     auto *surface_offset_label = new wxStaticText(this, wxID_ANY, _L("Bias"));
     surface_offset_label->SetForegroundColour(is_dark ? wxColour(236, 236, 236) : wxColour(20, 20, 20));
@@ -1379,7 +1425,7 @@ void MixedFilamentConfigPanel::build_ui()
         if (m_pattern_ctrl) {
             m_mf.distribution_mode = int(MixedFilament::Simple);
             std::string normalized = MixedFilamentManager::normalize_manual_pattern(into_u8(m_pattern_ctrl->GetValue()));
-            if (normalized.empty()) normalized = "1,2";
+            if (normalized.empty()) normalized = "12";
             if (into_u8(m_pattern_ctrl->GetValue()) != normalized)
                 m_pattern_ctrl->ChangeValue(from_u8(normalized));
             m_mf.manual_pattern = normalized;
@@ -1639,8 +1685,8 @@ void MixedFilamentConfigPanel::build_ui()
             std::string pattern = into_u8(m_pattern_ctrl->GetValue());
             if (!pattern.empty()) {
                 const char last = pattern.back();
-                if (last != ',')
-                    pattern.push_back(',');
+                const bool has_sep = last == '/' || last == '-' || last == '_' || last == '|' || last == ':' || last == ';' || last == ',' || last == ' ';
+                if (!has_sep) pattern.push_back('/');
             }
             pattern += std::to_string(filament_id);
             m_pattern_ctrl->ChangeValue(from_u8(pattern));

src/slic3r/GUI/Plater.cpp

@@ -2471,7 +2471,7 @@ Sidebar::Sidebar(Plater *parent)
         mgr.add_custom_filament(1, 2, 50, colors);
         auto &mfs = mgr.mixed_filaments();
         if (!mfs.empty()) {
-            mfs.back().manual_pattern = "1,2";
+            mfs.back().manual_pattern = "12";
             mfs.back().custom = true;
         }
         if (ConfigOptionString *opt = wxGetApp().preset_bundle->project_config.option<ConfigOptionString>("mixed_filament_definitions"))