A preset whose layer height exceeds ~45% of the outer wall line width has
less than ~6 degrees of reserve on a 45 degree wall (max self-supporting
angle atan((w-h)/h)), and support cannot compensate because the 45 degree
stair tread is only h wide - far below one support line. Those presets are
not usable in practice, so shipping them only invites failed prints.
Removes the 22 rungs above h/w = 0.45 and prunes them from the vendor
index. What remains per nozzle (default first):
CHX 350 0.4: 0.18 | 0.6: 0.24 0.28 | 0.8: 0.32 0.36
1.0: 0.44 0.48 | 1.2: 0.48 0.56
MBL 0.4: 0.18 | 0.6: 0.24 0.28 | 0.8: 0.36 0.34
1.0: 0.44 0.48 | 1.2: 0.48 0.56
The 0.4 nozzle keeps a single rung: 0.20 mm would qualify (h/w = 0.435) but
divides both screw leads evenly (4/0.20, 8/0.20) and stays excluded by the
Z-artifact rule, and 0.22 is already at 0.478.
Also corrects the MBL 0.8 default to 0.36 mm, which at w = 0.92 sits at
h/w = 0.391 and therefore still satisfies the stricter 40% default rule.
Print feedback on CHX 350 with a 0.8 nozzle at 0.44 mm layer height showed
curling at the retraction points with the derived value of 25 s. There is no
cooling headroom left to trade: fdm_filament_pla pins fan_min_speed =
fan_max_speed = 100, and additional_cooling_fan_speed is inert because no
Meltingplot machine enables auxiliary_fan. Minimum layer time is the only
remaining lever; 35 s prints cleanly at that geometry.
The cross-section rule only fixes the ratios between nozzle sizes, so this
is a calibration of the PLA anchor itself: both PLA ladders are scaled by
1.5 (Extrudr 9/20/38/56/83 s, Meltingplot PLA 8/17/30/45/66 s for
0.4/0.6/0.8/1.0/1.2). The Extrudr base fan_cooling_layer_time goes 60 -> 100
so the 1.2-nozzle value stays below it.
Other materials are left unchanged - only the PLA anchor has a real
counter-example so far.
A 45 deg slope shifts each bead outward by exactly one layer height. With
the Slic3r bead model (rectangle (w-h) x h plus half-circles of diameter h)
the flat contact band to the layer below is w - 2h, so the maximum
self-supporting angle is atan((w-h)/h). Support cannot compensate: the
stair tread at 45 deg is only h wide, far below one support line width, so
no support line ever fits underneath a single step.
All ten machine variants defaulted to h/w = 0.455..0.524, i.e. at or past
the h/w = 0.5 point where the flat contact vanishes. The 0.8 nozzle default
(0.44 mm at w = 0.84) reached atan(0.4/0.44) = 42.3 deg and failed on 45 deg
slopes even with support.
Default presets now satisfy h <= 0.40 * outer_wall_line_width, which leaves
one third of the bead's flat underside in contact at 45 deg and puts the
geometric limit at 56.3 deg. To keep the defaults on sensible ladder rungs,
outer wall width is widened where it was the binding constraint:
chx_small 110 -> 115%, chx_large 105 -> 110%, mbl_04 105 -> 115%.
Ladders are unchanged; the thicker rungs stay available for parts without
steep overhangs.
Add a G90 / G1 Z{min(max_layer_z + 5, printable_height)} F600 move at the
start of machine_end_gcode, before M98 print_end shuts the printer down and
parks it. Besides clearing the part, the explicit Z coordinate lets the Duet
file-info parser pick up the object height.
Minimum layer time follows the derived cooling rule: heat per layer
scales with bead cross-section (layer height x line width), so the
0.8-nozzle-tuned values are scaled by q(d)/q(0.8) using each nozzle's
standard preset geometry. Bases carry the 1.2 value, children @0.4-@1.0
their nozzle-specific value.
Caps now follow V = 34*d * m / S: the 34*d limit line calibrated on
Micro Swiss Volcano plated copper at 2.85 mm, material factor m from
the OrcaFilamentLibrary generic ratios (PLA/ABS/ASA 1.0, PETG 10/12,
PETG-CF 11.5/12, PA-CF 8/12, PLA Matte 11/12), safety factor S = 1.25
covering batch/moisture/wear/diameter tolerances.
Each material base now serves the 1.2 nozzle at its maximum cap;
children @0.4-@1.0 lower the cap per nozzle. Machine variant
default_filament_profile entries point at the matching preset.
Per the profile creation guide, vendor filament profiles now inherit
from Generic * @System instead of vendor-local fdm_filament_* copies.
Each profile carries only Meltingplot-specific deviations plus the
2.85 mm filament diameter; the seven local fdm_filament_* base files
are removed.
Deliberate pins where the library default would change tuned behavior:
- PLA/ABS/TitanX keep filament_max_volumetric_speed 20 (0.6 nozzle cap)
- ABS/PET-CF15 keep close_fan_the_first_x_layers 1
- STYX 12 sets required_nozzle_HRC 0 (unfilled PA12, density 1.02)
Cap filament volumetric speed per nozzle (0.4: 14, 0.6: 20, 0.8: 26,
1.0: 30, 1.2: 40 mm3/s). Filaments whose limit exceeds a nozzle's
capability get a nozzle-scoped child profile that only lowers
filament_max_volumetric_speed; filament_id is inherited so all nozzle
variants remain the same material.
Also include layer height and nozzle diameter in the g-code filename.
Adds the Meltingplot vendor bundle with 5 printer models:
- CHX 350 (880x422x943, RepRapFirmware/Duet)
- MBL 133/136/308/480 (RepRapFirmware/Duet)
Each model ships 0.4/0.6/0.8/1.0/1.2 nozzle variants. Layer height
presets span 40-60% of the nozzle diameter and deliberately avoid
heights that divide the Z screw lead evenly (CHX: 1204 ball screw,
4 mm lead; MBL: TR4x2 trapezoidal screw, 8 mm lead) so periodic
screw error does not repeat as banding.
All printers use 2.85 mm filament, so the bundle carries its own
filament library (PLA, StoneFil, ABS, TitanX, ASA, PETG, PA6 CF HT,
STYX 12, PP 9-2, PET-CF15, Extrudr PLA NX2 Matt, Igus iglidur J260)
with the 2.85 mm diameter pinned once in the vendor-local
fdm_filament_common base.
Machine limits mirror the printers' firmware configuration; machine
limit emission is disabled so the values only feed the time estimator.
timschneider