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harrierpigeon
6b304884d2
On a belt the parts print in belt order, so every colour change between parts is a filament change. Arrange packs items in extruder order already, but it grew the pile around its centre, so the colours ended up interleaved. A belt print now packs from the leading end of the bed, each row filling across the belt before the pile advances, and the objective charges an item for every packed part of another colour it does not fully follow along the belt, counting the tilted layers that reach cot(angle) * height past a part, so each colour prints as one run. The direction follows the slicing rotation: a rotation about X prints toward +Y, one about Y toward -X, and a negative angle flips it. Packing from the edge also means the brim has to be kept on the bed: a belt brim is printed brim_width wide for every brim type, so that much is reserved along every edge (between parts the brims may overlap, as on any printer). The purge prism is regenerated from the arranged parts, flush with the far edge of the bed, yet arrange moved it about like a part and packed parts into the strip it comes back to. Arrange now skips the prism and reserves its strip with a fixed virtual item, like a bed exclusion area, whenever the parts use more than one filament. The prism's length follows the parts plus a ramp per unit of height; with the height at its cap that ran 100 mm past the end of a 500 mm belt and the project could not print. The bar now stops at the plate end, and the purge planner's existing warning reports what the shortened bar cannot absorb.