A cloisonné wall has to be thicker than one extrusion
Traced line art is routinely far thinner than a printable wall. On one dragonfly illustration the veins measured 0.30 mm at print scale — under a single 0.42 mm extrusion, so the slicer dropped them outright and the resin cells ran together into each other.
The fix is not to thicken everything. Growing whatever is thin in every colour grows the cells too, and on line art the cells are thin as well, so they merge across their own veins: the same dragonfly went from 32 wells to 14, and one strength further up, to 1. So the wall colour is grown and no other, clipped to the artwork union so the silhouette never moves, and applied after per-shape recolouring so it follows the colours you can actually see. A 0.4 mm wall takes that 0.30 mm vein to 1.10 mm.
Measured on one illustration
- Traced vein width
- 0.30 mm
- One extrusion
- 0.42 mm
- After a 0.4 mm wall
- 1.10 mm
- Resin cells on that pin
- 32
- Cells left after Thicken
- 1