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solidcraft-3d-print-dfm

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Use when designing any SolidCraft model meant for FDM 3D printing (written for a Bambu Lab A1 mini): wall, overhang and clearance rules, print-in-place hinges, orientation and pre-export checks.

skills/solidcraft-3d-print-dfm/SKILL.md

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# FDM design-for-print checklist (SolidCraft -> desktop FDM printer)

Written for a 0.4 mm nozzle on a Bambu Lab A1 mini (180 x 180 x 180 mm bed). The rules come from a public DFM guide (Unionfab, 2026) plus lessons from real prints. Items marked (UNVERIFIED) are working values that no real print has confirmed yet. Adjust them to your own printer and tell the maintainers what you measured.

## Before modelling
- Decide the PRINT ORIENTATION first and model in that pose (flat face on Z=0). Layers are weakest along Z, so loads must not pull layers apart.
- Keep the part inside about 170 mm on the A1 mini bed. Avoid tall thin features.
- Prefer a self-supporting design over supports. Target: no support at all.

## Geometry rules (0.4 mm nozzle)
- Walls: minimum 0.8 mm, in multiples of 0.4 (0.8, 1.2, 1.6, ...). Structural plates >= 2 mm. Thin tall plates need ribs or gussets rather than more thickness.
- Overhangs: <= 45 deg from vertical. Use 45 deg chamfers or teardrop profiles under horizontal holes and lips.
- Bridges: unsupported spans <= about 5 mm.
- Horizontal holes print slightly oval and undersize: add about 0.2 mm radius or use a teardrop. Vertical holes are more accurate. (compensation value UNVERIFIED)
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