Writing good prompts
How to write a prompt that yields a manufacturable model.
Writing good prompts
The model rewards specificity. Vague prompts produce vague geometry.
What to include
- Function: what does the part do?
- Envelope: bounding-box dimensions in mm or in.
- Interfaces: how does it mate with adjacent parts? Bolt pattern, slot, snap-fit?
- Material & process: SLA, FDM, CNC aluminum, sheet-metal, injection-molded?
- Constraints: wall thickness, draft angle, minimum hole diameter.
Examples
A 60×40×12 mm sheet-metal L-bracket in 2 mm stainless. Two M5 clearance holes on each face on a 40 mm pitch. Bend radius 3 mm.
A snap-fit lid for a 92×62×24 mm enclosure. PLA, 1.8 mm walls, four cantilever snaps along the long sides with 0.5 mm deflection.
The more your prompt reads like a machinist’s note, the better the output.