What's going in?
Fit type
Filament
Orientation & print
Hole axis
First-layer squish / elephant foot
Model this hole
3.40mm
Diameter to draw in CAD
nominal 3.00mm + 0.40mm clearance
Why
PLA shrinks roughly 0.3 mm on hole walls. Vertical holes are tighter than horizontal because XY accuracy beats Z. Clearance fits add 0.4 mm over nominal for slide-through.
Quick reference
Clearance holes (slide-through fit) for M-series bolts, across common filaments. Vertical holes, tuned first layer.
| Bolt | PLA | PETG | ABS / ASA | Nylon | Resin |
|---|