Design guide hub
All DFM topics on one route.
Design guide hubDFM
Shrinkage Compensation: Injection Molding Design Rules
Shrink happens in the mold steel offset, not by hoping the part scales uniformly.
DFM
Dimension critical interfaces, let the mold scale the rest
Rules NetProto DFM review checks against before steel is ordered.
Resin grade and fill direction change shrink behavior.
Call out datums and critical fits instead of over dimensioning every cosmetic edge.
CAD checklist
Send this with your upload
Missing DFM inputs delay qualified quotes.
Critical fit dimensions
Resin grade on drawing
Datum scheme if GD&T used
Related rules
Design guide
Jump to sibling rules before you freeze CAD.
DFM article
Long form engineer guide.
DFM articleWall thickness
Design rules for wall thickness.
Wall thicknessDraft angle
Design rules for draft angle.
Draft angleRib design
Design rules for rib design.
Rib designFAQ
Common questions
Should CAD be pre scaled?
Usually mold is scaled; provide nominal part intent dimensions.
Next step
Upload CAD for DFM-aware quoting
One hardened steel tool quote with piece price on the same upload.