Design guide hub
All DFM topics on one route.
Design guide hubDFM
Fillets and Radii: Injection Molding Design Rules
Sharp internal corners stall flow and concentrate stress.
DFM
Radius internal corners before you add ribs
Rules NetProto DFM review checks against before steel is ordered.
CNC habits of zero radius inside pockets do not translate cleanly to molding.
Consistent radii help polish and vent paths in the mold.
CAD checklist
Send this with your upload
Missing DFM inputs delay qualified quotes.
Minimum internal radius callout
External corner break notes
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
Do fillets affect draft?
They change effective pull direction on some faces. Review on CAD.
Next step
Upload CAD for DFM-aware quoting
One hardened steel tool quote with piece price on the same upload.