Plastic parts

The PLASTIC tab has a small enclosure subset:

• Boss (plastic.boss): screw bosses with a hole, fillets and optional ribs.
• Lip / Groove (plastic.lip): the mating lip and groove along a shell’s opening.
• Snap Fit (plastic.snap_fit): a cantilever snap hook and its catch.
• Rest (plastic.rest): a pad for a part to rest on.
• Plastic Rules (plastic.manage_rules, plastic.assign_rule): wall thickness, draft and clearance per material, used as the features’ defaults.

Rib and web (on the SOLID tab) complete the set. These features are checked against hand-computed geometry rather than a Fusion oracle.