Joints

How lib/joints.scad mates two parts through their mount slots, and what each joint exports.

lib/joints.scad mates two parts through their mount slots in five ways:

• fused — plain attach(), one body.
• bolted — a flange on each side on a shared 4-hole pattern (insert bore one side, clearance hole the other).
• snap — barbed pegs one side, matching holes the other.
• pin — a 4.8 mm bored flange on each side and a real BitBeam pin as a third body.
• screwed — for a part that already carries Mechanism's DeckMate three-hole pattern (deckmate/outie, deckmate/universal): at most one generated flange with heat-set insert bores at that spacing, on whichever side has no holes. Lets a DeckMate rail print in its own best orientation and be fastened on.

Every non-fused joint exposes one part= tag per printable body, so each exports to its own STL.