Snap-fit (cantilever)

A tapered spring arm with a tip barb, plus a catch to latch into.

A cantilever snap-fit is a flexible arm with a barb near its tip. It inserts along the arm’s length: as it slides into a slot the barb is pushed flat, then springs back out sideways once it clears the wall, and the barb’s back face catches the edge of an opening so the arm can’t pull out. The red "Cut window" is a cutting tool, not a finished part — position it on your own mating wall at the latch point and subtract it, so the barb has an opening to snap into. Choose "Mated keeper" instead to get a solid strike-plate already positioned in the latched state, which makes the engagement easy to see. For round parts, use the annular snap instead.

1. Set the beam length, width, and thickness, plus the barb height and latch gap.
2. Pick a catch style — Cut window (a subtract tool for your own wall) or Mated keeper (a ready demo pair).
3. Generate: the arm (and catch) drop in as editable parts.