Cross lap joint (cross halving) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/cross-lap-joint/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design — geometry computed in the generator from traditional proportions
Catalog version: 2026-10-20

Overall (mm): length 80.0, width 80.0, height 20.0
- Woodworking joint drawn for 3D printing: the parts lock together by shape, so a print can be joined without glue or screws. Drawn at true size with the parts line to line (zero gap) in their assembled position — add your printer's fit allowance to the mating faces (your AI or slicer can do this).
- Two members cross flush: each is notched to half its depth across the other's width.
- Print both parts notch up; the notch floors are flat tops, so no supports are needed.

dimension  value
stock  20 × 20 mm square
parts  part a, part b
notch width  20 mm (the other member's width)
notch depth  10 mm on each part
assembles  B drops onto A from above
holds  both members against sliding along each other

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Xem Studio: Joinery design (geometry computed in the generator from traditional proportions) — web — Xem Studio design — https://xemstudio.com/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/cross-lap-joint/index.json
API: https://xemstudio.com/api/geometry?object=cross-lap-joint