Half lap joint (corner) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/half-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 60.0, width 60.0, 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).
- Each member is cut to half its thickness over one stock width, so the corner is flush on both faces.
- For a 3D print, print both parts flat (lap face up) and pin the corner with a Ø3–5 mm pin or a screw if it must not lift.

dimension  value
stock  20 × 20 mm square
parts  part a, part b
lap length  20 mm (one stock width)
lap depth  10 mm (half the thickness) on each part
assembles  B drops onto A from above
holds  racking in the plane of the frame; needs a pin or screw against lifting

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/half-lap-joint/index.json
API: https://xemstudio.com/api/geometry?object=half-lap-joint