Keyed mitre joint (feather keys) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/keyed-mitre-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).
- Thin keys across the outside corner of a mitre (as on picture frames) lock it and show as stripes.

dimension  value
stock  20 × 20 mm square
parts  part a, part b, key 1, key 2
mitre  45°
keys  two, 2.5 mm thick, 12 mm legs, across the outside corner
assembles  close the mitre, slide the keys into the kerfs
holds  the mitre against opening

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, 5 parts): https://xemstudio.com/files/hardware/keyed-mitre-joint/index.json
API: https://xemstudio.com/api/geometry?object=keyed-mitre-joint