Finger splice joint (finger joint for lengthening) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/finger-splice-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 140.0, width 20.0, 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).
- Tapered interlocking fingers join two members end to end — how long lumber is made from short pieces.

dimension  value
stock  20 × 20 mm square
parts  part a, part b
fingers  4 across the width, 20 mm long, tapered
assembles  pushed together end to end
holds  with glue; huge glue area in a short length

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