Plain scarf joint (1:4) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/plain-scarf-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 200.0, 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).
- Joins two members end to end along a long sloped face. 1:8 to 1:12 is used for structural glued scarfs; 1:4 keeps the part short.

dimension  value
stock  20 × 20 mm square
parts  part a, part b
slope  1:4 (80 mm long in 20 mm stock)
assembles  faces together, glued or bolted
holds  only with glue or fasteners

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