Koshikake kama tsugi (lapped gooseneck splice) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/koshikake-kama-tsugi-lapped-gooseneck-splice/  (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 130.0, 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).
- The gooseneck splice with a seat — used for sills and beams that need a strong lengthwise lock.

dimension  value
stock  20 × 20 mm square
parts  male, female
gooseneck  6 mm neck, 14 → 10 mm head, upper 14 mm
seat  6 mm ledge
assembles  drops in from above onto the seat
holds  pulling apart lengthwise; the seat carries the load

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/koshikake-kama-tsugi-lapped-gooseneck-splice/index.json
API: https://xemstudio.com/api/geometry?object=koshikake-kama-tsugi-lapped-gooseneck-splice