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Bayonet twist-lock joint

Name: Bayonet twist-lock joint dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How do you make a 3D printed bayonet mount? · Hardware · basis: Xem Studio design — geometry computed in the generator from traditional proportions

Also called: bayonet mount, bayonet connector, twist lock 3d print, bayonet joint, quarter turn lock, bayonet lid, cierre de bayoneta, conector bayoneta, Bajonettverschluss, Bajonettverbindung

Exact dimensions. True size, with no printing tolerance added.

length: 40.0 mm
width: 40.0 mm
height: 30.0 mm

Notes

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).
Push and twist: pins on the plug run down the straight part of the L slots and lock in the short turn — lids, lens mounts, quick-release fittings, vacuum and dust ports.

Bayonet twist-lock joint size chart

dimension	value
stock	Ø40 socket, Ø32 plug
parts	socket, plug
pins	three, Ø4 mm, 120° apart
slot	12 mm straight entry, then a 30° turn
assembles	push in, turn 30° to lock
holds	pulling apart; turn back to release

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Xem Studio

Joinery design (geometry computed in the generator from traditional proportions)

web

Xem Studio design

Free files

★ Free files 3 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json

bayonet-twist-lock-joint-socket	Socket tube Ø40 / Ø32 bore with three L-shaped slots	STEP · STL
bayonet-twist-lock-joint-plug	Plug Ø32 with three Ø4 pins (shown locked, turned 30°)	STEP · STL
bayonet-twist-lock-joint-assembled	All parts in their assembled position (each part its own solid)	STEP · STL

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=bayonet-twist-lock-joint