Mug LTD chamber ring Ø76 × 23 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/mug-ltd-chamber-ring/  (CC BY 4.0)
Basis: 7 mm wall so the Ø5 syringe port at x 35 still opens into the chamber; 23 tall so a 6 mm displacer travels 15 with 1 mm at each end
Catalog version: 2026-10-20

Sizes: see table below
- Ø76 bore, Ø90 outside (7 wall), 23 tall; 5 × Ø3.4 for the chamber screws on R41 and 2 × M3 tapped 2 deep in the top face at (35.5, ±20.5) for the crank pedestal's foot.
- Chamber 23 − displacer 6 = 17 free; the 15 mm stroke leaves 1 mm at the top and bottom of travel. 15 mm (7.5 throw) is the shortest stroke in the Ø3-bore crank discs whose con-rod eye (R4) clears a Ø3 shaft.

feature  size_mm
bore × height  76 × 23
outside  Ø90
displacer gap  2 radial, 1 at each end of stroke

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Atlanta Vinyl Store: Premium 11 oz sublimation mug: 3.75 in H × 3.25 in D — web — listing [verify license at link] — https://atlantavinylstore.com/products/premium-11oz-sublimation-mugs
- James R. Senft: An Introduction to Low Temperature Differential Stirling Engines — book — Moriya Press [verify license at link] — https://www.stirlingengine.com/
- Wikipedia: Stirling engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stirling_engine
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/mug-ltd-chamber-ring/index.json
API: https://xemstudio.com/api/geometry?object=mug-ltd-chamber-ring