Syringe cradle for 10, 20 and 60 mL barrels — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/syringe-cradle/  (CC BY 4.0)
Basis: Saddle drawn at the barrel OD of the plastic-syringes entries (10 mL Ø15.9, 20 mL Ø21.0, 60 mL Ø29.0); M3 clearance Ø3.4
Catalog version: 2026-10-20

Sizes: see table below
- A 40 mm long block with a half-round saddle at the syringe barrel OD exactly (fit: socket): Ø15.9 for 10 mL, Ø21.0 for 20 mL, Ø29.0 for 60 mL.
- The saddle axis lies on the block's top face, so the block is barrel OD + 14 wide and half the barrel OD + 4 tall.
- Four Ø3.4 holes at x ±14 and y ±(OD/2 + 3.5) take M3 screws from the saddle face into the frame; at that spacing the screw heads clear the barrel.

file  barrel OD  length  width  height
syringe-cradle-10ml  15.9  40  29.9  11.95
syringe-cradle-20ml  21.0  40  35.0  14.5
syringe-cradle-60ml  29.0  40  43.0  18.5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Stirling engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stirling_engine
- Long Earth Society: Can engine build — video, web — LES site — https://longearthsociety.com/engineering/
- Long Earth Society: Engine builds (videos and write-ups) — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/syringe-cradle/index.json
API: https://xemstudio.com/api/geometry?object=syringe-cradle