Craft sticks, skewers, coat-hanger and paper-clip wire, BBs, marbles, ping-pong balls, zip ties — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/sticks-skewers-wire-bbs/  (CC BY 4.0)
Basis: Common consumer sizes (craft stick 4.5 in, skewer 12 in, No. 1 paper clip, .177 BB, 6 mm airsoft, 16 mm marble, ITTF 40 mm ball); wire gauges measured
Catalog version: 2026-10-20

Sizes: see table below
- Craft (popsicle) stick 114 × 10 × 2 mm; jumbo 150 × 18 × 2. Bamboo skewer Ø3 × 300 (Ø2.5 × 200 and Ø4 × 400 exist). Coat-hanger wire Ø2.0 mm (1.9–2.3, mild steel). Paper clip Ø1.0 mm (No. 1), jumbo Ø1.2. Welding rod / TIG filler Ø1.6 and 2.4 if you want straight stock.
- Balls: steel BB Ø4.5 mm (.177), airsoft Ø6.0 (5.95 ±0.01, surprisingly round: fine as 6 mm bearing balls in a printed race), glass marble Ø16 (15.9), shooter Ø25, ping-pong ball Ø40.0 × 0.4 wall (a 2.7 g hollow sphere: the lightest displacer you can buy).
- Zip ties: 2.5 × 1.0, 3.6 × 1.2, 4.8 × 1.3, 7.6 × 1.8 mm cross-sections; a printed slot of width + 0.3 mm holds them. Uses on the can engine: skewer as crankshaft (in Ø3.2 printed bushings), coat-hanger wire as crank pins and con-rods (bend a Z), craft sticks as frame, BBs as low-friction displacer-rod guides, zip ties as hose clamps.

item  size_mm  note
craft stick  114 × 10 × 2  jumbo 150 × 18 × 2
bamboo skewer  Ø3 × 300  Ø2.5 / Ø4 also
coat-hanger wire  Ø2.0  1.9–2.3 by maker
paper clip wire  Ø1.0  jumbo Ø1.2
steel BB  Ø4.5  .177 cal
airsoft BB  Ø6.0  ±0.01
marble  Ø16  shooter Ø25
ping-pong ball  Ø40.0 × 0.4 wall  2.7 g
zip tie  4.8 × 1.3  2.5/3.6/7.6 wide

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Craft stick — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Craft_stick
- Wikipedia: BB gun — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/BB_gun
- Wikipedia: Table tennis — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Table_tennis
- 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, 10 parts): https://xemstudio.com/files/hardware/sticks-skewers-wire-bbs/index.json
API: https://xemstudio.com/api/geometry?object=sticks-skewers-wire-bbs