Xem Studiomeasured geometryLTD coffee-cup engine
Runs on a cup of coffee: wide thin displacer, tiny piston.
Ø100 chamber · Ø96 × 8 foam displacer at 6 mm · 10 mL syringe at 5 mm · 1–3 Hz on 15–20 K
5 printed parts · 6 bought lines · all printed STL URLs · Markdown · tick lines as you go (saved in this browser)
| subsystem | object | parts | qty | note | ||
|---|---|---|---|---|---|---|
| Plates | LTD (low-temperature differential | ltd-100-bottom-plate-template STEP · STL ltd-100-top-plate-syringe STEP · STL | 1 | buy | bottom plate in 2 mm aluminium | |
| Chamber | LTD (low-temperature differential | ltd-100-chamber-ring-h16 STEP · STL | 1 | silicone seal | ||
| Displacer | LTD (low-temperature differential | ltd-100-displacer-foam-template STEP · STL | 1 | EVA foam | ||
| Guide + rod | Hobby brass tube (K&S) | brass-3-32in STEP · STL brass-2mm STEP · STL | 1 | buy | ||
| Power piston | Plastic syringes 1–60 mL as pistons and | syringe-10ml STEP · STL | 1 | buy | ||
| Stands | LTD (low-temperature differential | ltd-crank-stand-pair STEP · STL | 2 | |||
| Bearings | Ball bearings | bearing-623 STEP · STL | 4 | buy | ||
| Crank | Crank discs | crank-disc-stroke10 STEP · STL conrod-40 STEP · STL | 2 | drill the pins at 3 and 2.5 mm | ||
| Shaft | Shafts | shaft-5x100 STEP · STL | 1 | buy | ||
| Flywheel | CDs | cd-dvd-120 STEP · STL | 1 | buy | + hub-cd-15-to-5 |
Build order
- Print ring, top plate, stands, templates; cut a 2 mm aluminium bottom plate from the template.
- Foam displacer on a 2 mm rod through the 3/32 in guide.
- Ring on the plates with silicone; syringe in the socket.
- Crank stands, Ø5 shaft, tiny crank discs 90° apart; CD flywheel.
- Set on a hot cup; flick the flywheel.
Agents: each row's object has /api/geometry?object=slug and the MCP tool get_free_files; the STL list above is the whole print job.