Xem Studiomeasured geometryAlpha V-twin, two 10 mL syringes
Two syringes in a 90° V on one crank pin: the alpha with no displacer, checked so the pistons stay in and the rods clear.
stroke 16 · rod 60 · 2.6 mL per cylinder · 90° phase from the V · Ø100 nut flywheel
18 parts, every one a file here · all printed STL URLs · Markdown · tick lines as you go (saved in this browser)
| subsystem | object | parts | qty | note | |
|---|---|---|---|---|---|
| Frame | Alpha V-twin frame for two 10 mL syringe | alpha-frame-10ml STEP · STL | 1 | print on its back; both barrel axes pass through the crank axis | |
| Crank disc | Alpha V-twin frame for two 10 mL syringe | alpha-crank-disc-s16 STEP · STL | 1 | ONE pin: the 90° V gives the 90° phase | |
| Con-rods | Alpha V-twin frame for two 10 mL syringe | alpha-conrod-60 STEP · STL | 2 | 60 mm so they clear the barrel walls | |
| Pistons | Syringe pistons | syringe-piston-10ml-f008 STEP · STL | 2 | replace the plungers; lap into the barrels, run dry | |
| Cylinders | Plastic syringes 1–60 mL as pistons and | syringe-10ml STEP · STL | 2 | barrels only. | |
| Crankshaft | Stirling shafts and rods | crankshaft-5x80-dflat STEP · STL | 1 | print flat side down, 100 % infill | |
| Bearings | Ball bearings | bearing-625 STEP · STL | 2 | both ends of the boss | |
| Crank pin | Stirling shafts and rods | pin-3x20 STEP · STL | 1 | pressed 6 mm into the disc. | |
| Spacers | Stirling shafts and rods | spacer-5mm-t2 STEP · STL spacer-3mm-t1 STEP · STL | 1 | 2 mm boss-to-disc on the shaft; 1 mm disc-rod and rod-rod on the pin | |
| Pin collar | Shafts | collar-3mm STEP · STL | 1 | keeps rod 2 on the pin | |
| Piston pins | Dowel pins | dowel-3x12 STEP · STL | 2 | through each piston fork | |
| Flywheel | Nut-weighted flywheels | flywheel-100-m8-b5 STEP · STL | 1 | behind the boss; 12 M8 nuts, remove until it still carries | |
| Flywheel weights | Nut-weighted flywheels | nut-m8 STEP · STL | 12 | remove until it still carries | |
| Transfer | Alpha V-twin | transfer-tee-4mm STEP · STL | 1 | between the syringe tips; regenerator plug of #100 mesh in the tee | |
| Tube | Silicone and PU tube | silicone-tube-4x6-50 STEP · STL | 1 | keep it short | |
| Mount | Aluminium T-slot extrusion | 2020-100 STEP · STL | 1 | foot: 2 × M5 at 50 mm; frame at the rail's end so the flywheel hangs clear | |
| Heat | Tea lights | tea-light-38x16 STEP · STL | 1 | under the hot barrel's tip end |
Build order
- Print the frame, crank disc, two con-rods, two syringe pistons, crankshaft, pin, spacers, flywheel, transfer tee.
- Lap each piston into its barrel until it sinks slowly with the tip open; no oil.
- Press the 625s into the boss; shaft through with the 2 mm spacer; crank disc on its D-flat, grub tight.
- Pin into the disc; 1 mm spacer, rod 1 (to the +45° socket), 1 mm spacer, rod 2; 3 mm collar on the pin end.
- Pistons onto the rods with the 3 × 12 dowels; slide the barrels over the pistons from the crank side, tip outward, flange against the socket; pinch screws.
- Tee with a mesh plug between the tips on short silicone tube; flywheel on the back of the shaft.
- Heat the hot barrel's tip end; 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 every part.