Twin Piston Engine Model STL, 3D Print Mechanical Crank Toy, Kinetic Desk Model, Digital Download

A fully original, self-engineered twin-piston engine model designed from scratch, not a remix of any existing file. Turn the crank and watch both pistons reciprocate through the cylinder bores in real time, a genuine working mechanism you can display or actually operate by hand.

This is a display and demonstration model, not a functioning combustion engine. No batteries, motors, or electronics required, just precision-printed parts and a hand crank.

What you get:

• Individual STL files for each part (any printer, any bed size)

• Complete_Plate.3mf, all parts pre-oriented on one build plate, ready to slice

• Bonus G-code file, fully pre-sliced with supports included, ready to print directly if you own a Creality Ender 3 V3 KE or similar 0.4mm nozzle printer

• Full assembly and print settings guide (PDF)

Print details:

• Total print time: approximately 6 hours on a Creality Ender 3 V3 KE

• Recommended material: PETG for moving parts (pistons, connecting rods, crankshaft, pin) for durability under repeated motion; PLA for static parts (block, crankcase cover, base) for crisp cosmetic detail

• Nozzle: 0.4mm standard

• Supports required on piston and cylinder bore overhangs (not included in the STL/3MF files, enable in your own slicer; already included in the bonus gcode)

• Pin included as a printed part in the files, no separate hardware to source

Skill level: Intermediate. Support removal and light assembly required, full step-by-step guide included.

This is a digital file listing. No physical item will be shipped, you will receive download files only after purchase.

Terms of use: This is an original design. For personal, non-commercial use only. Do not resell, redistribute, or reupload these files.