Toroidal Piston Engine and 2 Speed Gearbox

thingiverse

I've crafted a 2-cylinder engine paired with a 2-speed transmission. Although the actual print is pending, I've successfully created an engine model inspired by a similar design that operates flawlessly. If you're interested in printing this, I've intentionally designed it to be assembled using 12 and 8 mm long M2 screws, two 53 mm long metal rods with a diameter of 2 mm each, one 4 mm rod, and seven bearings measuring 7 mm wide, 22 mm outer diameter, and 8 mm inner diameter - standard skateboard bearing specifications. My plan is to have this printed and rectify any malfunctioning parts as needed.