Boxer / Flat-Four Engine

thingiverse

Designed this as a birthday gift for a mechanic. Simple model to demonstrate the way a flat engine works. Crankshaft might be a bit fragile when turning. Don't tighten the screws too much, since there might be some friction between the pistons and the cylinders. Let me know how the Connections work out for you and I might upload a customizable model to adjust tolerances between parts. I printed all the moving parts with black filament and the housing with Velleman's Neutral, which is somewhat transparent. This way you can see the movement of the engine. Post-Printing 1. Surface treatment I'm not familiar with chemical surface treatment, but I simply sanded my parts to achieve smooth gliding of the pistons 2. Assembly Just snap the connecting rods onto the crankshaft and the pistons. Place everything into one half of the housing and carefully put the second half on top. Try turning the crankshaft. Mount the housing using two M3x16 screws (or similar length). Make sure you tighten them just as much as you're still able to turn the crankshaft.