Boxer-Engine KeyRing

KeyRing of a combustion boxer-engine with turning crankshaft and moving pistons.In this design the pistons of each opposed pair of cylinders move inwards and outwards at the same time. Like all BMW boxer engines.PrintingNo supports.I printed with PLA+, layer height 0.15 mm.Assembly- Use some oil or grease between moving parts for a smooth operation.- Build the crankshaft using the crankshaft alignment tool. Apply glue. I use Loctite Super Glue-3 Power Gel. Attention for the orientation of the pi