Piston Engine inline 4 model

I made an inline 4 engine working model, it can be turned by the crank wheel in the back and pistons are moving acordingly. is more like an aesthetic project rather than functional still, it got potential to be much more if one has enough patience. It can be electrified with coils in the upper piston part and made to do real work but that requires patience and time i didn't yet have. I uploaded the main block ( 2 pieces) , the crankshaft, 4-piece lever+piston asembly which will be printed 4 times, and back closing pieces. the cooling propeller works if connected with a runber band.Of course, some parts might require light additional finishing and filing. The washers are made optionally to set distance in the main rod. The version printed by me is an older version of this updated model