Engine L4

Simple model of an engine cylinder block with piston and crankshaft. I also plan to make a model of the v8 engine based on this model, and the **best motivation is your likes**

Short video for assembly - https://youtube.com/shorts/v9T9nrXPUuU?feature=share
(I will probably make a full assembly video with all the details, but that's harder for me than modeling)

Can be printed and assembled without additional parts. Can be spun by the handle.

Can be equipped with motor, speed controller and battery (18650 with pin).

Examples of additional pieces:
- Motor - https://sl.aliexpress.ru/p?key=MGEfs4K
- RPM controller - https://sl.aliexpress.ru/p?key=bMEfshx
- Battery brackets - https://sl.aliexpress.ru/p?key=2VEfsON

Special designations in model names:
- x2 / x4 - how many copies you need to print out
- (opt) - optional part
- (repl) - part that replaces one of the default parts, usually they are called the same name

I have tried to put all the parts (stl) in the corre