If you want commercial license, check out my bio and get it from Patreon.

So, this design is for trophy contest. I just pull some of my work in the past to start with. I have piston, rod, and connecting rod.

I was wantted to have some assembly elements in this design. So you can put some of the bolts and part together. But it end up the bolts are too small, also if you are printing with silk filament. The bolts will not have enough strength. so, I turn it into semi assembly.

Made some change.

Get more detail:

Here we go:

From this:

To this:

But, if you want the full assmebly version, wait for my update.

You could still adjust the piston position: