I bought these for $25 at a yard sale. I don’t know anything about 3D printing but always wanted to get into it. Did I buy junk or parts wise am I ok? Where would I get replacement parts for what’s missing/damaged. How would you suggest testing these? What program? Do they require some kind of prep before the test? Sorry for all the noob questions.

I can’t micro solder but I am mechanically inclined enough to replace basic parts if I need to.

TIA!