u have a cool topic but is very expensive

3D Printing
,
1

u have a cool topic but is very expensive

2

Doesn’t have to be. You can get printers down to 200$

3

It’s a hobby, you can spend as much, or as little as you like with it. No different then any other really.

4

I’ve gotten some of the - although already cheap - material cost back from printing stuff for people.