Comment by bluGill

> Injection molding is very expensive and hard to do in the basement

You can make everything in your basement, just like you can make a 3d printer in your basement, and for similar prices. Almost nobody does it, but that doesn't mean it can't be done.

> Wood working too, requires lots of time, skills and many tools...

Skill is developed. You can do woodworking with just a sharp rock you find, no need for any more tools. Most people in woodworking choose to trade money for time and buy a lot of tools, but you can decide how far you want to go.

Time is the real constraint for everything of course. However that is my original point - if your goal isn't building a 3d printer (a fine goal) then trading money for time and buying the tools (which might or might not be a 3d printer) is probably you best bet. Assuming you have money to buy a 3d printer of course, but if you don't than a sharp rock and woodworking is probably your best hobby just because it is what you can afford.