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My local library also offers a thermal camera rental! I've borrowed one several times, it's very useful!
Nice! Having the free 3D printer access has been really useful for us on more than one occasion. We have no need to purchase one, but maybe once every six months, we might need to replace a part to something we can just 3D print and it's been great.
You just have to slowly start printing all the pieces for your own ~~Von Neumann probe~~ printer
A 3D-printed Analytical Engine! That's much cooler than a teapot or a tugboat.
There are several designs for (partially) 3d printed printers.
The original RepRap was one, and Prusa printers have quite a few 3d printed components. Aside from the electronics, hot end, motors, screws, and aluminum frame, that's entirely possible.
Obviously that's still a lot you need to buy, but probably over half the actual parts are printable.
As someone with only a casual interest in 3d printing, are the open source 3d printers worth the effort it takes to make them vs buying one?
It's like anything else. There are super high quality mass produced printers for like $200, so if you want to make some prints for the lowest cost possible, that's the way to go.
If you want a hobby about learning and tweaking the printer itself, then yup, the open source printers are really good and fun to work with.
If you want to make super strong, high quality prints for prototyping, or industrial applications, then you're probably going to need to get a serious, real manufactured printer.
The nice thing about 3d printing, is that there's options for anyone's interest level.