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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.