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Can I buy pieces somewhere without buying a printer?

Perhaps you are not familiar with it but you can literally order just about any part in any material online.

Several business that used to print PCB's also do 3d printing at very competitive rates.

I won't advertise names but it's easily found online. You simple upload a stl file, select a material and that's kind of it.

Some other comments have mentioned that the CC-BY-NC-SA license on this (and similar projects) makes using such services legally questionable, since that technically counts as the sort of "commercial use" the license prohibits.

This also means that the "Open Source" in the title is incorrect.

Check your local library or makerspace. Our local libraries will let you send a file to them and they will 3d print it and charge you the cost of the materials.

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