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Open source computer mouse by Ploopy
(lemmy.ml)
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You don't need to pay them anything.
You can just download all the files they've made available and build one yourself. The electronics have full schematics so you can either make it yourself or send the schematics to a PCB company. The shell is entirely 3d printed. All extra hardware is readily available.
If that sounds like a lot of work, maybe it's worth paying the person who created it and is offering to do all that work for you.