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No switches or keycaps included
The perfect macropad does not exist. there are uses for even a 1x1 macropad.
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it depends on the situation. >

Now I'm picturing a setup with 1 button boards that have contacts on all 4 sides and can be assembled into a(n)x(n) size macro pad >

I thought of that, a case on wich you can put whatever you want, knobs, buttons, sliders ecc.
But i don't know how they could communicate with each other and for my first project i want to make things simpler, maybe in the future >

Im looking for an affordable barebones wireless numbpad/6 key macropad and its seemingly impossible >

What do you mean with barebones