The mouse has two channels, i.e. X and Y. So far only X is used, but it can be easily extended with an additional channel, handy for those have dual-extrudes. Just print and assemble anther sensor body and make a small circuit board to transplant the IR emitter and receiver to the 2nd sensor body. The software is capable of reading the Y axis already, just need to add some extra lines of code and maybe the Reset to make it work.
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