Chainable baseplates for MAX7219.
4x plates fit Makerbot Thing-o-matic (ie. 100x100 build platform).
Short is about 2mm thick on the baseplate - probably shouldn't go much thinner. Tall is 3mm.
"edge" plate contains beginning and end pieces. 4x edge includes 2 middle pieces as well.
Sand edges to square them up (if necessary).
Mount Max7219 with 3mm bolts.
Connect to MCU.
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