[GRBL Laser Cutter] Solve random limit switch triggering with DIY cable shielding 

Electrical interference was causing spooky limit switch triggers on my DIY laser cutter driven by GRBL flashed to an Arduino Uno. Problem solved with cable shielding (aluminum foil and electrical tape).
00:00 - Problem description
00:18 - Problem origin
00:33 - Cable shielding
00:55 - Longer video