Makergear M2 Optical Endstop Mount

thingiverse

Human: Swaps mechanical switch Z endstop - This endstop is supremely crucial to get great bed adhesion. I believe the original mechanical switch one was not as repeatable as this optical one has proven to be. You can find the optical switch on Ebay, search for "Slot Type Optical Coupling" they are around $1.5 each. The pinout is usually printed on the back, DO is the digital out which you connect to the original switch signal lead, AO is analog out that you can leave unconnected. I straightened the header pins upwards so I could get it closer to the top plate, they were at 90deg. The Makergear M2 (at least my version) had an LED indicator mounted next to the switch, this LED had its Anode (+) connected to one side of the switch and its Cathode (-) to the Anode wire which goes back to VCC on the PCB. This wire was then left unconnected to any part of the optical switch, The common ground from the switch and LED is then connected to the optical switch GND. - Your's could be wired differently though so please check with a multimeter before hooking up. Optical endstop - requires recompiling Marlin firmware to invert the Z end stop sensor signal - or inverting the signal with a NOT gate if you don't like to recompile things. For Marlin firmware, the relevant setting is: const bool Z_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop For best results use this along with my constant nut tension device:http://www.thingiverse.com/thing:973075/ Youtube video covering my various Makergear M2 mods: https://youtu.be/jD6ZTcCd0j8 By - http://www.easybotics.com/ And - http://hilo90mhz.com/