MPSM Y Limit Switch Bracket

thingiverse

Human: 8-27-2017 - I needed a mount for a standard endstop, so I modified the bracket to give me some extra room. These brackets will be very tight when screwed together with M3 bolts. The standard one doesn't offer more Y space. 7-3-2017 - I modified the back of the bracket to give even more space, though I still recommend moving the cable holder to the rear bolt. Also, I measured again on the machines using this. The bracket gets moved 6mm back. I believe it's only adding 5mm of space on the x axis based on the measurements. The switch triggers just before "closed" so that's likely the reason. While repairing a parts mini, I noticed a couple of things about the Y limit switch. First, it was so close to the Y belt that the wiring for the switch was contacting the belt (this is not the case on my V2). Secondly, it was stopping the deck ~8mm forward of the Y carriage blocks, and there's an area of the build plate (where the leveling screws are) that's unusable as a result. This switch moves the bracket left and back, yielding a very small addition to the Y axis. If you're already changing the belt, pulleys, or rerouting the wiring, this isn't a bad mod but it's probably not worth disassembly unless you really need a minor Y increase. To install this, unplug the printer. Detension the Y belt (remove the spring clip, if you're still using it). I like to clip the zip tie at the back of the bed (there's more slack there), and that releases the belt. Remove the four screws holding the deck to the rods. Wrap the ends of the rod in masking tape so they don't slide out! Now, disconnect the Y limit switch wiring (unplug it), and remove the limit switch bracket. Transfer the switch to the new bracket (remember, it's on the opposite side) and attach the bracket: WARNING! The screws must be tightened ALL THE WAY DOWN, or the deck will hit them. On my V1 this worked as is. On my V2, I had to remove a washer. There may be a plastic wire loop on your stepper closest to the switch - this should rotate easily so it doesn't contact, but if necessary, you can move it to the rear of the stepper motor. Reconnect the switch, reattach the belt, rewind and tension the belt, and you're up and running with an extremely minor increase in build space along the Y axis. Turn it on, hit home, marvel at how the nozzle is now right on the edge of the build plate. There's actually more room to move the switch back, but without shifting the build plate, it's not usable, and it would only be a couple MM more. Only swapping in shorter slide bearings would make that rear space usable.