Geeetech I3 pro 8mm Acrylic X, Y pully guide
thingiverse
When the X, Y pulley are not perfectly centered, the belt slowly drifts to one side until it becomes stuck and printing comes to an abrupt halt. Update: I've discovered a ball bearing that fits the printer belt with precision. http://www.banggood.com/GT2-Synchronous-Wheel-3MM-Without-Teeth-For-3D-Printer-Accessories-p-1013245.html?p=9R09143243493201512Z You will need two M3x20mm screws from bag #27 and two hex lock nuts from bag #13, which are M3 in size. Since the printer bag doesn't have enough of these parts, you can also purchase them at: http://www.banggood.com/10pcs-Carbon-Steel-Self-Locking-Hex-Nut-Nylon-Insert-Lock-Nut-M2M2_5M3M4M5M6M8-p-1007119.html?p=9R09143243493201512Z Select M3 for the best results. It works flawlessly.
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