Anet A8 z-axis Synchronize with 1 or 2 Motors

thingiverse

This is a modification of the Anet A8 printer frames to synchronize the 2 z-Axis motors. This is an update of the Anet A8 Z Redux - Synchronized motors by uanCarlos_3design http://www.thingiverse.com/thing:2097301 I had ongoing z-axis syncing probelms between the left and right sides. Re-wiring the two z-axis motors in series helped but did not solve the problem. Finally I tried neoxM3's frames but my z-axis screws were too short. My rework Since the z-axis screws were too short to extend above the previous one piece frame plates, I split each plate into 2 components to lower the front half to allow the rods to extend high enough to connect the pulleys. Even with this I had to extend the rods further by pulling each out of the flex collar as far as possible, And pull the collars up from the motor shafts are far as possible. With this design the right motor is no longer needed but can left attached. The pulleys on the left side are designed so the belt wraps around the geared pulley over 80%. The rear pulley sits in a slot in the frame so it can be adjusted to balance the belt's tension. I find the belt does not need to be very tight if both motors are attached. After I took the photos I extended the slot under bearing "D." This gives more range for setting the belt tightness. Parts needed: "A" 2 qty-8mm gt2 geared pulleys "B,C,D" 6 qty-623ZZ 3x10x4mm Ball Bearings Shielded Radial Bearings. 3M screws and top and bottom washers so bearing rotate freely. *C" 1 qty-3D printed guide pully "E" 2 qty-7mm x 3mm ID standoff washers (3D print yourself) "E" 2 qty-Rod hold downs (printed or ANET original) "F" 2 qty-KFL08 8mm Mounted Block Cast Housing Self-aligning Pillow Bearing DT 4M screws and nuts 1 qty-Closed Loop 852 to 860mm x 6mm Width GT2 Timing Belt 8 qty- 3M screws to join the 2 halfs using the pre-hreaded holes. (I scrape hand soap onto the threads to make screwing easier).