Anet E12; Z-axis sync screws and run on one stepper motor and reduce bed leveling.

thingiverse

I remixed the design to work with the E12 and to improve upon it. 1. tightening only on one side of the belt can cause issues with turning the lead screws in opposite directions thus causing the heights to change from left to right, one will go up, and the other will go down. My design tightens on both sides of the timing belt. 2. Since mine tightens on both sides at once, it engages more of the teeth on the pulleys on the lead screws; this helps to make it possible to run off one z-axis stepper motor. 3. A knob to adjust the tension as needed. Parts that will be needed: <img src="https://images-na.ssl-images-amazon.com/images/I/61uBpktXgdL._SL1000_.jpg" width="25%" height="25%" title="GT2 Timing Pulleys 40 Tooth 2GT Synchronous Wheel Parts Bore 8mm Aluminium Gear Teeth Width 6mm"/> <a href="https://www.amazon.com/gp/product/B076Y6BXDH/">GT2 Timing Pulleys 40 Tooth 2GT Synchronous Wheel Parts Bore 8mm Aluminium Gear Teeth Width 6mm | need 2; come in a pack of 2</a> <img src="https://images-na.ssl-images-amazon.com/images/I/51r6sD00sqL._SL1000_.jpg" width="25%" height="25%" title="GT2 Driver Belt 860-2GT-6 Timing Belt in Closed Loop Rubber L=860mm W=6mm 430 Teeth"/> <a href="https://www.amazon.com/gp/product/B018JEWBSC/">GT2 Driver Belt 860-2GT-6 Timing Belt in Closed Loop Rubber L=860mm W=6mm 430 Teeth | need 1; come in a pack of 2 </a> If yours is a E10, CR10; this belt will not work due to being too long. If you find a belt that will work on yours, then please post a comment with the belt that works for yours.</p> <img src="https://images-na.ssl-images-amazon.com/images/I/61mcxwdWUYL._SL1332_.jpg" width="25%" height="25%" title="Idlers GT2-6, toothless, 3mm bore"/> <a href="https://www.amazon.com/gp/product/B075Q4YGYS/">Idlers GT2-6, toothless, 3mm bore | need 4; come in a pack of 5</a> <img src="https://images-na.ssl-images-amazon.com/images/I/61FoXor6rkL._SL1500_.jpg" width="25%" height="25%" title="Idler Pulley 20 Teeth 3mm Bore 6mm width Timing Pulley Wheel Aluminum"/> <a href="https://www.amazon.com/gp/product/B07BPKWM9D/">Idler Pulley 20 Teeth 3mm Bore 6mm width Timing Pulley Wheel Aluminum | need 2; come in a pack of 5</a> Misc Hardware: M4 x 40 Button Head Hex Socket Cap Screws (x1) M4 Nylon locking nut (x1) M3 x 30 socket head screws (x6) M3 x 12 socket head screws (x3) M3 Nylon locking nut (x6) M2 x 16 socket head screws (x2) M2 x 20 socket head screws (x2) Rail mounting screws & t-nuts (x2) Print one of each of the parts. Some assembly is required, I printed this in fewer parts for my prototype, but had some issues due to layer direction and broke at the slider, superglue was required. See photo for assembly. After getting the z-sync installed, we need to correct the heights across the x-axis rail: 1. Use your jog controls to home X, Y, Z, the do Z home a second time, I have found that my E12 will do a quick Z home (end up about 1mm high) then the 2nd it will do a very slow Z home (this is the one you want). <table style="width:100%"> <tr> <th>Fast Z home</th> <th>2nd Z home [slow]</th> </tr> <tr> <td><img src="https://cdn.thingiverse.com/renders/6f/f8/9a/e7/6a/d235d054fd2623416cc185ee82baf7e9_preview_featured.jpg" title="Quick Z Home"/></td> <td><img src="https://cdn.thingiverse.com/renders/da/6e/06/b4/7c/5ba26a0779c7376ab080d91892a329af_preview_featured.jpg" title="2nd slow Z home"/></td> </tr> </table> 2. Jog the X-axis out about 10mm. 3. On the X-limit switch side of the printer; Use the calipers depth rod to get the height from the rail down to the metal part of the horizontal support below. Lock the depth using the set screw on the calipers. Now move over the other side, see if it is close enough. 4. if the readings are not close enough then loosen the set screws for the stepper to lead screw coupler <b>(only the ones for the lead screw)</b> and the timing pulley on top of the lead screw. 5. Adjust the hight by twisting the lead screw while making sure you don't turn the stepper motor or the other lead screw by via the sync. 6. After getting the heights close enough, then re-tighten the set screws for the stepper to lead screw coupler and the timing pulley. 7. Jog you z-axis up 10mm or more than then do X home, Y home, Z home and then one more Z-home. Jog the x-axis out 10mm then retake the x-rail measurements. Now be happy.