Anycubic Mega Zero - Y belt tensioner

thingiverse

Hi, So I was looking for belt tensioners for my Anycubic Mega Zero and I couldn't find any so I designed one during a free hour at work. The base part has two pins that slide into the two existing bolt holes. These pins are not super strong and they don't need to be because they are not load/ force bearing. They are just used to position and orientate the base part so it is properly aligned with the belt. The base part is compact and low enough to have sufficient clearance with the printer bed. Installation is straight forward and easy to do: 1. First assemble the Carrier and Knob part as explained in https://www.thingiverse.com/thing:2789837 The best is to use a M5x35mm hex bolt and a standard M5 nut. 2. Remove the base part with the Y-pulley from the Mega Zero. 3. Disassemble the Y-pully and transfer it to the Carrier part. Note that instead of the provided M5 bolt, a M5 hex bolt is to be used. The head of the hex bolt sits flush within the Carrier part and the Base part is closed at the bottom so that a) the bolt cannot just fall out and b) because the bolt head does not protrude at the bottom you can tighten the belt much further back because there is no interference with the frame. 3. Place the Base part onto/ into the frame of the Mega Zero. 4. Insert the Carrier part into the Base part and attach the knob. 5. Tighten the belt by turning the knob. This belt tensioner together with the X-belt tensioner https://www.thingiverse.com/thing:3270228 made the quality of my prints much better. For using this X-belt tensioner, you must remove the X endstop first, but you can place it back with the left over materials from the replacement with the X-belt tensioner. Please check the photos of my setup https://imgur.com/a/XIiccGg As you can see in the photos the X endstop is not parallel to the frame anymore, but that doesn't matter. You can just use one bolt and fixate it. I hope you can have some benefit of this as well so please enjoy it. Please let me know your thoughts. **Update 14-10-2020: Appearantly the Y-belt slips upwards when you print large objects and when the print bed moves to it's extremities. To prevent this from happening, I've made a flange on the Carriage part to prevent the belt from slipping and getting damaged. I had to update the Frame part for it as well.** **Update 23-10-2020 => Rev03: I encountered the problem that when tightening the belt too much, the frame part tends to tilt and causes a misalignment resulting in the belt being damaged (top edge frays). After several tests I found the solution! The frame part now fits very tightly onto the frame and the elongated wall prevents it from tilting. Also added a M3 bolt hole at the back so that you can even use a T-nut to bolt the frame part to the frame of the Mega Zero. I did not need that, but left it there just in case.** **Update 24-11-2020: I bought some teethed pulleys to replace the smooth timing pulleys on the X and Y belts, but I ordered the wrong size; too big. If you want to see how I adjusted the X an Y tensioner to compensate for the larger pulleys or if you want to give me advice on whether teethed pulleys are worse or better than smooth pulleys or if you want to have a good laugh and see if my prints will become worse, please check out this post in the Mega Zero group: https://www.thingiverse.com/groups/anycubic-mega-zero/forums/general/topic:48770**