CR10s Dual Z axis Coupler / Tensioner for GT2 Belt

thingiverse

I have a CR-10S (dual Z steppers). This thing is a GT2 Belt Tensioner I made for linking the two Z axis lead screws together to prevent them from getting offset. I assume this would also work on CR-10 printers with the single stepper. Background Info I had an issue where the bracket on the Z-carriage crashed into the stepper motor on the right side (facing the printer). See attached photo. I am using a mirror tile for a printing surface and it is a bit thinner than the stock glass. I figure that contributed to the issue. I printed an adjustable Z stop and raised up the bed and the bracket now always clears. Still, I would occasionally get an offset by bumping something with the motors off, removing a part, etc. I thought it would be good to link the two lead screws. I wanted to keep it simple, so I used the stock lead screws and put a pulley at the top of each lead screw, just under the mount. I got a closed loop timing belt and designed this simple tensioner. It takes a little off the maximum print height (I have never printed anything that requires the full 400mm). Parts Required Pulleys (x2) for the Lead Screws (GT2-6, 40 tooth, 8mm bore): https://www.amazon.com/gp/product/B01H94CJ3U Closed loop GT2-6 timing belt (848mm length / 424 tooth). https://www.amazon.com/gp/product/B018JJV2B4 Idlers (x2) (GT2-6, toothless 16 tooth, 3mm bore): https://www.amazon.com/gp/product/B075Q4YGYS Pulley for the tensioner (GT2-6, 20 tooth, 3mm bore): https://www.amazon.com/gp/product/B07BPKWM9D Misc Hardware: M3 x 30 socket head screws (x3) M3 flat washer (x12) M3 nut (x3) M3 Ny-loc nut (x3) I updated the model to provide some additional adjustment. The part pictured is before the update. I have included versions with and without the Generation 3 Engineering logos. I have printed a couple parts with the setup. So far, so good. Update - 15 Jan 2019 - This is working great! I no longer have to level the bed before every print. I wish I had done this long ago.