S2M20 Toothed Drive roller
Description
This is an updated version of the X & Y replacement drive roller I made for my CTC A10S. The original model worked well for me for many months before I received my aluminium replacement rollers from China. The reason I updated this model is because while the original printed fine for me using the standard .2mm resolution, it could not be printed at .1mm without using supports, which would make a mess of such a tiny design. This model prints in 2 pieces that snap, and should optimally be glued together. Since this part gets heavy use, especially when used for the Y axis motor, I recommend a resolution of .1mm and 100% infill density. Further, if you're using a printer that came with nylon drive rollers, you should print these before the originals become wallowed out. My CTC printer shipped with nylon rollers, and the Y axis roller came flopping in the wind. The indication I saw in print was that the 20mm test block printed nearly 2 mm short on the Y axis, and one of my first models, a knob for my oscilloscope, printed in the shape of an oval rather than round. To print my original replacement, I had to wedge a piece of paper between the flat on the shaft and the flat inner face of the roller. This roller was designed to replace the nylon rollers that came with my ultra-cheap CTC A10S, Creality CR-10 clone printer. Creality uses aluminium rollers with set screws, and for good reason. I recommend replacing plastic rollers with aluminium for durability. That said, I used these printed replacements for several months without incident, and noticed no visible wear when I removed them to install the aluminium ones. These rollers may work as replacements for many other models of 3D printers. I hope somebody finds them useful.
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