Get an aluminum small pully, and sand down the big gear to make it smaller.Īdd some ridges to keep the belt in line, maybe with loops of copper wire or adding thin discs to each side, assuming that does not mess up the hobbed bolt spacing. I should mention anyone could retrofit a typical gregs extruder to belt. No more of that, perfect reliability now. My pla plastic gear kept getting soft from the motor heat, then deforming and slipping as the set bolt hole elongated. They are quieter, have no backlash, and allow you to use an aluminum gear on the stepper motor. I bet others could improve this, and then belt driven extruders could be the norm. I was worried the rubber would split or shred from the thread stress. The point is, it can be done with cheap materials and is durable. There could be 20 variations of this, including gluing the belt, then sewing it. I have printed for 20 hours so far with no sign of degredation from the seam, and no stretching issues. Once you have a stitch or two going, its easier as the belt stays in place. Its very hard to push the needle through, so use the pliars to do that, then pull from the other side with pliars. Wax the thread to keep it from tangling too much. I used a metal thimble on one hand, and needle nose pliers in the other. It is rather fine work, and I justs did what i might call looping stitches like a spiral notebook, nothing tecnical. It seems like a better idea to do a skewed joint, so more length to sew along, but lining up the teeth is impossible. So each side is 1/2 tooth, and sewing them together forms a whole tooth. I found that the best workflow was to cut the belt right in the middle of a tooth, so not a skew joint, straight accross. So I got out some really fine thread from my trout "fly tying" materials, and tried a couple stitches. I got some nylon thread, and tried using that to put a couple stiches through some scrap belt. I then thought of sewing the loop together, and got out my sewing kit (ok, my wife's), and found a nice fine quilting needle.
So I needed one, and tried gluing with neoprene glue. I think it would have been done like that from the beginning if it were not for difficulty of getting closed loop belts of any size. I wanted to make the extruder motor turn the big gear attached to the hobbed bolt run via belt, not gear. I have a reprap Prusa I3, but this applies to any situation where a closed loop belt would be nice.
0 kommentar(er)
