QUBD extruder mod
by mickb, published
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There appears to be a small problem with this design, the inside edge of the lever, just underneath the bearing, is fouling against the ridge on the center of the stepper, which means there is a tiny gap that you cant close between the drive wheel and the bearing. Its probably not an issue in most cases, but i have some particularly thin filament (1.63 mm) and its slipping. I was able to fix it by shaving off a small amount along that edge with a craft knife, but it might be a good idea to put a small inset about 1.5mm high along that bottom edge, if you make the top a curve, you wont need support material to print it. alternatively, shift the pole for the bearing forward by a small amount, so the bearing is closer in.
the fan/heat-sink cools the cold end of the extruder, and prevents heat creeping up the hot-end from softening the filament before it goes into the hot-end barrel, which causes jams. this design actually could do with more cooling, I'm experimenting with drilling holes in the heat-sink, to allow some direct cold air draft from the fan to circulate around the filament driver gear and the motor shaft, which is another source of heat. I'm also looking at substituting a 65 cfm fan which would significantly improve cooling.
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