QUBD extruder mod
by mickb, published
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I'm curious which drive gear you were using. I changed over to Bart's design some months ago and recently had exactly the problem you describe. So I created a new one of these and completely solved it, just the opposite of what you experienced. I'm using an MK7 gear and the 608ZZ0 bearing. The first thing I noticed was that the bearing turns when I run the motor WITHOUT any filament in it, meaning that the bearing is running up against the MK7 body face (you can't get closer than that!). Also, I had to recalibrate the flowrate - turning the Slic3r Extrusion multiplier down from 1.18 to .94 (that's how bad the bdring was slipping due to the arm running into the ridge on the stepper). I've got 18 hours on this new setup and no buildup on the gear teeth yet running ABS at 100mm/sec @ 225 degrees.
I tried milling the heat-sink's 5mm hole out to 9mm. That helped just a little, so I abandoned it. The real change was using heat-sink compound between the heat-sink and the mounting bracket and the barrel threads into the mounting bracket to increase heat transfer to the heat sink. Then, for PLA I adjusted the retraction down to 0.5mm at 22mm speed. With those two modification, plus this mod or the one by dbring, and an MK7 gear, I have printed over 1,000 hours of PLA with the QU-BD MBE extruder with not a single gear strip or plugged extruder. I print PLA at 70mm perimeters and 100mm infill @ 200C. The only time I use ABS anymore is for a piece subject to heat, like this mod.
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