Simon's hex coupler
by Wired1, published
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Nice to see this design still being popular. I'm beginning on an i3 for .35/.25mm printing. I believe these will work, but the i3 uses thinner X threaded rods so I'll be making an adjustment to these. :-) Keep up the good work.
Ah yes my bad. I used some M8 nuts that came from the States with my first printer, a Mendel Prusa kit, and it came with these 'thin' M8 nuts.
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3 perimeters, 3 layers, 0.35 nozzle, 0.25mm layer height, 25% infill at 90 degrees fill angle.
Motor end is printed at 5mm so clean it out with a 5mm drill.
Threaded rod end is printed at 9mm so should be a comfortable fit as it comes off the printer.
M8 nut fits inside the open end of the hex coupler.
Run another M8 nut up from below with a washer and tighten it as much as you dare.
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