PG35L Micro Extruder V4 - For J-Head
by UltiBots, published
Go to ultibots.com for Hobbed Drive Gears and Bearings. MendelMax 1.5+ kits and printed parts are available for purchase.
Alibre PE source files included.
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Check out http://www.thingiverse.com/thi.... It is still untested but should provide better shaft support.
I would recommend pulling the motor from the body, turn down the pot counter clockwise, then make incremental micro turns clockwise, pinch the hobbed drive gear, then run the stepper 10mm at 100mm/sec in Pronterface. Keep making the micro adjustments until holding the drive gear becomes difficult. I have found too much amperage to the stepper is problematic.
Regarding motor shaft wobble, our production printers have been running almost daily for months without issue. Our retract is set to 15mm/sec and we are using RAMPS 1.4 with A4988 stepper motor driver using 24 volts input.
Thanks for trying our design. I hope this helps - Brad
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M3x40 bolts and M3 jam nuts for the idler (x2)
M3x25 bolts and M3 jam nuts for the motor mount (x2)
605ZZ bearings for internal and idler (x2)
M5x20 bolts and M5 jam nuts for the bearings (x2)
M5 washers (x4)
M4-10 bolts and M4 jam nuts to secure to x-carriage (x2)
You will need to remove and drill out the support layers on the idler and body.
Try our gear puller:
This extruder works well with AlephObjects Supa-Flat X-Carriage
The bearing holders shown are:
thingiverse.com/thing:15205, the last one on the download list.
01/10/13 - Added brimmless STL. Also has better internal breakaway supports.
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