non-grinding feeder for Ultimaker
by jakob, published
OpenSCAD File is really ugly... needs a lot of cleanup...
The design has several problems:
1. Distance between gears is difficult to adjust.
2. Bolts get loose when retracting filament. I used loctite screwlock.
3. Rubber rollers were too soft and wear was too high. Replaced them by knurled steel rollers -> Maybe higher shore hardness rubber rollers would also do...
4. Added springs for better contact pressure.
5. Sometimes the variable part bends away and the gears jump over the teeth. -> Needs to be fixed by fixed by a guide on the left and right side or by a linear bearing.
6. The bowden clamp riser has a too big bore which leads to clinched filament if high pressure occurs. Don't know if this is really a problem because I used 2.2mm filament and had a clogged nozzle... -> fixed this by a aluminum part (see picture). Maybe we could also fix this by modifying the printed parts.s
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So your solution to the grinding problem is to add more contact surface between filament and bolt by adding another bolt and further reducing friction by actively driving the counter-bearing (instead of passive drive like in Bertho's design). This is cool! I had a similar idea but my intention was just to add a second drive-bolt.
This should also change the maximum force that is applied onto the filament and therefor the pressure drop over the nozzle, which in turn should increas maximum print speed. Have you testet on an increased print speed?
I am interested, because i am always working on increasing speed. Have you ever experienced the motor being choked by the filament?
I use peltier elements for pumping the heat from steppers and electronics into the heated bed. Therefore I need less energy than just using a pcb heater, my steppers run cooler and I don't need the fan for the electronics.
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- 14 bearings 618/6-2RS (6x13x5mm)
- some screws, nuts, and washers (M3, M5, M6)
- bowden clamp: thingiverse.com/thing:17027
- rubber rollers
I used these pollin.de/shop/dt/MTE0ODU1OTk-/Heimwerkerbedarf_Eisenwaren/Laufrollen_Raeder/Lauf_Transportrolle_17_mm_4_Stueck.html
and cut a M6 thread into the hole. Maybe you can get some from an old printer or copier. It should also work with a knurled wheel. The deformation shold then still be less than with stock feeder as the pressure is much lower.
I printed the parts in PLA with 30% infill. Heatbed would be useful to prevent warping but it also worked without one. The bearing holes were a bit too large and I had to use epoxy glue to fill the space. I recommend to calibrate the printer.
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