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Or in short "DDGRRFHEBEFHWRF" 8D
One can never have enough 3D-printers, so I decided to build some Huxleys.
A lot of parts didn't fit or needed some improvements, so I ended up redesigning most of the machine.
Here's the result for the driver/extruder combination and a GRRF 3mm hotend ( https://shop.germanreprap.com/de/Modular-Hot-End-3mm ).
Hotend and bowden can easily be removed by only one or two screws.
The fan is detachable, which comes in handy during machine calibration or to have better sight on the first printed layers.
The design has gone through many changes, but now it works like a charm.
For the protocol:
I am in no way affiliated to GRRF and just a customer who bought some stuff from them...
ASSEMBLING THE DRIVER:
ASSEMBLING THE "EXTRUDER":
The other end of the PTFE tube can now be mounted to the driver.
This requires another 25mm screw.
ASSEMBLING THE FAN HOLDER:
Reduce the motor current to a minimum.
If it gets hot it will melt and bend the plastic parts!
Good stepper parameter starting point:
Retraction settings starting point:
BOM (hopefully complete):
1 x GRRF 3mm hotend, https://grrf.de/de/catalog/grrf-modular-hot-end
1 x NEMA17 stepper motor
1 x MK7 drive gear
1 x 623 ball bearing, (3x10x4)mm
1 x spring; (6x30)mm; d=0.81; appr.: >30-50N at 17mm
1 x (6x4)mm PTFE tube, 60cm length
2 x M6 nut
1 x fan, (50x10)mm
6 x zip-ties, standard 3.0mm width
2 x 3mm washer, large
3 x 3mm locking nut
4 x (3x16)mm screw
4 x (3x25)mm screw
4 x (3x30)mm screw
2 x (3x35)mm screw
11 x 3mm nuts
? x 3mm washer, small and thin (ball bearing and arm fixture)
ÃÂ ÃÂ - removed double "GRRF" position from the BOM
Direct Drive 3mm-GRRF-Hotend Bowden Extruder for Huxley (with removable fan ;-) by FMMT666 is licensed under the Creative Commons - Attribution - Share Alike license.
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