Prusa i3 MK2 Clone Extruder for 8/12/18 mm sensors and MK8 Hobbed Pulley
by geoffsim, published
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Modified Prusa MK2 extruder parts to fit 8, 12 and 18mm sensors, and the MK8 hobbed pulley.
12 July 2017: 12 and 18mm sensor mountings have been modified to provide more space for the sensor cable routing.
I have included the modified scad files, as required by the GPL license.
Note that these files may require additional files, which can be found in the Prusa GIT repository.
Whilst waiting for my genuine Prusa i3 MK2 to arrive, and having been spurred on by Tom Sanladerer's Cheap i3 MK2 Clone videos, I went ahead and built my own 24V version of a Prusa i3 MK2 Clone using the STLs freely available on Prusa's GIT repository; a 6mm Aluminium frame; TR8x8 Z axis screws; a Hictop 3mm Aluminium heated bed; a 360W 24V PSU; and a genuine E3Dv6.
However, it became clear (and pointed out by Tom in a summary video) that the common MK8 extruder did not fit well onto the current design. I took to modifying the SCAD files to fix this issue, and a few others, and this is the result.
- Move hot-end 1mm right to accommodate the MK8 7mm effective diameter.
- Increase sensor fixing to hold the more common 12mm and 18mm sensors.
- Allow the sensor cable loop to fit without interference.
The 8mm sensor is approximately 21.5mm right and 9mm back from the nozzle.
The 12mm sensor is approximately 27mm right and 7mm back from the nozzle.
The 18mm sensor is approximately 32mm right and 3mm back from the nozzle.
Print in ABS 0.4mm nozzle; 0.2mm height; 2 shells; 3 layers top and bottom; 25% infill.
As I wanted a look-alike clone, I also modified the PSU cover to take a 24V 360W PSU, and the RAMBO cover to take a RAMPS 1.4/Arduino combo. These are posted seperately.
The last two pictures shows the completed clone and some sample printed parts. Running TMC2100 stepper drivers on the X and Y axes has made my machine almost silent!
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Prusa i3 MK2 Clone Extruder for 8/12/18 mm sensors and MK8 Hobbed Pulley by geoffsim is licensed under the GNU - GPL license.
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