Yes PETG is much more suitable for this part as it will be exposed to the continuous heat of the extruder motor and PLA can soften in those conditions, although it should hold for some time, not sure how long though
The defects you have on the printed part are due to not printing it in the correct orientation, the files are already pre-oriented and should be printed as is. Also I recommend printing at 0.1mm layer height to properly print the small
There are two files on the Zip file available above, one is the normal one, the other a mirrored one, the mirror part is meant for E2, the normal part is meant for E1.
I don't have any instruction on how to assemble it but, it should be relatively straight forward as is replaces a already existing part and tou,to install it you need to:
- Remove the extruder motor from the machine
- Remove the metal PTFE block and filament sensor from the motor
- Unscrew the arm with the spring (Hex 2.5)
- Carefully remove the arm and the spring storing both for later, be careful as the arm has a small bronze bushing around the screw, do not lose it
- Unscrew the bottom black part (Hex 2.0)
- Replace the black part with your 3d printed part
- Screw the new part in place with the screw that used to hold on to the black part (Hex 2.0)
- (The trickiest part as it takes some strength) Re-install both the spring and the lever as the spring is quite stiff this can take a few tries to get into place
- Insert the brass insert until it is inside the black lever and inside the 3d printed part, then tighten it back up with the lever screw, if the screw doesn't go in,your brass insert is incorrectly positioned (didn't go down far enough).