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Hi CaptainX / Manuel,
You can adapt this extruder design for your MK7 style drive gear easily by changing according parameters in the OpenSCAD file. A few minutes ago I uploaded a new version of the file, which is now further optimized for using a MK7 drive gear. Just download and install OpenSCAD, open the .scad file and change the drive gear parameters. Compile the design and export your STL for slicing...
The following parameters should work for your drive gear:
// drive gear
drive_gear_outer_radius = 12.00 / 2;
drive_gear_hobbed_radius = 11.00 / 2;
drive_gear_hobbed_offset = 3;
drive_gear_length = 11;
drive_gear_tooth_depth = 0.2;
I'm looking forward to hearing from you.