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The SCAD file has some flaws if set for MK7 gear and 3mm:

  • 4th hole for Nema17 is now covered, make it useless hole.
  • The idler plate is more smaller = more weaker design. Bad design.
  • The hole above idler plate is broken (open side), MK8 has it closed.
  • The splitted idler v2 is broken. It has unwanted parts.

I must say, this is not correct automatic build in SCAD. You can move idler a bit up for MK7 / 3mm, but SCAD keep it in same place and that has some issues in idler design.

Please rebuild SCAD script to avoid weakness in idler design when using 3mm/MK7. Make sure everything is correct build.
It's nice you have option in script for 3mm filament, but it causes some build flaws.

Compact extruder is nice, less parts. But you have not tested properly script for build 3mm/MK7 and checked on strength idler / good and clean idler parts.