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Thanks for posting your settings. Yes, one of the four holes is covered too much to be usable, but some people reported three holes to be enough to hold the stepper motor.

If you cannot see the second part of the idler v2, please try to disable idler v1 by using //
// translate([20, 0, 0])
// idler_608_v1();
One part of idler v2 has exact the same position as idler v1 and therefore is covered by its "ancestor".

The whole extruder hasn't been designed for these large combination of MK7 and 3mm filament due to being compact was a main goal.

I'm looking forward to seeing your remix suitable for MK7 and 3mm filament.