At first i was a bit afraid of the loop constraining the filament to much. However i've been able to print nGen Flex and PETG without
issues doing multi-hour prints. Very reliable, awesome. Minimalism at its best.
Printed a customized OnShape Version tagged with hBp:
#gap = 0.6
#diam_hobbed_gear = 7.6
Although i use a MK8 hobbed gear the available MK8 version did not work for me (the filament was barely touched by the bearings).
MANY thanks to @mmemetea for fully open-sourcing the thing as proper CAD model @onshape!