It is working very well so far with my bowden setup, though I had to fing a shorter grub screw as the initial one jammed on the top of the base plate above the idler bearing.
Edit: After a couple of weeks I ran into issues with friction. I'd printed the B'Struder in PLA, and apparently there was enough heat generated at the entrance to the arm just past the gear for the PLA filament being run through the extruder to melt a little, and it plastic-welded itself into the arm. I'm assuming that heat was due to friction from fast retractions... I'd like to reprint the arm with the filament channel widened to 4mm so that it will take some 4mm OD/2mm ID bowden tube in the arm sections, to remove that PLA-on-PLA sliding friction.