I have a bunch of Ultimaker 2+ printers with the BondTech Feeders. unfortunately, I have never been a big fan of the mounting method. if you use the default mounting method, you can't attach large spools anymore, and the smaller ones are prone to get the filament tangled. Inspired by UltiArjans Rail System where the feeder was very conventiently located, i set out to design a very crude piece. this supports 2 Feeders, places them in the back, and works like a charm. the feeder is now placed right above the spool, straightening the filament before feeding it. note : the pictures are the V1, the V2 is a bit stronger if you have heavy retractions.