Renkforce RF1000 NinjaFlex Filament Guide

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If you ever tried to print anything using NinjaFlex filament on a Renkforce RF1000, you know that it's not possible due to the "open" design of the extruder. The filament is not sufficiently supported, and slips off the idler wheel, bends, or otherwise won't go where it's supposed to. Print this part in PLA, unscrew the side plate with the idler wheel, put this extra part in so that the holes match up with the top two screw holes, and put the side plate back on. Make sure the machined channel in the side plate is pointing upwards when mounting the plate back on. Note that this part while inserted can interfere with the calibration process, so don't do bed calibration with it.