Rigid Drag Knife Holder for Prusa i3

Features:

Built for a Prusa i3 Mk3 for cutting vinyl stickers. (May work for other i3 revisions as well.)

Uses and tested with pictured "Roland Cutting Knife" holder, though others should also work since the original mounting system was used for reference. 

Only requires replacing two screws that hold on the Noctua cooling fan with ones that are 5mm longer (20mm and 25mm in my case).

Sits as close as possible to the nozzle without altering your build volume. 

Will not flex or detach when cutting thick or sticky material (i.e. vinyl stickers).

Tips:

Print with support. Use a pick and/or x-acto to clean out the alignment slot. Use two zip ties to keep the knife holder in place. Ensure knife holder is fully seated in its cradle (no gap). ~0.2mm of clearance is provided. 

When not using the drag knife, depress the eject button and remove the blade. The body of the knife holder will be about 2mm above the plane of the printer nozzle (just like your PRINDA Probe).

Get one of those tacky cutting mats and cut it to size on your printer for best results.