Filament Guide for Up! with Integral Filament Cleaner

Having gone through a nasty nozzle clog or two I don't want to ever have to repeat the experience if I can help it. This Thing helps reduce the probability of a clog due to dust etc. by passing the filament through a small chunk of open-cell foam. The foam is held inside the Thing so that you don't have to deal with a loose piece of foam every time you change filament.

Rather than offset the guide to the spool's edge as is often done, I designed this guide to mount on the spool's centerline a