Filament guide

When I print with PETG or TPU I print directly from a dryer box. This dryer box is normally placed next to the printer (see pictures). To guide the filament as stress free as possible you need some type of guiding system. There are already several filament guides here and in the internet. However I wanted one as high as possible and mountable on the printer itself. Therefore I created this guide roller that can be mounted on the spool holder for the Prusa MK3-4.

I used a standard 608 roller bearing. If you don't have one you can print this model https://www.printables.com/model/70024-parametric-roller-and-slide-bearing .

After printing you likely have to polish the surfaces of the threads and the ball a bit for smooth operation.
In both halves of the fork that holds the bearing there are 3 small holes. Here you can insert a small, 3 mm, piece of filament to align the fork when you screw it in.

Assembly is pretty straightforward. Push the “wheel” over the ball bearing. This i