PTFE guide tube holder for Wanhao Duplicator i3

I needed a solid guide tube holder for my Wanhao Duplicator i3 and all the other designs here weren't up to par.

The design is based on the assumption that you don't have your filament spool mounted on top of the printer but somewhere else instead. In my case, I have several spools on a shelf above. Ergo, it doesn't extend too far back. It's designed for 4mm OD tubes.

If you want to use this holder you have to tap the M3-hole and you will also need an appropriate length M3 screw (why not