This is yet another filament guide for passing filament through materials, such as wood. An example of how it is used is shown in the photos. :)
It allows for a PTFE teflon tube and PC4-M6 fitting to be installed (http://a.co/iF4gXMz) as seen in the photos. A hole can be made in the material ("wood" - in my case) just larger than the size of the filament guide, and then the guide can insert right into the material and act as a passageway. It's imperative, in my opinion, to use a filament guide of some sort to limit the amount of debris on the filament.
I remixed this from the Ikea Lack Printer Enclosure cable guide (by LKM) and the JG Aurora A3 Filament guide (by copermen).
I'm currently using it on my Ikea Lack printer enclosure (which I haven't posted quite yet, since I'm still working on sealing the printer in).
The object will likely need to be flipped upside down; supports will print easier this way.