Filament guide for passing through a material (such as wood)

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 gui