This is a "clamp-on-extrusion-and-fasten-with-bolts" type filament guide for my MendelMax. Very easy and simple design. I personally use it without screws and bolts, because it clamps quite well anyway.

The guide itself is open on one side, so you don't have to take out the filament if you put it in place. I taped it in place together with the isolation wool.

Just print and use.