Hello guys, I came up with an idea to make a bushing what I felt needed to be tested, this must have been tested before but I couldn’t find anything about it. (bad googling skills I suspect)
However, I thought it might be worth sharing.
https://youtu.be/xed1q1yYr7g
Is the petg better than a pure PLA bushing (which yes, have been used for several years, but have a rather short lifespan). really like the idea BTW 
@Ashley_Webster Yes, I know that printed bushings is no news.
This is just a proof of concept for combining easy to print PLA with a filament more resistant to wear. Ideally the contact material would be POM or igus tribo filament or something like that but I just grabbed what I had for this test.
@Peter_Hertel The idea was to use more wear resistant material as contact material. (I believe PET-G is better wear wise but probably not the best)
Yeah, and it’s a great idea! Good work. Can you get ptfe in 3mm filament form?
I dont know, but I guess Igus tribo filament would be awesome for this.
@Ashley_Webster I could be wrong, I remember reading somewhere (I think it was the reprap forums) a discussion about material properties for use with linear bearings, I believe they mentioned PET having good properties for this kind of application but there could be difference between between pure PET and PET-G in this respect of course. There are better material choices for sure.
@Peter_Hertel Well, there is 4mm PTFE tubing (I use it for the bowden tube) I think it would be fairly easy to do this with PTFE tubing instead of filament. (Would not have as many contact areas but would probably work.)
Someone with leet openSCAD skills could probably fairly easy do a parametric model for using different size filament/materials, rod size and housing dimensions.
@Ashley_Webster I don’t take it as criticism, I welcome discussions.
BTW I also had a stab at making a OpenSCAD parametric model, I havent tested printing anything from it yet but it looks ok.
https://drive.google.com/file/d/0B-xBE70A26rWbk5aX005OHpzaVU/view?usp=sharing
@Peter_Hertel I made a 4mm PTFE tube bushing test today with the openSCAD model I shared in the comment above, it works ok, it has more friction then the PETG version but that is probably because its a tube and it deforms a little when pushed into the slots putting more pressure on the rod. It could probably work a bit better if I tweaked the parameters a little (extrusion width is probably a little bit off.)