PET bottle linear bushing

Hi there
I have been thinking on and off about how to make simple linear bushings from plastic and just a few days ago i started my experiment by drilling out a nylon rod with pretty good results. My brief investigation of the matter suggested that PET is a far better material to use though so I have been thinking back and forth on how to use PET plastic cut from bottles as a liner(?).
As a quick experiment I cut a strip out of a bottle and pushed it into a nut slightly bigger inner diameter than my 6mm stainless steel rod that is going to be used for my richrap 3DR build. I just picked it at random out of a box full of assorted nuts and bolts but M8 is a good guess. This setup seems to work remarkably well as is and even better with a dab of oil. I even managed to design in adjustable preload by cutting the strip slightly tapered so by pushing or pulling it either against or with the taper you can adjust slop vs friction. The PET strip showed no sign of trying to slip out of the nut so it seems the threading alone might be enough to secure the plastic. Have this been tried before and I missed it or am I on to something? As I don´t yet have a reprap I can not make any comparison with LMnUU´s or similar but as it is so simple to try maybe someone here could help me compare this setup with linear bearings? It might be repstrap worthy anyway.

Looks like an interesting trick to me. You might like some of the discussion in this thread: DIY linear bearings (no PLA), although your method is much simpler.

I think PET strips from bottles might work really well as living hinges in compliant mechanisms, such as this or this.

You could also use PET strips for a double lamina compliant joint (DLCJ) like this one, but I am wondering a bit off topic here...

Yes, uGens threads have been great inspiration for me. I should have acknowleged him/her in my first post because that´s where I got the information about PET. Thank you uGen. I hope to see some follow up on how it went with that setup. I see an issue in the no PLA thread design that I want to work further with. My gut feeling says that block is to rigid. 3D printers have relatively small loads on them so I think a bushing with just enough preload will be the way to go because if the part is rigid you have to maschine it with great precision. One way to do it would be to make one half of that block thin enough to introduce give, but still, I think you have to maschine them in a CNC router to get the grooves parallel. I want to come up with a way to make them with hand tools and if you cant´t make them perfect you can introduce flex at the right places to compensate. When I get my machine together I hope to investigate this further and in the meantime continue speculation. I have been thinking on a printed carriage that you just slip in a liner like this as a replaceable adjustable slide surface.

Would anybody like to share their oppinions on how much play is acceptable in your bearings or bushings? None att all? The LMnUU bearings, do they slide on their own due to gravity and still have no play at all?
Thanks