First up on Metaprintr: My experiences with +Igus sliding parts.
http://metaprintr.wordpress.com/igus-and-igentus-a-sliding-parts-review/
Great writeup. Look forward to seeing more musings.
I was waiting til I had a spare moment, a place to publish it, and was sure enough of the results to post 'em.
Really glad you’ve been so successful! If you’re having any problems feel free to give us a call! Happy Holidays!
I wonder what the difference between Drylin and Delrin is…
Delrin can be 3d printed and I plan to experiment with 3d printed Delrin bushings/slides(printed-in-place bushings, anyone?
on stainless rods and would be interested to compare them to this sort of product.
Delrin is awesomely slick. The issues you’ll find will be designing parts specific to delrin’s qualities. The thin IGUS bushings needes two in each axis, with a little seperation between them, whereas metal linear bearings don’t. Further, it’s easy to buy a precision bar and a precision bushing, but quite a bit harder to 3-d print a bushing to similar tolerances. You may be better off making the bushing undersized and drilling (or honeing, more properly) to the proper diameter.
I was planing on trying these: https://www.thingiverse.com/thing:91389 or https://www.thingiverse.com/thing:97041
With a bit of oil they seem to be good on stainless even with PLA. With Delrin they should be great.
It would also be nice to see designs like the i3 rely less on ‘hard to get locally’ parts like bushings and I’m curious to see how they perform. And compare them to nylon(easy to get but not as slippery).
I’m eager to hear your findings! I’ll be migrating from IGUS on my carriage to oil-sintered bronze in the hope of improving my round objects (which you’d need to do to accurately print a bushing/bearing). I’ve used some Taulmann Nylon that seemed pretty slick, though not as much as Delrin
I’ve also got some oil-sintered bronze bushings that I was planing on using, before discovering the right kind of ‘semi-fluid’ grease that made the original roller bearings behave as they should.
However I will be printing out some delrin parts for ‘the big green delta’ and will make some of these bushings as part of my test prints. I also suspect they’ll work well on ‘damaged’ stainless shafts much better than other options.
I hope your experiences with your Delta are better than mine. I could never fully remove the drag of the u-joints, which caused all kinds of problems.
The biggest problem we are having is simple lack of experiance.
The effector/carriages are based on this:
The later model, with balls-on-stick and held together with springs. It’s very solid and the only downside is if you ‘over extend’ it tends to self-destruct. 
Right now the parts are ABS, but once we are happy(There’s some changes to be made), the final ‘socket’ parts will be all Delrin.