Does anyone know of an igus reference with a smaller tolerance? I would like to buy some tighter plastic bushings than the ones I used on my delta printer (RJMP-01-08 igus drylin bushings) as I was negatively surprised by the amount of free play they give to my carriers (just like in this video: less than ideal to say the least!).
They state 0,00-0,04 mm for a RJMP-01-08, which I found to be optimistic … until I read it: “The specified tolerance adjusts itself after press fit into housing bore.”. These are no good with 3D -printed carriages 
http://www.igus.eu/wpck/7188/DryLin__R__RJMP?C=DE&L=en
I think there are other families, but e.g. the RSM-12-14 seems even more sloppy than the RJMP-01-12
https://www.youtube.com/attribution_link?a=0QT1XMgEbbI&u=%2Fwatch%3Fv%3Df0BXxGPwoZA%26feature%3Dshare
IIRC they’re meant to be pressed into a carrier of some sort, which would tighten them.
@ThantiK thanks. I just stumbled upon @Mike_Miller informative post at https://metaprintr.wordpress.com/igus-and-igentus-a-sliding-parts-review/ where he also makes it explicit.
What I did on my delta is to pinch the bushings but it never was enough imho. So I will try to print closed loops and press-fit them (this is for the new printer, 12 mm shafts).
Actually he may not like them so much in the end given https://plus.google.com/u/0/+MikeMiller0/posts/NnL1T5j9kBA My goal is to try and be very quiet, but I would not sacrifice quality for noise 
There are versions of this kind of bushings with either reduced tolerance or with metall housing. If you are not sure, what to buy, call IGUS, they do great support.
+Peter van der Walt no way 
Too bulky. Now don’t get me wrong: I was an early bird on their kickstarter years ago: good stuff indeed.
+Peter van der Walt sizewise, I would better try to print “tunable” carriages directly with the tribo-filament igus gave me
Just for general information, Igus has a page dedicated to 3D printing. http://www.igus.com/wpck/11685/3Dprinting?C=US&L=en Looks like I want the “drylin R” bushings (0,030-0,088mm). Let me try these (no way I can call them right now).
Don’t Igus do a printing filament for printing bearings. then print some of these. http://www.thingiverse.com/thing:906972
@Michael_Scholtz yep what I was joking with. I have some, but I can’t be “hardcore reprap” on this machine
@Oystein_Krog I just can’t find my way on igus website and never found it!
Too late I just placed my order with something completely different (in addition to cheap WLM bushings): WS-10-40 rails with WJ200UM-01-10 and WJ200UM-01-10LL
Will keep this reference for my next purchase though, thanks! 
Saw down one side of the bushings to split it. Then install in your split housing, tighten to adjust. Alternatively, put set-screws in your housing to crimp and hold the igus.
@Mark_Fuller heretic thought I did not want to have 
No more heretic when a few more people think alike… My delta carriages had set-screws but they were not bulky enough to tighten them (would have been to the point the PLA would crack). And it may work better with a full split around the bushing, not like what I did (I could only tightened at one point). Thanks anyway
For the record, I had reasonably good experience with IGUS…they are, in fact, a maintenance free, zero wear solution. There are plenty of professional companies that use them in their print solutions (Aleph’s TAZ series being an outstanding example).
They’re quiet, and ‘relatively’ inexpensive, and the aluminum ceramic coated rods have substantially less weight to throw around when compared to hardened steel.
That said, there is a certain size of round object that I just couldn’t get to print round…and while other folks are leaping for the brass ring of making rapid prototyping more rapid, I was happy with sacrificing speed for precision.
And every few months or so, I need to relubricate the sintered bronze stuff and the printers return to their expected quality…I never had to do that with IGUS.
I designed parts for the Taz5 that can be printed with the IGUS filament.
I did this after discovering the same amount of play you found.
The article is here that shows all the parts and pictures - http://www.matterhackers.com/articles/dual-extrusion-and-printable-upgrades
The parts are all available for download as well.
I’ve been very happy with the results thus far (5+ months of use since the swap)
Oh, and to be more clear, the parts are free
@Taylor_Landry great review (and the first I know of actually). I still have mine that dates back to Fabcon2014, in its original packaging! It makes sense to me when space is an issue, but the geometry of 3D printed stuff is far from perfect compared to a machined/molded industrial part…
@Jeremie_Francois Oh, of course, but it’s actually pretty easy to get these printed bearings to work extremely well. There are certain things I don’t think should ever be printed on a machine, but I was very pleasantly surprised with the results of these parts. So much so that I designed similar parts for Prusa i3s.
Also, bearings can get pretty pricey, so having a good reprap option is definitely a plus in my book.
Please do report back on your findings with the parts you ordered. I’m a big IGUS fan in general, and it’s always good to get real world feedback on parts in the wild.