I noticed yesterday, residue building up on the linear rods from fumes.
The PBC frelons are smearing the residue on the rods inhibiting the glide. Need to clean. The drylins help overcome that.

Drylin installation is critical for the tolerances. Something you cant get from prints.
I printed one online carriage for drylin use, 8hrs ?, and whomever designed it left things out or were not correct.
Then I became skeptical of the alignment, trashed it and used the stock DaV carriage . The frelons slip right in and had zero play on the rods.

The drylins are about the same price as oilite bearings, another good point.
The frelons were $7.70 ea w/shipping. About 40hrs. use, so far.
Hope I made the correct choice because that was the last time Im doing a full tear down.

They are meant to press fit into a 16 mm hole (the carriage has 16.5 mm holes as the hole is slightly undersized when printed)
I might have gone with the others if I had seen them.

I might have to give the pbc ones a try for the y axis have you been using them and do you like them?

As you can see in this picture the front x motion transfer rod doesn't have much distance between it and the stepper.

On my previous carriage that I was using I had the z height increased to hold the stepper at the right height. However that makes the stepper run into the x axis rod before I get the end of the y print area.

The loss of y travel affects me a lot more the Z

oh and if you want you can print the Igus IGUS RJMP 01 08 style bushings. ( I bought the real thing)
however there are versions that you can print on thingiverse

http://www.thingiverse.com/thing:24990
http://www.thingiverse.com/thing:91389
http://www.thingiverse.com/thing:1412399

I have not made any of those

I can I just need to track down the original maker of the  base I used so I can give attribution. it is a creative commons license so I can remix it under the license just fine but I do have to give recognition.

Once I do that ill post it up and provide the link here

I will also include the z stop extender I created and printed

If you are able to modify the carriage any, the part that holds the stepper motor you can increase the height by you say 29mm and that way you will get your z height back.  When I did my carriage that's what I did.

Once I do that ill post it up and provide the link here

I will also include the z stop extender I created and printed

I printed a 20 mm circle and got 20.00 on the y and 20.03 on the x and 20.02, 20.01 on the xy diagonals

The top surface is really smooth.

I also regain all my y distance travel that I had to restrict using the hack I was using to get it to fit
the only con is I do lose some z travel 29 mm to be exact but I think its worth it

Now I just need to remove the daughter pcb and clean up the wiring.
oh yah and design a new layer fan