@Oliver_Schonrock I have never seen a reason to switch. The bronze is silent compared to ball bearings. Self align. Support the carriage at the outer most edges. Require no maintenance or lubrication.
I am sure bearings have a lower coefficient of friction, but the bushings have worked well for me so far.
@Dat_Chu is right. Hot swapping carriage would be nice, @Eclsnowman . Also some modifications to make the head modular (eg. install spindle or laser). My last whish is, that there will be files for linear bearings and sliding bearings (eg. igus).
@Isaac_Arciaga my stl’s should be able to be a drop in replacement for the ones by @Jason_Smith . The difference would be my new carriage which also requires my new bed supports. I haven’t finalized that design yet to push to github. If you want those for now see my G+ post and google drive link.
@Florian_Schutte Jason made a modified version of my carriage designed for linear bearings. I am also working on modifying the duct for him so it could be used on a volcano (longer due to the vertical heat block).
But changing that blew up my solidworks mates so I haven’t got that done yet.