Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1958418.
Who has had issues already with the GT2 pulleys on Y and X? I did! I replaced these small bearings already several times and decided to finish that by using large ones. In this design I used F625ZZ (16mm x 5mm with flange). I mounted them both on a 25mm long 5mm bolt with flanges to the outside (see pictures). What did I need : 2 pulleys for the Y-axis. New supports for the Y-steppers (I wanted to get rid of the the whole melamine piece under both Y-belt channels - no worries about the length of the rods : see picture) Supports for the cablechain on the right side.
Whats special about the pulleys : while still warm, I screw the bolt in and create as such a thread that holds quite good The LEFT X-pulley : 2 pieces now. I made a separate support for the bearing to allow nicer and more accurate printing One could also mount the Y-pulley supports upside down and leave the melamine base.
I replaced the bed support by an aluminium one made of standard 2mm thick profiles.
Modified cablechain support items : 50mm instead of 60mm Everything mounted and tested ...
See http://www.thingiverse.com/thing:2045169 for a revised version. In the revision belt tension adjustment is done with the pulley instead of the stepper