3UP printer, been working on a few mods, but this thing is great. Working on conversion to COREXY, using some of the Eclipse3d designs.
What extruder are you using?
I went a little pricey, running a B3inovations Innovations Pico 1.75, and a Mark VII bowden style mounted for a direct drive, 500 degree heater cartridge. Usually run a .35 zozzle, at 150mm/s, no zbanding issues.