Printed using Kossel Mini, Marlin running on RAMPS 1.4
KISSlicer setting: 0.25mm height, 2 loops, 10% infill, speed 45mm/s (30mm/s at perimeter)
Temperature: 200oC extruder, no heat bed
Assembly require two spool holder, two 608ZZ bearing, two M8 nuts, two M8 washers, and one 8mm threaded rod (about 15cm in length).
See also http://www.thingiverse.com/thing:545898 for fitting the M8 rod on aluminium frame.