This is a remix of http://www.thingiverse.com/thing:1070481
REQUIRED, 4 x 608ZZ type bearings
I made a few changes. First, I added legs for free standing use. I made some visual design changes and I changed the rollers. The rollers now have a 5mm seat for the bearings so they won't go too far in.
The bearings are a tight fit on to the posts. Also, the rollers are a tight fit on to the bearings. A little sand paper made everything slip on but still maintained the snug fit I was looking for (I didn't want it falling apart with a larger/heavier roll on it).
See my clip-on filament guide for the FLUX Delta here http://www.thingiverse.com/thing:1588795
I printed mine at 220c. That's just what my printer happens to like with the filament I use.