This is a very simple, very basic filament spool roller/stand. However it's not 3D printed, but laser cut. Laser cutting is just so much faster and cleaner :)
Design uses common 608 skate bearings for easy rolling. Main stand body is laser cut from 1/4" (6mm) acrylic but you can probably use thinner 1/8" (3mm) acrylic as well, just adjust screw lengths accordingly.

Each "leg" (you will need to make two) of stand consists of:

• two laser cut wall pieces (1/4" or 1/8" acrylic)
• two 608 Bearings
• two M8x25 machine screws (5/16" screws of similar length will also work)
• two M8 nuts (or use 5/16" if you are using 5/16" screws)
• four thin washers (laser cut from 1/16" acrylic, or use metal ones if you have them)

Washers must be as thin as possible because bearing is sandwiched between them, and gap shouldn't be big enough for spool to fall into it. I cut mine from very thin 1/16" acrylic (1.5mm), however you can use regular metal M8 or 5/16" washer as long as it's not too wide (it should not touch bearings outer ring).

Assembly:
Cut all parts (for both legs), peel off film if any.
Insert M8 screws into one of leg wall, put washer on other side, slide bearing, then another washer, close with second wall and screw nut from other side. Bearings must freely rotate inside. Assemble second leg same way.

Variations:

I made two variations.
First (CR-10) has little "feet" that are meant to be put on top of Creality CR-10 control box (fits control box that's 125mm wide).
Second variant (generic) doesn't have any feet and can be placed on table. Both will probably work on flat surface, one without feet might offer slightly better stability.

Part was designed in Fusion 360, feel free to download original design and modify if needed: http://a360.co/2vA9bhP

Enjoy and let me know if you find any issues.