Filament roller stands

I usually use two such stands with two 8x22x7mm bearings each. (Inner diameter / outer diameter / width). This  bearing size is also referred to as standard "608" size.  Therefore, the bolts are M8 by 25mm long. I use lock-nuts, because I have them. But normal ones will do fine.
 

Since you will have to print two stands and use them together, you are also very flexible regarding spool sizes. However, a design with pins or tubes between two bearings each has its advantages. This design tends to wander around ever so slightly.

Background

I recently used a spool that had such a thin rim that it kept getting stuck between the bearings and the holder side.

Simple solution: Print a ring with a V-grove on the outside to fit around the bearings. Problem: The existing stand isn't tall enough to hold the bearings with the V-ring. Over-engineered solution: Recreate the stand with enough space.

SCAD

The SCAD file lets you define the bearing dimensions and matching hardware. It also includes the V-ring to match.

Printing And Assembly

You will need

• 2x roller-stand
• 4x bearing (8x22x7mm, standard 608)
• 4x screw (M8 x 25mm)
• 4x nut (M8)
• (optional) 4x v-ring

I printed my pair of stands in PLA with 20% infill but without support. The v-rings were printed in PETG but for no other reason than that was the installed filament at the time.