Ball Bearing Wall-Mount Spool Holder

Design: 

This has been designed for a 1kg filament spool to freely spin while held snugly against a vertical surface. I made it to go inside my printer enclosure (see pictures) and can confirm, it does indeed spin very easily! 

It uses two skateboard ball bearings (i.e. 608 series bearing - 22mm OD, 8mm ID, 7mm wide) as they are super low friction, cheap, and easy to source. 

You will need: 

• (2x) Skateboard bearings (i.e. 608 series bearing - 22mm OD, 8mm ID, 7mm wide) 
• (5x) M5 nuts and bolts 
  • Bolts between 20mm and 30mm long. Socket head recommended but other types will also work 
    • washers recommended but not required  
  • Nuts can be locking or regular 
• Fasteners to mount to your vertical surface (5mm mounting holes) 

Printing Instructions: 

Most materials should work for this design but I recommend a creep-resistant material as these components will sustain prolonged loading. I used ASA. 

I printed all parts with 0.2mm layer height, 3 perimeter layers, 15% infill, using a 0.4mm nozzle. 

Supports: 

• NOT needed for the two parts that hold the bearings. You will need to punch through a thin layer of material to fully install the bolt for the main bearing. 
• NEEDED for the two parts that interface the spool. I used automatic supports with a 50 degree threshold. 

Assembly instructions: 

If needing to drill mounting holes on your vertical surface, use the main bearing mount as a drill guide before final assembly of this spool holder. 

Attach the first bearing to the main bearing holder part and secure it in place with a nut and bolt. 

Install the second bearing to the small bearing holder attachment and secure those two components to the main piece with a nut and bolt. 

Slide the main spool mount onto the first bearing and rotate it such that the holes for the fasteners in the spool mount align with the groove on the side of the main bearing mount. Install the first of 3 bolts to secure this component to the bearing, then rotate to install the next two bolts in the same fashion. 

Mount this assembly to your vertical surface ensuring the fasteners are positioned at the top. Rotate the spool mount to give access to the fasteners. 

Install your filament spool on the largest diameter step it will easily fit onto and hold it in place while inserting the outer spool mount to support the other side of the spool. 

Please comment to share your experience with this design. 

So far, I can confirm it works for Prusa 1kg spools and Polymaker 1kg spools.