Made my own design of spool rack that is printable on A1 mini and under 100 g of filament. I cannot find model that can be properly located on A1 mini bed and having clearance against the wall or without excess amount of support material.

In this design I've used 24 mm broom stick from OBI, no support needed, and you will have 2-3 mm clearance against the wall with standard size 200 mm spools. The wood screw heads are recessed into the part. Designed to have sufficient space for tightening the wall mount screws with drill.

Required materials:

⌀8 mm dovels (4 pcs)

⌀24 mm broom stick (2 pcs)

⌀3,5x20 mm wood screw to fix broom stick movement (4 pcs)

⌀4,5x50 mm wood screw to mount the rack into the wall (4 pcs)

Tips: 

You can pre-drill the broom stick fixing screws with ⌀3 mm in place.