Simple solution are the best, right?

After thinking about some overengineered solution of using small filament sample spool I remixed last week on my Prusa MINI spool stand with ball bearing, clearly not designed for such a little thing, I decided to make it simple.

I bought Rosa3D Master Spool for their refills. Cheap (around 3-4 Euro), strong, reusable and as they said “AMS compatible”. Widely available in Europe. If you can't buy it, you may print it from here https://www.thingiverse.com/thing:5938871

On original refills they use cardboard tube. I designed 3D printed adapter of the inner size of remixed sample filament spool (check my other designs for spool and stand!), reinforced it a bit and added 2 shims. That way you may use two filament sample spools same time, or using shims, just single one. Simply press adapter to one Rosa3D disc, add 2 sample spool (or shim, one sample spool and second shim) then press second Rosa3D disc and use it as normal size spool!

The height of adapter is exactly the same as original paper tube - 56.8mm. Rosa3D state that their spools are AMS compatible, my adapter should be compatible too. If it's too short or too long, please let me know in the comments or in direct message - I will add correct size one!

Print it in PETG to have some flexibility.

I hope you will find it useful. Any feedback welcome.

Happy printing! :)