a1 mini Sunlu Spool Adapter

For a long time i was struggling when filament was close to end but spool was stuck. 

I've realized that the reason is a big gap inside Sunlu spools so it was pulled to the feeder and was unable to move. So to solve this i'm created this bushing for spool.

Sizes:

Outer diameter: 74mm

Intter diameter: 34mm

Feel free to modify/resize for your spools if needed. For sunlu ones fits perfectly