filament reel mounting screw

So, this is my solution for quickly mounting filament reels.
The center bore is for a 3/8ths inch wooden dowel rod, about 40¢ at Michaels Hobby Store.
Total filament cost is about $1.25 when using $15/kg

Scale: 94 percent
Infill: 20 percent (100% for the pink nut)
Shell Thickness: 1.6mm
Resolution: 0.2mm
Rafts: None
Supports: None