Spool 150 mm

I searched online for a decent small spool which uses not much filament and is easy to print. Well I found none, so I designed my own.
It consists of two parts, both are identical. With a small amount of glue, it stays together like it's one thing.
I designed it to be printed with 0.5 mm layer height (the "rim" is 2.5 mm high)
You have to enlarge the holes with a 3.5 mm drill bit, printing smaller holes and enlarging them after, gives the parts more strength :-)