Spool for fishingline for 3D Printers, Nema 17, Spule fuer 3D Drucker

For Rostock, or Kossel or Delta or Richrap or or or....
Diameter inner=5mm
Length = 20 mm
designed for M4

pls prefer with radius because of better printing...

you have to drill the mini holes for the fishingline by yourself, because we dont want to reduce our stability by printing.
The designed spools by richrap arent good, cause they delaminate
at a period of time.

a grandious Advantage is:

much less enertia in comparance to toothbelt.
much cheaper than toothbelt

I have designed it because i didn't found something good like that.
note: pls use multifilament fishingline, because the others just to elastic...