Filament spool clamp / holder for 52mm spools on M8 rods

Simple filament spool holder for spools with 52mm hole. The spring construction will clampt the spool, so the rotation is provided by the bearing.

For one spool clamp you need following parts:

Print:
1x "Filamenthalter Unterteil.stl"
1x "Filamenthalter Deckel.stl"
3x Filamenthalter Druckstück.stl"

Buy:
3x Spring 0,5x4,5x12mm
1x Bearing 608ZZ (8x22x7mm)

I used these springs: http://www.ebay.de/itm/262066973062?_trksid=p2057872.m2749.l2649&var=560845587650&ssPageName=STRK%3AMEBI