Printrbot Simple Metal Spool Holder with 608zz

The Printrbot Simple Metal is a wonderful small 3D printer.
Here is a spool holder for the Printrbot Simple Metal.
This will fit spools where the outer width of the spool is 53mm.
Parts used :
4x?608zz bearing
4x?M8x30mm screw
4x?M8 nut