Simple spool system for a Mendel (or other 3d printer)

Well i wanted to have a very simple, but bearing based spool system.

So i came up with this.. its only one new STL file needed twice.
And I used two old z-leadscrew-base_2off parts.

So here is complete list:
2x z-leadscrew-base_2off STL
2x spool_v2 STL

6x m4x16 cap screws
12x washers m4
6x m4 nylock nuts

3x 180mm stud m8
1x 280mm stud m8
4x 250mm studs m8 (depends how high you want your spoolsystem to be)

28x m8 nuts
24x m8 washers
4x m8 large washers (regular might als