About this 3D model
I ran out of screws and nuts and could not wait to mount the bearings 608Z in my just printed RostockMax Spool holder (http://www.thingiverse.com/thing:106977) You will need to print 4 sets. There are two versions for the screw, with and without shoulder (the last is faster to print). Of course, you can use this set for other stuff :-) Enjoy! BTW, thanks for the design Tom (daftscience http://www.thingiverse.com/daftscience/overview). PS. I had only to wait 1 hour designing and 80 mins printing + 30 mins troubleshooting, vs 30 mins travel to my local shop. But the fun is timeless :-)