With the addition of the cheap Matte Box to my 3d printed shoulder rig,
I found that with my short 50mm lens the follow focus would get in the way of the matte box.
So the night before EasterHegg I designed and printed a straight one.
It turned out that the hole for the trapped nuts was now long enough with the straight variation.
So now that everyone else is still sleeping, I corrected that and uploaded a Version 2 of my straight, 3d printable follow focus.
I found nothing else to be wrong with the first one, so it should work like a charm.
The first version works okay for the smaller skateboard wheels.
(I switched to softer inline-skate-wheels).