Hi all
Which size nut should I be using for the F-roller?
The measured size in the STL file is 8.2 mm (see attached), and my M4 nut is 6.76 mm which seems to be pretty standard for M4 nuts (see for example here and here) and M3.5 nuts would then be even smaller.
It basically means that the two nuts are too loose and just keeps rotating when I try attach the M4 bolt.