Octa-B Braille learning tool it2

This is an upgrade of a previous design :
https://www.thingiverse.com/thing:2302709
(see more detaills and video)

for this iteration, 2 magnets are added on one part, 8 nuts on the other in order to keep both parts together and provide a magnetic locking for all 8 different positions (when dot faces are matching).

-magnet size (qty 2) : diam 3mm - h 3mm - type neodyme
-nut size (qty 8) : M5 - thk : 2.7mm - type DIN 439 (ie https://www.accu.co.uk/en/thin-hexagon-nuts/73060-HFN-M5-A2)
-bearing (qty 1) : skateboard / roller standard size (8mm (core), 22mm (outer diameter), and 7mm (width)
-screw M3 - L 12.5mm (optional)

magnets and nut need to be stuck.

Let's print and enjoy !