feedback for 3D assembly BBMB_V2

Change 2 from NIC’s new file 20220301:
The position for gear
------ OK ,no problem from Hasion 3.1

Change 3 from NIC’s new file 20220301:
The thickness for here position
------ 0.6mm not OK , It at least 1.2mm--Hasion.3.1
because only 0.6mm thickness ,
too thin , easy to be broken

Change 4 from NIC’s new file 20220301:
the hole is through hole type