Gearing:
--> OK ! Great.

Fan:
--> i will add two of those

Vacuum pump:
--> tell me, is the car vacuum pump adequate for long time work and such setup ?
--> as you know robot should work 24/7 and pump that am using now is volvo car pump
UP28 .... https://www.amazon.co.uk/PERFORMANCE-Electric-brake-VACUUM-VOLVO/dp/B07213VRVK

Its powered from PC PSU 12v / 10A and it looks like it draws a lot because 2A PSU was not enough for normal work....

A.