I think rather than experimenting with fabbing on Mars, you would probably be better off sending an absurd amount of CPUs from Earth. A 300mm wafer weighs 150 g

I think rather than experimenting with fabbing on Mars, you would probably be better off sending an absurd amount of CPUs from Earth. A 300mm wafer weighs 150 grams and can fit 30k Raspberry Pi Nano CPUs on it, 2mm^2 on 40nm. If you send up a wafer per person, which can be laser cut and placed into more easily constructed electronics locally, you've got hundreds of years to solve the fab problem in a worst case, Earth no longer exists situation.