Spacer file was extracted from the original Thor400 model provided by https://www.printables.com/@GRIMM_2040833. Then I increased the thickness from 0.9mm up to 1.6mm for pairing with a 1mm thick thermal pad.

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My controller terminals were protruding 1.1mm. 

So, 1.1mm obstruction + 1mm thick thermal pad = 2.1mm.

Subtract  the 1.6mm spacer provided here and it should leave you with 0.5mm of thermal pad squoosh.