If you are trying to print them together .355mm is the magic number for gap distance. Any smaller than that and you will risk it being fused together. Another thing is post processing is extremely important here. You must remove all the residual resin before curing. Again if you are printing them together you need top put holes in it to blow air into them to get the excess material out. It is a lot of work. But it can be done successfully.
If you are printing them separately then you need to add tolerances into your thread profiles based on the orientation that you are printing them in. I highly recommend printing them parallel to the build plate. If printing them parallel then you need to add your layer height to the pitch (.1mm). Then split the difference in the hole and shaft diameters of the thread for the (X,Y). So the hole add (.355/2) and the shaft subtract (.355/2). Doing this should make the threads come out perfectly, after properly cleaning and washing. I recommend that you print them separately.
One last thing, your galvos, main optical mirror, optical window (both sides), and the bottom of your build tank need to be spotless. Really try to avoid any supports on the threads, they will ruin them. Let me know how it goes good luck.