I uploaded your model and it came into SW without any errors. What is your print orientation? I should be flat on it’s back. You shouldn’t need that little island on the bottom of the pistol handle either. If you are printing in the vertical position as it imports into SW you have a lot of unsupported features that would require a dual extruder. The Dremel appears to be a single extruder. If you lay it on it’s back I don’t believe you will have a resolution problem at all.
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