The file 'M3 Nut And Bolt 3D Printer Model' is (stl) file type, size is 465.2KB.
How small can you go!
I had such success printing a 1/4" 20 nut and Bolt, I thought I would see just how small I could go!
This is an M3 Nut and bolt I drew in Fusion.
I sliced it in Simplify 3D