The file 'AA Adapter For M3 Hardware 3D Printer Model' is (stl) file type, size is 31.4KB.
I remixed the previous design by opening up the holes at each end, adding guides to hold a M3 nut in place, and a flat side so it can print horizontally (which is easier to achieve higher print speed and reliability).
AA_Adapter.stl | 95.5KB |