The file 'Milwaukee Drill Bit Holder Expansion 3D Printer Model' is (stl) file type, size is 1.3MB.
I bought a Milwaukee Thunderbolt drillbit set a while back, and it's clearly a modular case Milwaukee just fills out as needed.
So I printed this little guy to take advantage of that extra space.
It's pretty specific, but someone asked for the .STL, so here's the upload.
Milwaukee_Bit_Holder_Expansion.stl | 3.5MB |