I needed some legs for some shelves, so I figured I'd have fun with it.
M1 and M2 are the same. They're only two files for organisational purposes.
You will need 10mm holes at each place the legs go through the shelves.
Shelf heights are 70mm on the bottom and 90mm for each M piece. Print as many M as you need for your shelf count.
The lamp bracket fits on any M section.