10" / inch mini server rack using 2020 aluminum extrusions

Fully printed racks are great and all but they take absolutely forever to print, a chore to expand, and are really flimsy. 

BOM:

• 4 x N+1 x 50mm extrusions: for example for 3U you need (3+1) x 50 = 200mm

• 4 x 200mm extrusions: these go across to make the rack 1-" wide

• 4 x whatever extrusions: these give it depth, you can use 200mm if you want a square base

• 50 x M3x10 screws

• 50 x M3 slide nuts

• 12 X M5 hex nut per U (realistically just 8, nobody uses the middle one anyway)

• M5 screws for rack mounts, I used 12 and 16mm ones