Summary

Keeping your tower on the floor is a massive NO NO
The fans will suck in dust off your carpet and reduce the longevity of your machine.

Designed to print 2 - one for each end of the base of your PC - 200 wide should accommodate most.

I designed these simple risers to bring it up off the floor to avoid dust intake.
The triangular hollows are to reduce filament and its still a work in progress to see how many more i can remove while keeping it strong enough to hold a beefy PC. Triangle also means no supports required. But they may mean actually more filament as they do perimeters for those two- 3 options to choose from anyway.

NO responsibility if you print and it fails and something breaks -

I am testing at about 10% infil and 5 shells, 5 top 5 bottom no supports

Yes you can use a lump of wood or a few bricks but wheres' the fun in that! Print translucent and throw some LED's in