Beam
thingiverse
I came up with this a while ago and have just now finished posting it. It can easily hold at least one thousand pounds.\n\n \n \n Directions\nPrint on standard quality with 5% fill density. Don't use raft or support. Also, only print the beam straight up.
Download Model from thingiverse
With this file you will be able to print Beam with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Beam.