Simplest and easiest vertical GPU solution EVER. After being frustrated at the lack of solutions, and not wanting to lose all my expansion slots OR cut my case up, I decided to design these. You will obviously need a PCI riser (cost me $20). I also bought some 90 degree angled cables, and then ran the female ends thru an expansion slot I left the cover off of, so I didn't have to do any permanent mods to the case.
YMMV, but this actually dropped my GPU temp at idle by 3-4C degrees, and under load it dropped 10-12C.
See misc notes for more details.
Print all the brackets as follows :
'Back' bracket with the 2 holes facing up.
'Bottom' with the opening facing upward.
'Front' lying on its side.
Use whichever screws you would like for the back bracket. Double sided tape the bottom bracket to the case, and double sided tape the front bracket to both the GPU and the case.
Depending on how the 'fingers' look on your GPU depends on which bottom bracket you need. If they are flat, print the flat bracket. If the fingers are slightly angled, then print the angled bracket.