You can print it vertically/diagonally. I used PLA with 5% infill and 3 walls, but you are free to print however you like.

The corners for the Riser you can find here:

https://www.printables.com/es/model/514703-nu-k-and-d-riser-corners

If you want to download the Nu-K riser version you can find here:

https://www.printables.com/es/model/531320-nu-k-riser

if you liked my Riser please leave a like and upload your make ;D