Made to go against a wall so that the wall helps support the board. I made this because i did not want to mount aything to the wall. 

It was made to mount the monitor stand below it using the original holes in the corner. Not sure the brand but i can tell you that is 24" wide. You could likely remix the mounting style.

Works really well with the whiteboard here:
https://www.amazon.com/dp/B00U398RDA?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

Material: PETG

Standard Slice Setting supports not required print with slots facing up.