This is an underdesk mounting kit for your atx power supply. I have configured the side height that it aligns with the power supply. The Velcro I used is from 3M (electrical tape) with 25 mm width.
For Printing I turned off the support structure since I was afraid that the small bridges on the back (for holding the Velcro) are supported as well.This results in a little cleaning work, since the first layer hangs in the air. But inserting the tape worked out just fine.
If someone reprints this please let me know if it works with support structure as well.
Attached you also find the solid works part. The second mounting plate is just mirrored.
Have fun printing.