I wanted to change the settings for the thickness of my desk so it hugged it nicely. I copied the design into openscad so that I can make this for the different thicknesses that I need to deal with.

If your desk thickness is not 25mm, modify the openscad file with the value

desk_thickness = 25;

to your desk thickness and exporting it as STL for consumption by your slicer.

I found it best to print one, check it fits, then create out as many you need on a single print.

You could also no modify the thickness and tape it to the bottom of the desk with doublesided tape. This may be an easier option for those who don't want ot use openscad.