I designed this GPU stand to be of adjustable height. The base height is 70mm. Each step is approximately 7.75 mm increase. Max height is 110 mm. This is version one and I plan on improving the design and will upload.

Version 2 is uploaded and available. The X and Y dimensions are reduced for faster printing.
https://www.thingiverse.com/thing:5899940

Creality

Ender 3