This is a riser mount for aquarium lights. It can be used if you bought a light that's too long or too short for your tank. 
I made this because I needed a riser due to my large driftwood, and the light I bought was too long. 
It’s designed for 6mm thick glass, but you can adjust the dimensions in Bambu Studio to fit your setup. 
I printed it in transparent PETG with no infill and 5 wall lines to make it aesthetically pleasing.

Update – Version 2 (Feb 2026):
– Added an internal cavity to break capillary action when the tank is overfilled, preventing water from wicking out through the bracket.