When I purchased a Top Fin 20-gallon aquarium starter kit, I made the dumb mistake of plugging in the heater before putting it in water. This caused both of its suction cup clips to melt. Thankfully, I was able to model and print this replacement part, which fits the kit's H100 Top Fin 100W aquarium heater.
I'm unsure if this model fits other heaters or suction cups, but here is a link to the public Onshape model. Feel free to modify it and post a remix for your setup!
I printed the clips out of black eSun ABS+, but I'd recommend using Prusament ASA or PC Blend for even more heat resistance. I strongly recommend against using PLA, PETG, or any other low-temperature material. As of writing, the clips have held up underwater for over a year.
Regardless of the material you use, please don't repeat my mistake: only turn on the heater when submerged!
The author marked this model as their own original creation.