Printables
www.printables.com
A 3D printed alternative to the Ecotech powerbrick holders.
I wouldn't mount these upside down hanging from the top/ceiling of an aquarium cabinet (there is no strap), but they securely hold the "MeanWell GST220A36-ET AC/DC Switching Adapter" to the 'wall' of an aquarium cabinet. Using PETG at around $23/kg, these use about $3.50 USD of filament each. I mounted them to aquarium stand with 3/4" #8 stainless steel screws.
