Aquarium rim tray clip
thingiverse
I created this to give myself some extra working space while performing a water change or other tasks. It's designed to hold a cafe tray. This is the specific one I purchased but I don't think there's anything special about the lip (which is what this print holds onto): https://www.amazon.com/gp/product/B004DPBZXY/ The clip portion works for a rimmed fish tank. Specifically one that is about 31mm wide (or about 1 1/4 inches), including the lip that holds the top. The clips are pretty strong but I haven't tested their weight limit. I printed them with 3 outside layers to help with the strength and also 20% infill.
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