I made this holder so the tube doesn't fall out of the aquarium when I am doing waterchanges. It goes over the edge of my juwel aquarium which is 13,5mm wide and it fits 16mm tubing very tight. It took me a few minutes to get it through. You may want to upscale it a few percent or warm up the tube to make it easier.
Aquarium_16mm_hose_holder.stl | 89.9KB |