I had issues with the Topfill arrangement of my Vaporesso Cascade Tank. Sometimes it opened a little in my Pocket and a lot of liquid leaked.
So i thought i design a quick Safetycap for it.
it clicks on an of like a charm (at least in 90% of my prints) and is a quick print that can help you if you have the same issue like i had.
Layer height around .15 is advised for extra accuracy. I had different results with different filaments concerning accuracy. Try size it up or down in 1% steps if it doesnt fit properly.