Bell trap drain covers.

thingiverse

I have a bell trap drain on my roof, and recently had to replace the rubberized roofing material. The drain is recessed under the roofing material with a gap to allow water to go underneath. I caulked under it but as an extra measure, I wanted to have a cover which fits over the material but is not too high to impede the flow of water drainage. I had to redesign an existing cover from this thing: https://www.thingiverse.com/thing:4224516. The original design was a little loose so I increased the scale. In another design, I have a trim ring added, and in another design I have a trim ring with a deep body to go through the roofing material. The remix was performed with 123D Design, Slic3r, and Matter Control version 1.7.5.