This is a brime shrimp/shrimp/lobster/fish eggs Hatcher. This is a interesting project. 100% working project. 3d printables files attached. 3 different sizes are available. 3 sizes are 50mm, 70mm and 100mm . Please find other sizes. Two design design concepts are available, one regular and other one low cost version. In low cost version you have to use 500ml to 2000ml any water bottle. And regular design you have to use lam shade glass. Lamp shade glass link provided below. Lamp shade sizes are 50mm, 70mm and 100mm.

Here is the glass shade link,

https://www.amazon.se/-/en/Oberstdorfer-Glash%C3%BCtte-borosilicate-cylinders-diameters/dp/B08X4NTPKP

Custom size and design available. Please contact with me for more details.

Thanks,Mahbub