This is a CO2-cover we desinged to laser cut, to maintain CO2 concentration stable in cell cultures. It is based on the following Pecon CO2-cover : https://www.pecon.biz/products/product/?pid=5313|CO2-Cover_KH
It was designed with FreeCAD (and LC interlocking workench), here is the original file if you want to make some modifications : co2_enclosure.fcstd
Here are some picture of the box on a microscope :
If you want to replicate this CO2-cover, you will need 4 mm thick PMMA sheets, a laser cutter and this dxf file :