I saw some safe chamber indicators that inserted just like magazines. I was too cheap to purchase one from Flagazine or another company and so I modeled and printed my own. Anyone is welcome to the model files to tweak them, or just take the .stl files to print yourself.
SolidWorks, .STEP, and .stl files exported both in inches and meters (depending on what your 3D printer might default read in) are available in this google drive folder: https://drive.google.com/open?id=197ySGh_mzbvvsLBYxSHBwDBIfsifz9yI
SolidWorks, .STEP, and .stl files exported both in inches and meters (depending on what your 3D printer might default read in) are available in this google drive folder: https://drive.google.com/open?id=197ySGh_mzbvvsLBYxSHBwDBIfsifz9yI