9mm Luger Case multi gauge

This is a simple but quite useful design for me. The large slot corresponds to a 29.01mm OAL cartridge. The small one is for a case that fits within the corresponding 19.01mm size, so it doesn't need to be trimmed. The holes, according to the photo, are: C: Thick base (very thick) O: Exact diameter where the case should sit for proper headspace (if it goes in too far, there might be a problem; if it doesn't fit, something is too thick). P: Passes through. This is the classic gauge to ensure the measurements are within range and it will fit the chamber without problems. A little cleaning and deburring is needed to get it right, comparing it to the cartridge you want to use. A comfortable version has 5 walls, three bottom layers, three top layers, flattened horizontal surfaces, and 35% infill. Generic Hellbot PLA. I hope you find it useful and please share or leave a comment.