3D printed Super 8 cartridge opener

I opened my first cartridge in daylight with a saw…
Everybody developing Super 8 films on their own sooner or later faces the task of opening the Super 8 cartridge to get the film into the development tank. The latter goes with some practice, the Lomo tank and a turntable in less than 30 seconds. When opening cartridges, opinions differ: Some break the ratchet inside the cartridge by a counterclockwise 360° turn and then pull the film out of the cartridge. Others, (to which I belong) open the cartridge and take the film wind out all over, and load it into the Lomo reel.
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