Easyflash3 is re-programmable Commodore 64 cartridge that supports all CRT files and fastload cartridge binaries like Action Replay, Final Cartridge Etc. You can find more details about it by this link: https://skoe.de/easyflash/
I used Solidworks to measure and model the existing electronic part first. I use calipers to measure all distances and clearences while creating the model. And next I modeled the case by referencening the electronic part.
This way I had a chance to get rid of that center screw which I don't like on cartridges. It's economic and easy way for an assembly but my version is more rock solid at the end with no loose fixation between case and the PCB.
You can see the timelapse video by here:
Here are some photos of the assemblying 3d printed parts. Hope you like it, see you on next project :)