This is a quick and easy upgrade that will allow you to easily and quickly attach and swap out "phone" camera lenses on your Game Boy Camera.
I was unhappy with other solutions that either remove the ability to swing the camera around for selfies or otherwise are adapted to use hard to find specialty lenses.
My design allows the use of just about any of the in-expensive screw-on type phone lenses you can find on Amazon. Specifically I bought this kit, but it should work with just about any you can find. Do note that the lenses DO interfere with the ability to turn the camera around when installed so don't forget to screw them off beforehand.
These lenses are fairly cheap so expect quality to vary wildly. Some types of lenses will give you some lenses will show signetting especially in low light but it's not too bad.
Installation is very simple, just replace the front cap with my version and enjoy. I do recommend printing this out with an opaque material as well as using the Game Boy Camera light blocker you can find here.
I do also recommend printing with a fairly tough material as to improve the life of the threads. Depending on your printer capabilities, you'll want to orient your print in one of three ways. Standing up, completely flat on its back with the lens pointing up, or on its back at a slight angle keeping the "top" of the lensadapterr as perpendicular to the print bed as possible. Experiment with your printer. The smaller the layers the better. I printed at .12mm which gave me fairly good threads. Print at 4 perimeters and/or with 90% infill or more.
Have fun! If you want to help out feel free to buy me a coffee https://ko-fi.com/0dysseusrex