If you just got a Monport K40, or any CO2 laser, this keychain is a nice easy project to start with. It’s also something you could sell if you want to.
I design it in LightBurn using mirroring and offset for the engrave and cut, then position the material, set up the laser and run it. It’s honestly a pretty simple process.
I used clear acrylic here, but plywood or MDF works too. I also have more K40 videos planned, including modifications like an automatic bed.
It doesn’t take much setup and it looks good when it’s done, so try a few designs and materials and see what you like.