The dishwasher indicator. Sometimes, it is hard to determine if the cutlery inside the dishwasher is clean or not, especially if you are living with other people. Press the dishwasher indicator’s button to change the state of the indicator LEDs, once you started the dishwasher, once you realize it has ended, if you need to, once you emptied it. The battery of the first PCB project I have made was dying in a few hours. Thanks to AVRs watchdog timer interrupt, this ones battery theoretically lasts about 20 years. Theoritically, because the battery’s best before date would expire 😛 .
Also, I tested printing a textured part from FDM. Front of this part is the textured side. Not the most worthwhile thing to do, but is interesting, I guess:)

I 3D designed it using @SolidWorks. I designed the circuit board using Altium. I 3d printed it using @makerbot.