Hand tools and fabrication machines
I often use the Arduino pro mini because of its small profile, mostly. And this device, I don't need to program it anymore and the pins to connect the USB UART interface take a lot of space and bothers.
I want to program them without soldering the pins to the board this simple device makes the job easy:
I 3D printed it based on a cloth pin (I use the spring of one) and added some solder at the base of the connecting pins to be sure they make good contact with the board: