Sonoff 6 pin Programming clip.

thingiverse

UPDATE. USE AT YOUR OWN RISK. A user tested out this clip and the S31 board is too loose to maintain stable connections on the pins. Without an S31 device to use for modeling, I cannot correct this. See comment section below for more information. A user requested a 6-pin version because the Sonoff S31 outlet has 6 pins on the serial port connector (VCC, 2 pairs of RX/TX, and then GND). My standard sonoff basic clip only has 5 pins. Print it, install pogo-pins in place, connect to your USB UART TTL adapter, and it will hold the pins securely to the right connectors. The pogo pins I am using are P75-E2 Convex Tip Metal Spring Test Probe Pin, with a diameter of 1.5 mm. You can find them here: https://www.amazon.com/gp/product/B018YPQ6ZK Note: Rotate the model so it sits flat in your slicer for printing. Note 2: I did not create this myself; I don't have a S31 outlet, so I had to rely on user feedback.