The sonoff mini is not an easy device to flash with custom firmware. This programming clip allows an easy and reliable connection to VCC, Ground, Rx and Tx.

I already use this, https://www.thingiverse.com/thing:2980893 for my sonoff basics. So I decided to design one for the mini.

You will need 4 x 1mm diameter pogo pins and a spring with an internal diameter greater than 7mm. I used an 8mm x 25mm spring so the clip can grip the board well.

On the other side of the board, the clip uses the relay and one of the capacitors to help position the clip. If anyone finds that the fit is too tight, am happy to make some adjustments.