His 3D printed design uses pogo pins to securely connect to the ... the FT232R FTDI board that actually connects the chip to the computer so you can program it. We’d like to see a back panel ...

The board has an unpopulated ISP header from the assembler, so pogo pins are the answer. How do you make a pogo pin jig? With a 3D printer, of course. The ISP header wasn’t populated to give the ...