In order to test this reflow oven, I designed a small board which will also help in doing some testing for a few other projects. Very simple board – 3.3-6V power input, SWD Debug port, Console (LPUART), 8 UARTs to connectors, Both FD-CANs thru a transceiver and exposed. 4 Buttons and 4 LEDs on digital ports, 3″ x 3″ board. Caps/Res/LEDs are 1206s because I have some here and they will be easy to hand place.

Anything stupid?

I use the ST Appnote for this series for layout and power/clock setups: https://www.st.com/content/ccc/resource/technical/document/application_note/group0/e8/d8/d0/32/33/94/41/dd/DM00337873/files/DM00337873.pdf/jcr:content/translations/en.DM00337873.pdf