You favourite new JLCPCB fabrication option:
E-ink silkscreen layer
Hyperspace vias
Superconducting ground plane
Octarine soldermask #GNUTerryPratchett
Mobius layers
Previous day delivery
Mandelbrot edges
Penrose tile panelisation
Poll ended at .
@jpm @Unixbigot I have no idea if "fully passive protocol-aware auto-crossover network" is an actual thing or completely made up. Well played, have points*.
*the points, like all of us, are not redeemable

Attached: 3 images I've implemented a KiCad footprint that provides an "oh fuck I got tx/rx backwards again" crossover box. Not my idea but I forget where I first saw it (I think it was here on Fedi). Fit two resistors (or solder bridges) horizontally and it's straight through; fit them vertically and it's a cross-over. https://github.com/accelerando-consulting/Kicad-Libraries/tree/master/Accelerando.pretty ETA: the name of the footprint is “Oh_Fuck”.