This is a fun little adapter that converts 2x USB3 A-B cables to a USB3.0 specification section 5.5.2 compliant host-host debug cable.
2x Pulse Electronic E8199-030-01 digikey PN 553-2263-ND
2x XKB Enterprise U235-091N-4BLRC16-2-5 LCSC PN C388653
Use the gerbers in the zip file. Designed to match JLC's JLC7628 stackup with 4 layers.