We’ve all been bitten before by USB cables which were flaky, built for only charging, or just plain broken. With the increased conductor count and complexity of USB Type C, there are many more ways your cable can disappoint you. Over in Austria, [Peter Traunmüller] aka [petl] has designed the C2C caberQU USB C cable tester. This small PCB tester checks every wire on the cable, including the shield, and both connector orientations. He also makes a version for testing USB A to C cables (see video below the break).
Automatic cable testers are often associated with factory production, where you want to test a large quantity of cables quickly and automatically, and are priced accordingly. But this project makes it affordable and easy for anyone to test single cables in a home lab or small office.
The tester only checks for basic continuity, but that should solve a majority of USB-C cable problems. All the documentation for this tester is available on the project’s GitHub repository, including Gerbers, schematics, and mechanical details. Or if you’d rather buy one pre-made, [petl] has put them up for sale on Tindie.