Avoid match-deciding power losses by securing your power cables to your control and expansion hubs. This version improves on the publicly available version on Printables by @huddya_766931 (https://www.printables.com/model/624466-xt30-retention-block-for-controlexpansion-hub) by including a 3mm threaded insert rather than having to find (and potentially lose) a nut. M3 x 10mm cap head screw included.