Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2560312.

This is a GEPRC LX5 LSX5 ESC Protector. They are designed such that the end at the steepest angle sits against the stack plate. It fits Aikon 30A HV's perfectly, but should fit other similar ESC's as well. Tested Spedix 30A, which are smaller, and they fit OK as well, but are quite a bit shorter than the Aikons. You can install these protectors without desoldering any wires.