This is a modified lid for the following NEMA 23 stepper motor cover on Thingverse. (NEMA 23 Stepper Motor Cover by chaddavisdesign)
This lid mod fits the OpenBuilds Xtension Connectors.
Openbuilds Xtension Connector Lid for Nema 23 Cover 2019-02-12
Xtension connector lid for motor cover.