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.
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Openbuilds Xtension Connector Lid for Nema 23 Cover 2019-02-12
Xtension connector lid for motor cover.