This is a cap for the Z Axis to plug in a aluminium plate or a sensor.
Here are an example plug that i used: https://de.aliexpress.com/item/4000097123821.html
DC-Hohlstecker-Buchse 5,5 x 2,5 mm/zweipoliger Terminal-Block
It should be a tight fit but a lottle bit glue helps.
Category: Parts
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Thanks, Alex