Can you tell me where this part broke/disconnected?

I printed today without a build plate and it made a mess and at one point made a noise because there was such a big lump of PLA stuck in the print head.

I stopped the print and there was a part like this in the print area. Can you tell me where this part broke/disconnected?

The Nozzle Wiper is intact, and there is a similar part in place.

There is a small cap that fits an Allen key.

I found a spot where part of it had come off.

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