Mount for a temperature or humidity sensor on top of the Prusa MK3S printer.
Sensor: https://www.aliexpress.com/item/32991139200.html?gps-id=pcDetail404&scm=1007.16891.96945.0&scm_id=1007.16891.96945.0&scm-url=1007.16891.96945.0&pvid=2f2cab42-ae67-4402-a88b-f296fbba95c4&_t=gps-id:pcDetail404,scm-url:1007.16891.96945.0,pvid:2f2cab42-ae67-4402-a88b-f296fbba95c4,tpp_buckets:668%230%23131923%238_668%23808%234093%2365_668%23888%233325%2318_668%232846%238114%23800_668%232717%237565%23776
The author hasn't provided the model origin yet.