This is a door stay to hold the enclosure doors open and steady during PLA printing.
There is a void in one bracket to insert a small 10x5x3 magnet.
https://www.amazon.com/gp/product/B0CJC6D878/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Insert a pause at the appropriate layer height to insert the magnet.
The author marked this model as their own original creation.