This is a magnetic fan grill with a dust filter to prevent buildup of dust in the electronics compartment of Voron printers (or anything else). The magnets make these very maintenance friendly; when too much dust has accumulated on the mesh, just remove it and rinse it off!
Use M3 bolts for your fans. Note: Not all bolts are created equal. Some are magnetic, some aren't. Make sure yours are.
Use 6x3 circular magnets, superglue them in. Check polarity!
The dust filter mesh I used can be found here: https://www.amazon.com/dp/B0BHSS55RM?psc=1&ref=ppx_yo2ov_dt_b_product_details
Cut the mesh to size with regular scissors and use superglue to stick the mesh to the print.
The author marked this model as their own original creation.