I found DEMCI Filters after a quick Google search. They appeared to be exactly what I was looking for., a subdued and subtle addition to protect my new 3D printer from stray bits of filament that I started a bad habit of placing directly in front of the PSU enclosure intake. I browsed through their current standard and history of previously requested custom sizes but could not find the one I needed. I was very impressed that they offered custom sizes. The custom guide was easy to find on the site as well as easy to follow. I just needed a simple rectangle but it was nice to see how they can make intricate shapes if you provide detailed and correct info. The process was painless. Communication was great! Once the details were finalized, my order was processed quickly. My filters arrived surprisingly fast to Florida (order placed 23 Sept to doorstep 06 Oct in 2020). Firstly I have to say they look even better in person than online. It really is exactly what I wanted from the feel to the magnetic adhesion (I knew I needed the non-ferrous extra). I just installed one in like 2 minuets and it looks great! I'm so happy. I remember seeing a link to post photos, and have some to upload when I find the link again. I will definitely come here first for any future filter needs.