A1 mini retro air filter

Retro air filter for the A1 mini that uses ¼" foam that I purchased from Walmart for around $3, for a piece 24"x15"x1/4". No supports, no glue, unless you want the wing nut. I put the wing nut and center guide on a separate plate, so you don't have to print it if you don't want. Everything else snaps together. Step 1. Snap coupling into cage, BEING VERY CAREFUL TO LINE UP the grooves in the coupling with the rungs inside the cage. It's a tight fit so take your time, I've done it several times so it will work without damage. This was intentional since you will never have to pull these apart again, thus having to remember to line things up every time it comes apart. Step 2. Cut a piece of foam a little wider and longer than is needed and insert it into the cage. Step 3. Snap the cap onto the cage, nothing to line up. Give it a slight push in the middle until you hear it snap. After you've done this a few times it will get easier to put on and remove as