I made an Ikea Lack enclosure for my Prusa MK3, but I was having some trouble with it vibrating and affecting print quality. To try and fix this I designed these brackets. After strapping 15 of them to my enclosure they seem to have helped the rigidity of the enclosure. If your having the same problem it might be worth a try.

Most wood screws should work. The only difference between the two bracket types are the hole sizes.

I recommend printing in PETG just to avoid splitting the plastic when tightening screws but PLA will also work if you're careful.