Decorative cover for audio transformers, in this instance sized for Lundahl LL16XX sized interstage and line output transformers. These are 75mm square by 80mm high.

Has holes sized for M3 thread inserts. I printed these using Polymaker HT-PLA as they will be used in a vacuum tube amplifier and subject to some heat. Mounting holes are on 65mm centers.

Step, STL and F3D files included. If magnetic shielding is desired, one could glue in some steel on the sides and top.