This is a snap together case which is extremely breathable. I added some robust mounting tabs to the end of the model with chamfered holes to fit M3x6mm heated inserts, which allow for a solid mounting solution which can be repeatedly removed and reused. The case itself is fit with plenty of ventilation, as it will be inside the Prusa enclosure with my Mk3s+.

After 6months printing almost exclusively with PETG, the Rpi4b still has not had thermal issues, and the case has been removed and put back in place numerous times.