once printed you just need to add two velcro straps on the bottom base and one on the window., necessary supports, no raf, just brim. (it serves to keep the window slightly open) v-1.0

V2.0 revised file with the addition of a 1mm recess (45x45mm dimensions) and on the front with the same 1mm recess (16x75mm) to insert the felts more easily (narrowly moved to the side to make the design cleaner