The hobby foam dew shield my wife had made me for my ETX-90 had ripped along the sew line, so I made this dew shield to replace it.

I used a single sheet of self adhesive felt on the inside to make it smooth against the OTA as well as help with stray light. A single 8x12 sheet will work, I had to double up a section on the bottom or the dew shield was a little looser than I liked.

I would have printed it out in black, but I was out of black filament.