My dryer vent cover decayed in the sun and cracked into pieces. I wanted to make a quick cover that would prevent rain from entering the dryer vent and keep birds and such out, but could be used until a suitable replacement is obtained. This is that part. Print in two pieces, no supports, start with the tube's true 4" circle side down and the tube's 1mm wall thickness is a double pass per layer (it prints quick). It should just snap together (on the oval side - one side is a true 4.1" circle the other is slightly oval) so it can be cleaned if there are lint blockages.  I fixed the model when I noticed my grid pattern spacing was off. Use at your own risk - dryer lint vent blockages can be dangerous.