As most of the models I have uploaded I had a need. I have a 2012 33ft Keystone Laredo camper. The furnace doesnt seem to heata the interior very fast. Several ducts have very low airflow, after researching the problem I come to find its pretty common. In order to prevent the sewer and water tanks from freezing they use they open the ducts into the under carridge of the camper. I never use the camper when its that cold so I disconnected the floor duct and installed a duct direct from the furnace through the front grill. Works really well, getting full heat from the furnace now. The furnace would run cautiously when it was 40f and now it runs for an hour or so and shuts off.

Use supports when printing and I used ABS because of the heat, PETG may work , didnt try it. PLa will not work, I did try it.