printrbot jr v2 cooling fan duct

youmagine

The build-platform adjustment nut just barely clears the duct end when my machine homes in. If you're feeling bold, dive into the often-maligned Openscad and adjust the duct to be a bit lower and longer. Despite this, significant airflow persists on the far side of the nozzle even with its current design. Additionally, the end of the heat-break duct may require trimming, assuming your printer excels at handling overhangs.