P2S Hot Air Deflector (Downwards)

P2S Hot Air Deflector (Downwards)

I spent several days chasing adhesion issues on the right side of the bed, affecting both bed adhesion and steep overhangs. While glue and print setting adjustments helped, results were consistently worse on the right side compared to the left, which suggested the root cause was elsewhere.

There are several auxiliary fan diffusers and deflectors available—which I would recommend using in tandem with this design—but most existing P2S hot air deflectors suffer from two common problems: weak snap clips that break during installation and restricted exhaust airflow. This model was designed from the ground up to address both.

The deflector preserves the stock exhaust outlet surface area and simply redirects airflow downward, avoiding back pressure or unnecessary turbulence. No airflow is reduced or reshaped beyond what is required to change direction, maintaining proper exhaust performance. By directing airflow toward the bottom of the chamber, the temperature gradient is mixed more effectively, resulting in a more even chamber temperature.

To improve durability, the model is specifically designed to be printed vertically, aligning layer lines with the forces applied to the snap clips. This significantly increases clip strength compared to horizontally printed designs, which often crack or fail during installation or repeated removal. I went through several design iterations before posting this, but please let me know if I missed anything and I will make adjustments if time permits.

Features

• Maintains full stock exhaust outlet surface area
• Redirects hot air downward without restricting flow
• Optimized for vertical printing to maximize clip strength
• Secure snap-on fit
• No supports required

Print Recommendations

• Orientation: Vertical (as designed)
• Supports: None
• Material: PETG minimum recommended
  • ABS, ASA, or other higher-temperature materials are preferred
  • PLA has not been tested and may soften or weaken over time due to continuous exposure to hot exhaust air (see notes below)
• Walls: 3+ perimeters recommended for durability

Material Choice Notes

This part is exposed to continuous hot air during certain printer operations, especially when running higher-temperature materials. Material choice is important for long-term reliability. The design also relies on a small amount of flex preload to prevent movement caused by machine vibrations. If the material softens or relaxes over repeated heat cycles, the part may lose retention and come loose during printing.