PolyDryer/SnapDryer Air Exchanger - Varible Flow

Optimize Your Filament Drying with the Adjustable Flow PolyDryer/SnapDryer Air Exchanger!

Polymaker made a wonderful filament dryer with the PolyDryer/SnapDryer but they weren't able to optimize the process. This design is inspired by extensive testing conducted by @gwg_2538727 on printables, which pinpointed the optimal air exchange rate needed to maximize moisture extraction from the PolyDryer/SnapDryer.

 

I wanted to design something that wasn't just a temporary attachment. I wanted to transform the Polydryer/SnapDryer into the ultimate drying machine! More than just a functional upgrade, this unit integrates seamlessly, maintaining the original aesthetic, preserving access to the settings sticker, and even adding an integrated home for the airlock caps. Most importantly, the adjustable vent allows you to fine-tune the air exchange from 0% to 10%, letting you choose the perfect, data-backed setting for every drying scenario. One size doesn't fit all, and now, your dryer doesn't have to be limited.

⚠️ Important:  Ensure build plate is cleaned properly and filament is dried. The tolerances on this model as designed with tight interference and clearance fits. 

My Current Settings

1. PLA
   1. Level: 1
   2. Back Vent: Closed
   3. Front Vent: 5% (smaller opening)
   4. PolyDryer Filament Tube Gaskets: Opened
2. PET-G
   1. Level: 2
   2. Back Vent: 5% (smaller opening)
   3. Front Vent: 10% (Bigger opening)
   4. PolyDryer Filament Tube Gaskets: Opened

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Features

• Precision Adjustable Airflow: Easily set the vent from 0% (closed) to 10%.
• Aesthetic Integration: Follows the original PolyDryer design language, featuring matching filleted corners and chamfered edges for a factory-installed look.
• Preserved Compatibility: The top vent holes are modeled to be exactly the same, ensuring compatibility with all your existing customized accessories and dry boxes.
• Integrated Cap Storage: Features a dedicated, built-in home for the original airlock caps when not in use.
• Settings Visibility: Ensures the PolyDryer's main settings sticker remains completely visible and accessible.
• No additional Hardware Needed: Detents and clips were designed into the model to ensure no additional hardward is needed.
• Aligned Seam

Specifications

• Compatibility: PolyMaker PolyDryer (Link)
• Filament Type: PETG or ABS Recommended for high heat resistance
• Air Exchange Settings: 0%, 5%, 10%
• Parts to Print: Main Body, 2 Vent pieces, 2 Scoops
• Dryer Height Increase: 19mm

Design Notes

• The 2 vent pieces are printed separately for multiple reasons:
  • Allow others to customize for different dry box designs and applications
  • Allow for printing with reduced support material
  • Allow for smoother surface finish on exposed parts. 
  • Allow for mixing up colors
• The vent pieces were designed to clip in securely with tabs to avoid additional hardware.
• Detents were added into the scoop sliders to give positive feedback when in the 0%, 5%, 10% setting.
• The calculations for the percent is as follows:
  • The area of the air flow opening is ~1387mm^2. (Base on a rectangle with rounded corners measuring: L = 65.5, W = 21.5, r = 5)
  • A scoop that is 28mm wide would have the following vent percentages/depths:
    10% = 5mm
    5% = 2.5mm
    0% = 0
• Supports were kept to a minimum and all areas that may look rough due to supports are hidden.
• The vent pieces look best with variable layer height. All other pieces are chamfered so none is needed.
• To avoid print lines, the original design uses 2 plates to allow for Print by Object. This greatly improves the finish. I have added a place with all parts combine for those who rather save time. 

Assembly Guide

Formal document will be released shortly.

1. After printing the parts, remove any support material.

2. To assemble the vent piece, tilt the piece to insert the tab. While gently squeezing the vent piece, place it flush into the vent hole. 

    

3. Repeat for the second vent. 

4. To assemble the air exchange scoop, ensure the scoop is faced downward and insert it in the scoop hole.

5. Set the scoop to the desired setting. The detents will lock the scoop in place but you can verify the alignment with the setting lines.
6. Repeat to install the second scoop. (Both Scoops to be facing down. On the back it is facing down so it can siphon air out. On the front, air is drawn into the system back into the base) 

7. For a more permanent installation, double sided mounting table can be placed where the arrow is marked. 

8. Place your Air Exchanger on top of the PolyDryer unit and you're all set!

    

Credits / Licensing

• Design by PixelFanLabs – With a curious mind, integrity, and your hands in the soil, you can create anything. 
• Based onTesting Data by @gwg_2538727 - Special Thanks to @gwg_2538727 for their contribution to the community.
• License –  All Rights Reserved
  • Personal Use Only: You may print this for your own use.
  • No Redistribution: Do not re-upload or distribute these digital files on any other platform.
  • No Derivatives: Modification of this design—including the removal of the engraved PixelFanLabs signature—is strictly prohibited.