Creality CFS Active Dryer Mod - Sunlu S1 Plus "Drawer Style" Conversion

[MOD] Creality CFS Active Dryer & Desiccant Tray (Sunlu S1 Plus Conversion)

Overview: Why your CFS needs this Mod

The Creality CFS is a fantastic multi-material system, but it is purely passive. If you print with hygroscopic filaments like PETG, Nylon, or TPU, humidity remains a constant threat.

This hybrid design adds a 48W active heater and a custom Desiccant Tray. The heat from the element constantly regenerates the silica gel, keeping the internal air bone-dry and warm. Thanks to the "Drawer-Style" mechanism, you can slide the tray out for maintenance or silica refills in seconds without disassembling the CFS unit.

🚀Key Features

• Modular Printing: The 11.5" tray is designed in interlocking sections, allowing it to be printed on standard-sized machines like the Creality K1.

• Quick-Access Drawer: Features a rail system so the tray slides in and out easily for silica maintenance.

• Optimized Airflow: Reuses the original Sunlu fan mounted on the top lid, creating a convection loop that pushes air directly toward the heating element.

• OEM Aesthetics: Specifically designed to reuse the original Sunlu LCD screen cover and screws for a professional, factory-integrated look.

🛠 Materials

• Electronics (Harvested from Sunlu S1 Plus):

  • Mainboard & LCD Screen (Reuse the original plastic cover).

  • Semicircle Heating Element (Must be flattened to ~11.5" / 29.2cm).

  • Original 24V Fan.

  • Original Screws (4 for the PCB, 4 for the heater element).

• Extra Components:

  • Thermistor: 100K ohm NTC 3950 (Required as the factory cable is too short).

  • Wiring: 1.25mm 2-Pin Terminal Wire.

  • Adhesives: Art3d Double-Sided Mounting Tape and Cyanoacrylate (Super Glue).

• Tools: Soldering iron and an Aleric Step Drill Bit (crucial for clean holes in the CFS plastic).

Assembly & Installation Notes

1. Printing: ASA or ABS IS MANDATORY. PLA/PETG will warp or melt near the heating element. Join the modular tray parts using Super Glue.

   

2. Heater Preparation : Carefully flatten the heating element to 11.5 inches so it fits the inner perimeter of the printed enclosure and fill with silica looks lustrate. 

   

   

3. Active Airflow: Mount the Sunlu fan in the center of the CFS top lid, facing downward. This ensures air is pushed toward the heater for maximum efficiency.

4. Wiring : Route cables through the designated slots. Proper orientation prevents interference with filament spools.

   

   

5. Thermistor Swap: Desolder the original thermistor and install the new NTC 3950. Place the probe near the heater for accurate PID control.

6. CFS Modification: Use the step drill bit to create clean entry points for the wiring to the back of the unit.

🔥 Critical Print Settings:

        •Material: ASA or ABS ONLY. The internal heat will melt PLA or PETG.

        •Walls: 4 perimeters for structural strength.

        •Supports: Minimal supports needed for the drawer bridges.

        •Assembly Tip: The fan must be mounted in the top-center cover, facing down 

         towards the heating element to ensure proper air circulation across all 4 spools.

⚠Safety Disclaimer⚠

This modification involves mains voltage components and heating elements. Perform at your own risk. Ensure all electrical connections are properly soldered and insulated.

**** UPDATES ****

• Added missing parts for the slide mount on top of the original CFS design to correct the mounting angle issues.

• Added: Active Drying Logic

  • Heater ON (Drying Phase): Keep the plug OPEN. This allows the hot air to carry the evaporated moisture out of the CFS unit, ensuring the filament actually dries rather than just sitting in hot, humid air.

    

  • Heater OFF (Storage Phase): Keep the plug CLOSED. Once the drying cycle is done, seal the port to prevent external humidity from entering the unit as the air cools down.

********BETA****** NO TESTED 

• Added: Better Fit & Simpler Assembly I’ve refined the design to make it more rigid and easier to build:

Improved Snap-Fit: Tighter profile.

• Single M3 Screw: Added a reinforced center

           point that threads directly into the plastic. No             nuts or brass inserts needed.

• Hardware Required:  1x M3 Screw

           Why it matters: The assembly  providing rock-solid stability even at 55°C.