FilaDryer S1 Fan Duct with automatic switch
Description
The Sunlu FilaDryer S1 is an economical way to get a filament dryer, but not a great performer out of the box. As the heat is concentrated at the heating element at the bottom of the dryer, it's normal to see temperatures 15-20C cooler at the top of the dryer. Unless you rotate the filament roll often, you will likely have uneven drying. Adding a fan to the Sunlu FilaDryer S1 vastly improves the performance of the dryer by evenly distributing heat throughout the dryer. I initially printed MidLifeHiker's great design, but my 40x10mm fans did not fit - most appear to be closer to 11mm thick! I completely replicated the fan housing in Fusion360 to allow for the thicker 40x10mm fans. As MidLifeHiker mentioned, you don't need a lot of air movement, a quiet 40x10 fan works perfectly - I can barely hear it. I used a 24VDC fan so I could power it directly from the dryer's power supply, inside the enclosure. Unfortunately this means the fan will run whenever the dryer is connected to the power supply, so I used a KSD-9700 40C normally open thermal switch (as shown in picture above) to power on the fan only when the temperature inside the dryer exceeds 40C. Works like a charm. The one wire of the thermal switch is soldered to the POSITIVE terminal of the 24VDC power inlet, and the other wire to the POSITIVE (red) wire of the fan. Refer to the wiring diagram in the pictures above. The 40x10mm fan slides into the duct, airflow facing down into the dryer, with the supply wire routed into the slot. I used double sided tape to mount the duct inside the clear dryer cover. A little disassembly is required to connect to the power inputs. Look for Youtube videos on how to take apart the dryer. To disassemble: * Disconnect the dryer from the power source! This should be obvious... * Remove the 2 roller shafts inside the dryer * Remove the front panel and display PCB, then disconnect the 2 pairs of wires connected to the curved metal shield inside the dryer * Remove the 4 screws holding the metal shield * Remove the shield * Peel back the foam tape at the bottom rear of the dryer to get access to the power connector * Solder as shown in the diagram
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