Fanbuddy for Sunlu S2
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Fanbuddy is a non-destructive addon for the Sunlu S2 Filament Dryer to help extract humidity.
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- Printables
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- Accessories
- Licencja
- Creative Commons — Attribution — Noncommercial
About
Why ?
The Sunlu S2 Filament Dryer does not have a fan that helps in extracting humidity from the filament chamber.
I was looking for a non-destructive addon like this
but wanted to use some components I already owned. Another motivation was to improve my FreeCAD-Skills so I decided to design one myself.
What ?
A 3d printable, modular case with stackable layers that are screwed together and fixiated in their rotation via the end-cap. The fan, the D1 Mini Pro, the MP1548 and the HTU21 sensor are press-fitted. The models provided here print well on my MK3S+ but a future version of this case should have some sort of tolerance-independent mounts.
In addition to the models, there is Arduino code that currently connects and reports temperature and humidity to a MQTT-Server and is controlled by HomeAssistant. The arduino code and the MQTT-Entities for HomeAssistant can be found here:
Some notes regarding the code:
- OTA with password and MDNS is enabled since the case doesn't provide access to the D1's MIcro USB-Port. If you decide to run you own code, you might want to copy-paste the OTA stuff.
Another thing to consider is that the Arduino IDE currently doesn't allow to manually add a OTA-Host if discovery fails. I recommend testing OTA in your network before finally assembling the Fanbuddy.
How?
Parts
- 1x AZ Delivery D1 Mini Pro
- 1x AZ Delivery GY-21 HTU21
- 1x DollaTek MP1548EN DC-DC 3A Step-Down Converter
- 1x 5V DC 3010 Fan
- 1x NPN S8050 Transistor
- 1x 1K Ohm Resistor
- 6x M2x6 Screws
- (I used these: https://www.amazon.de/-/en/gp/product/B08MTY3NFF )
- 6x M2x3x3.2 (or 6x M2x2.5x3.2)
- (I used some of these: https://www.amazon.de/-/en/dp/B09B7F2XM3)
- 1x 5.5x2.1mm 24V DC Splitter Cable ( Female to 2-Male ),
- You might want to use a set like this: https://www.amazon.de/-/en/Eleidgs-Camera-Female-Splitter-Adapter/dp/B01KCOEOBO or/and make sure, that the Y-cable-arms are long enough so that the dryer can be opened without pulling the plug
- 1x 5.5x2.1mm female socket plug, open end cable, like in this set:
Wiring
- Adjust the output voltage of the step-down converter before soldering wires to the OUTPUT pads. It is recommended to add a capacitor (e.g. 10µF) in parallel on the output side (yet I did not use one).
- I've added a fritzing screenshot - wiring this up should be quite easy, make sure to protect the D1 pin that controlls the PNP transistor with (at least) a 1 kOhm resistor.
Printing
- Sliced with “0.3 Quality” settings in prusa slicer
- Printed with a 0.6 ø nozzle and PLA (not very pretty, but good enough for me)
Assembly
- Insert the 6 threaded inserts with your prefered tool
- Solder the input pads of the mpu1548 to the femail socket plug cable.
- Build the insides from the bottom-up:
- install the fan, pull the cables up through the holes
- put the mpu548-plate on top of the fan and secure with screws
- insert the sensor board with the sensors oriented down into the fan chamber
- add the d1 plate on top, secure with screws
- put the outer shell from the top over the little tower you've just build.
- choose the wanted orientation for the mounting nozzle and put on the endcap
- You can now choose to use connectors or solder everything directly to the components