Prusa MMU2s F.I.N.D.A. Troubleshooting aid

thingiverse

###Prusa MMU2s [F.I.N.D.A.](https://help.prusa3d.com/en/article/finda-setup-and-troubleshooting_2250) (filament detection) Troubleshooting aid The best way to quickly troubleshoot what is going on in a machine is to have all sorts of indicators at different stages of the process. After adding the wonderful [MK3s+MMU2s Filament Indicator Cover](https://www.prusaprinters.org/prints/2139) from [Mykal451](https://www.prusaprinters.org/social/7969-mykal451/prints) I thought it would be very interesting to have another one for the FINDA sensor. The sensor has an embedded LED but is not bright enough in my opinion. I tried to find a design specifically for the F.I.N.D.A. sensor with no luck, so I decided to create one myself. ####I used some electronics I had around: * 2 x 3 pin header (connection to the board and FINDA) * 470 Ohms resistor * 12k Ohms resistor * BC548 Transistor (general purpose transistor) * 2 pin header (connection to LED) * green LED * misc. wires * PCB Basically the board splits the FINDA sensor connector, so the sensor and a simple on/off circuit can operate an LED in parallel. This LED then can be mounted for example at the sensor itself using the design posted. The sensor sets its signal (black wire) to 1 when the filament is detected. I could have just connected a resistor an LED to the signal, but I rather spend 10 more minutes and isolate the signal just in case. Enjoy!