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

thingiverse

The Prusa MMU2s FINDA sensor is a critical component of the Prusa F.I.N.D.A. setup and troubleshooting aid. To quickly diagnose issues with the machine, it's essential to have multiple indicators at various stages of the process. After installing the MK3s+MMU2s Filament Indicator Cover from Mykal451, I realized the need for another indicator for the FINDA sensor. Although the sensor has an embedded LED, its brightness is inadequate in my opinion. I attempted to find a design specifically for the F.I.N.D.A. sensor but was unable to do so. Therefore, I decided to create one myself using available electronics. The components used include: * 2 x 3 pin headers (for connection to the board and FINDA) * 470 Ohm resistors * 12k Ohm resistor * BC548 Transistor * 2 pin header (connection to LED) * Green LED * Misc. wires * PCB The board splits the FINDA sensor connector, allowing the sensor and a simple on/off circuit to operate an LED in parallel. This LED can be mounted near the sensor using a posted design. When the filament is detected, the sensor sets its signal (black wire) to 1. I could have connected a resistor and LED directly to the signal, but instead chose to spend extra time isolating the signal for added safety. Enjoy!