I needed a led indicator, like what zzjlamb did : https://www.printables.com/fr/model/104680-mmu2s-ir-sensor-status-indicator
But for the Easy IR Sensor calibration system from Peter Larsen :
https://www.printables.com/fr/model/7789-mmu2s-easy-ir-sensor-calibration
We ordered some pcb made for this special need (from Seeed Studio, China) and here it is:
It works like a charm, without any modification on Prusa electronics or wires.
The BOM :
1 x 555 Timer
1 x 10 KOhm 1/4 W resistor
1 x 1 KOhm 1/4 W resistor
1 x 5mm Blue LED
1 x PCB - 20 mm x 10 mm
Feel free to use it for your own :-)
I can also sell the soldered PCB, ready to use for 14€. Contact me if needed.
EDIT 01/06/2023 : Gerber files added
EDIT 25/09/2023 : New design with front oriented led. old version is V5, new one is V6
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See my other models to have a complete and very usefull chimney :
PC4-M10 connector :
https://www.printables.com/fr/model/526250-pc4-m10-remix-for-mk3s-mmu2s-precise-calibration-c
M2 Insert :
https://www.printables.com/fr/model/593381-m2-insert-remix-for-mk3s-mmu2s-precise-calibration
The author remixed this model.
Added a new pcb for the led, and a cover