Made with DB15 instead of DB26 because I couldnt find it easily here, it have enough pins for me by now.
I'm not sure if it is a good practice, but I'm using the shield as general ground.
I used 3 pins for 12v.
2 pins for heater switched ground.
4 pins for extruder motor
1 pin for thermistor
1 pin for laser PWM
Upgraded RepRap Prusa Mendel