Hello Roxy,
yes the nozzle has 185°C as I test the extruder. I also have test it with cold nozzle but then the stepper motor became no power (cold extrusion protection).
The potentiometer have I adjustet to 0,92V I have calculated this with this formula Vref = Imax x 0.7 x (8 x Rs) where Imax is the max. current your motor have 0,7 is for savety only 70% of the max. current, 8 ist the faktor for the A4988 driver and Rs is the resistor on your pololu-board in my case 100 Ohm.
All the other stepper motors works fine with this and the extruder motor is without fillament so it have no tourque on it.
But I have also raised and reduce the current with the potentiometer but the motor don't move.
How can I use the second extuder port on the Ramps-Board maybee there is an issue on the Board?
Regards Andre
yes the nozzle has 185°C as I test the extruder. I also have test it with cold nozzle but then the stepper motor became no power (cold extrusion protection).
The potentiometer have I adjustet to 0,92V I have calculated this with this formula Vref = Imax x 0.7 x (8 x Rs) where Imax is the max. current your motor have 0,7 is for savety only 70% of the max. current, 8 ist the faktor for the A4988 driver and Rs is the resistor on your pololu-board in my case 100 Ohm.
All the other stepper motors works fine with this and the extruder motor is without fillament so it have no tourque on it.
But I have also raised and reduce the current with the potentiometer but the motor don't move.
How can I use the second extuder port on the Ramps-Board maybee there is an issue on the Board?
Regards Andre