Discovery wiring to Mendel 3 Rep Rap


#1

Hi to everybody!
My name is Mariglen from Rome, Italy. I have recently bought Discovery and trying to connect it with my Mendel 3 3D printer(Rep Rap). After I have been assembling Mendel 3 and fixing it, I try to connect and fix Discovery extruder, but with no success.
First of all, I wire it up but I am not sure if it is correct or not. Discovery has 4 wires black, green, blue and red instead the colors of my 3D printer are different and are put in that order from the top: yellow, green, blue and red. I am showing you a photo of the duet and I would like to have your suggestions if there is something wrong.


Any suggestion is appreciated and helpful.
At the beginning I used Pronter Face to connect to the discovery, which it was impossible to find the discovery. Then, I jumped to Repetier that was able to find the discovery and communicate with it. Here, the problems come. The motor does not rotate and I have found that it is a problem of the speed of the motor, which I tried to increase it by taking many parameters into account. First, I decreased the ‘size of the filament’ but nothing. Second, I decreased the diameter of the nozzle and nothing. I use Cura and here there are some screen shots of the software parameters. I have not put any past into the syringe during the tests. I do not know if it effects them or not.

Finally, I increased the EEPROM of the motor with commands on Repetier. I tried many commands that I am attaching to you by changing the values of E into the command M92 E[….], but nothing anyway. I do not know what to do anymore. After I put all the commands I wait for the printer responding to me and to what I have understood the motor receives the current and I hear a clicking sound from the motor, but the gears are not moving. So, I do not know if there is a problem of high or low power to the motor. Here in the attached file, there are all the commands that I have inserted.


#2

Hi @Mariglen_Angjellari,

One of the first suggestions I am going to make is to change the wiring to RED/BLUE/BLACK/GREEN. The wiring pairs in the NEMA motor are RED / BLUE and GREEN / BLACK.

Everything else you are doing seems correct.

Are you able to tell me the version of your electronics board? It should be printed on the PCB somewhere.

I am going to make sure you get printing successfully!


#3

Thank you for your kind reply!
I changed the wiring and I am not able to hear any noise that comes from the motor. In addition, I could not rotate the upper rod manually with my hand (before I was able to do it, now it becomes harder and the motor is blocked).


Regarding the versions of my electronics board: It is exactly the same as the board in this link: https://reprappro.com/shop/components/duet-pcb/
At the end, I am still unable to rotate the motor even by putting commands that correspond to high EEPROM. I repeat again, I am carrying out tests with no pastes in the syringe. First lets rotate the motor and then testing the real pastes.
Thank you again
Looking forward hearing from you
Mariglen


#4

Can you take one step back and try a normal nema17 motor? Verify this works first.


#5

Thank you!
It works with the extruder of Mendel 3 Rep Rap and I do not understand why it is so difficult to find a solution. Could you suggest any other external wiring to connect with the Duet?
In addition I am confused regarding colors, because on your manual is written:

.
I think that the colors of Rep Rap are those in the middle, aren’t they?
Thank you


#6

We found the problem. We managed to connect the motor of discovery with another mini duet in order to amplify the current that enters into the motor. Obviously, i can have only a manual control of the feed rate of the discovery. So, my printer duet is not enough to feed with current discovery motor.
Thank you for your time


#7

Glad to hear you have found a solution.

Checking out the page for the Duet board, it states that it uses A4892 drivers with 2A current, which should be plenty for the Discov3ry. I am still curious why it was not working.

Did you try using Slic3r instead of Repetier Host to adjust the EEPROM (M92) values?

Try also:

G0 Y100 F100

to extrude small amounts.


#8

Hi!
Probably the current is ok, but I donot understand why it is not working. Anyway, I feel perect with the way I fixed the problem. I will publish also other news in the future regarding printing of new materials. I think that it is a problem regarding the communication between Discov3ry and some types of Duet. Probably it is related to the quality of the 3D printer
All the best


#9

Thanks @Mariglen_Angjellari