Hello everybody,
I am currently in the process of assembling a printer based on the i3. So far I have been able to solve the problems that arise myself.
Unfortunately, I'm not getting any further at the moment. I can't get the extruder running properly.
First I want to calibrate the extruder. For this I use cold extrusion and wanted to adjust the flow rate of the filament.
I have the following data for DEFAULT_AXIS_STEPS_PER_UNIT in the Marlin firmware (version 2.0.x): {4.98, 4.99, 250, 400}
I was able to adjust the X and Y axes using the principle of remeasuring between the actual and target value. With the Z-axis, however, the motor no longer runs with the calculated value (approx. 50). The motor for the extruder only runs reasonably with values between about 300 and 500.
However, far too much filament is being conveyed with these values.
Can someone help me, why this is or whether I can carry out the calibration in another way? For example, changing the print flow (in Pronterface) also reduces the conveyed length. If I change this to 20% it actually moves for the expected vale.
I also tried the extruder when it was heated (230-250 ° C for ABS). Even with the settings that are actually too high, the filament does not come out of the nozzle and clogs the hotend. Do you have any tips to prevent this?
Another strange note is the control of the extruder in general. I use Pronterface. Regardless of whether I control the extruder via the Extrude and Reverse buttons or via G-Code commands, the direction of rotation of the motor is not always the same. Above all, the motor rotates in the same direction on the extrude and reverse buttons.
Thank you very much for your support in my project.
I'm new here and don't know what are some basic printer information are necessary. So if you need further information let it me know.
greetings