Hello All, I am building my own 3D Printer - Graber i3.

3D Printing
,
1

Hello All,

I am building my own 3D Printer - Graber i3. I have followed all the necessary steps to configure the Marline firmware.

I am using the Ramps 1.4 controller board and the A4988 driver. The stepper motor I am using for X, Y and Z axis has 1.8-degree step angle.

I have used the Pursa Calculator to calculate the steps for X, Y, and Z axis - 80, 80, 1600 based on the GT2 pully-belt and 2mm threaded rod - screw system.

ISSUE:

  • When I am using the calculated steps for the X, Y and Z axis I am observing higher movement (i.e 10-15 mm when I want to move 1mm)
  • I have calibrated the movement by reducing down the calculated steps -
    now the new steps are X=6.5, Y= 6.5 and Z = 26.66
  1. My question is why I am getting such a lower steps per axis?
  2. How can I get more accurate movement without skipping/slipping of the motor?

Please help

Thank you

Kunal

2

Do you have all three jumpers installed under the driver?

3

@Justin_Nesselrotte No I do not have any jumper installed.

4

Double check that your microstepping value matches what’s in the firmware. With all 3 jumpers installed, it’s 16x microstepping, which I’d recommend. Most likely, the firmware thinks it’s 80 microsteps to go 1 mm at 16x microstepping. Since without jumpers you’re at 1x, your firmware says “step” 16x more than it needs to.

Tl;dr, add the jumpers, and set it to the original values in the firmware

5

thank you Justin, I was not installing the jumpers, I never knew about them in first place.

I have installed the jumpers and now I am getting the actual steps per mm as from Pursa Calculator.

The noise is gone and my printer is working seamlessly.

Thank you very much for the help Justin.

6

No problem at all, happy to help!