4

After a long time tweaking my new 3D printer I solved all the unexpected errors and I can print succesful pieces but I am facing a "problem", they are over sized, I found this problem trying to print a Raspberry Pi Case and an smartphone case, the printed pieces are bigger than the objects.

Here some related information

Printer: Geeetech Prusa i3 Pro B

Firmware: My GitHub (Marlin)

Software: Repetier Host with Slic3r

Does somebody know how could I solve it? Thank you very much

Alberto Méndez
  • 163
  • 5

2 Answers2

3

You have to know:

  • distance between belt teeth (usually 2mm)
  • number of teeth on pulley
  • motor step angle 1.8 deg?
  • microstepping count, probably 16?

Then you can enter all these numbers info the calculator here: https://www.prusaprinters.org/calculator/

Gunslinger
  • 702
  • 5
  • 12
2

I finally solved it by manually adjusting the steps per unit in the printer firmware.

The process is easy just move the extruder to one position and draw two marks, one at the extruder position and another one 10 cm in the X axis from the extruder position then with Repetier or with the the printer controls move the X axis 100 mm, if the extruder stops after the mark reduce the steps per unit or increase them if the extruder stops before the mark, do until the movement matches both marks. Repeat for the Y axis.

You can see the changes I made to the firmware in my GitHub

Alberto Méndez
  • 163
  • 5