I have my reprap prusa mendel i2 running well, except for the extruder calibration. I've been trying to get the extruder calibrated, but no matter what I change the steps per mm to in sprinter, I can not get the amount fed to change. It is always 5mm when I ask for 10mm. I've changed the config.h file to reflect different setting (and uploaded successfully), and I still get 5mm when asking for 10mm. I'm not sure where to look for the problem. I'm assuming the extruder may be slipping, but I do not know how to tell. How many mm is one revolution of the bolt in the extruder? If I ask for 10mm and only got 5mm, the math looks like this. 10mm = 700 steps/mm *10mm =7000 steps. So the controller sent 7000 steps. The measured amount extruded was 5mm. so 7000steps/5mm =1400 steps/mm. So I change it to 1400 steps in config.h upload using arduino software, then I go to pronterface and ask it to extrude 10mm (at temp), at 40mm/min rate, and it still does 5mm!!! Any tips would be great. thanks, p.s. My first clue that something was wrong was the models I printed, had hollow walls and incomplete fill. I'm guessing this is because the extruder is not putting out enough to fill it in. https://reprap.org/forum/read.php?4,271528,271528#msg-271528 Sat, 14 Mar 2026 03:59:58 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,271528,271553#msg-271553 https://reprap.org/forum/read.php?4,271528,271553#msg-271553
Also the Reprappers section is to discuss "people using and building repraps" as the title says not for discussing technical stuff. There are specific sections for all types of technical questions.]]> Sublime Reprappers Sun, 24 Nov 2013 22:38:20 -0500 https://reprap.org/forum/read.php?4,271528,271547#msg-271547 https://reprap.org/forum/read.php?4,271528,271547#msg-271547 uncle_bob Reprappers Sun, 24 Nov 2013 22:04:18 -0500 https://reprap.org/forum/read.php?4,271528,271546#msg-271546 https://reprap.org/forum/read.php?4,271528,271546#msg-271546
Why isn't it updating when I upload it in the arduino software. Do I have to hit a reset button or something? I updated the config.h file to reflect more steps per mm, but it doesn't work...]]> sciome Reprappers Sun, 24 Nov 2013 22:02:23 -0500 https://reprap.org/forum/read.php?4,271528,271540#msg-271540 https://reprap.org/forum/read.php?4,271528,271540#msg-271540
[reprap.org]]]> waitaki Reprappers Sun, 24 Nov 2013 21:28:18 -0500 https://reprap.org/forum/read.php?4,271528,271528#msg-271528 https://reprap.org/forum/read.php?4,271528,271528#msg-271528
I've been trying to get the extruder calibrated, but no matter what I change the steps per mm to in sprinter, I can not get the amount fed to change. It is always 5mm when I ask for 10mm. I've changed the config.h file to reflect different setting (and uploaded successfully), and I still get 5mm when asking for 10mm.

I'm not sure where to look for the problem. I'm assuming the extruder may be slipping, but I do not know how to tell. How many mm is one revolution of the bolt in the extruder?

If I ask for 10mm and only got 5mm, the math looks like this. 10mm = 700 steps/mm *10mm =7000 steps. So the controller sent 7000 steps. The measured amount extruded was 5mm. so 7000steps/5mm =1400 steps/mm. So I change it to 1400 steps in config.h upload using arduino software, then I go to pronterface and ask it to extrude 10mm (at temp), at 40mm/min rate, and it still does 5mm!!!

Any tips would be great.

thanks,


p.s. My first clue that something was wrong was the models I printed, had hollow walls and incomplete fill. I'm guessing this is because the extruder is not putting out enough to fill it in.]]> sciome Reprappers Sun, 24 Nov 2013 20:32:59 -0500