Solved Z axis printing too short.

First of all, thanks for any support.

I bought an R1 a week or two ago, and have been very pleased with it.

I have not made any modifications to it, and am running it exactly as it came out of the box.
I am using Hatchbox PLA fresh from it's sealed bag.
Bed at 60, extruder at 210. No coating or tape on the glass bed.
Other settings vary, as I experiment with what seems to work, and what doesn't.

I drew a simple servo bracket in Sketchup v8 and saved it as an STL.
I opened the file in Cura 14.12.1.
If I print the file flat, it is proper, and the servo fits properly.
If I rotate the file 90 degrees and print it vertically, the opening is not wide enough, as if the Z-Axis is not moving up quite enough with each step.

In this photo, you can see the difference in size. This was the same file, only the left side was printed horizontally, and the right side was printed vertically, with support material in the opening.



I am not having any trouble with print QUALITY, I had the settings really loose, to test this. I am only concerned with the difference in the size, where the only change to the entire system was rotating the piece 90 degrees in Cura.

Is there a calibration procedure or other ideas anyone can point me to to correct this?

I have verified that I am using 8mm rods, per one post here, and verified the line:

#define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,2560,723.38} // default steps per unit for RoBo 3D R1

in the confiuration.h file as recommended here also.

Can anyone advise a solution?

Thanks a ton.

 

Well, that solved the problem if I'm using MatterControl so for now, that'll do it. In particular, the comment by @Jefferyfish on 9/5/14 helped.

There obviously is still a setting in Cura that I'm missing, since it still prints wrong there, but at least I have a new baseline to work with and compare notes.

Thanks Mark.

 

After the above steps, I deleted the machine profile in Cura and rebuilt it based on Mike's post here:

http://forums.robo3dprinter.com/index.php?threads/how-to-cura-setup.4169/

I had followed that one the first time as well, but now, with the revised numbers in the firmware, and a new profile built in Cura, I seem to have resolved all of the issue and 1 inch equals 1 inch.

I figured I'd post a followup, for the next person that may need it.

Thanks.

 

hello - the link below no longer goes to any forum post. any chance this solution is still on file somewhere? i'm having the same issue with my z-axis. thanks!

 

thanks for this - unfortunately when i go to configure the eeprom settings it tells me that there are no eeprom mapping for my printer's firmware.

 

i was able to get the EEprom settings in MatterControl up and changed the Z steps/mm to 2560 and its working great now (printing better than it ever has), but when i quit MC the value won't stick and i have to change it every time. i'll go through the steps of re-flashing the firmware. thanks so much for your help!