Solved Z not going high enough

I have been printing small items with no problem at all.
So I tried to print a taller file and once it reached like 2,5 inches the extruder bumps the object out of the bed, like it can't go upper.
I tried to print the same file twice with the same results.
I am not aure if the file is corrupted or if there is something wrong woth my Z axis.
It may be the first one because I can make it go higher with the Z+/Z- buttons in the software.
Thanx in advance for your answers

 

Under your eeprom settings what's your z steps per mm

 

I am having a similar problem. I set the z steps per mm to the 2560 that was suggested in other posts. When I printed a calibration part, .5 x 1 x 1 box, the x,y and z dimensions were less than .010 off. But when I try printing more complex parts that require a lot on/off of the extrusion head, the head movement knocks the small features off or wipes the supports away.

I am using:

PLA (blue that came with printer)
low resolution
default settings for temps
z offset 0.8 mm for bed)

I just got the printer a couple days ago so I have worked thru the following issues:

* z-axis scaling (saving to EEPROM doesn't stick after power cycling)
* x and y-axis belt tensioning
* checked set screw tightness on pulleys
* cleaned filament drive off and adjusted preload on follower bearing

Any help would be greatly appreciated.

Thanks,
Kirk

 

Tryed to print the same file for the third time, same results, the extruder knock the part out of the bed.




Edited for typos (sorry)

 

I found that entering a new scale factor didn't even stick while the printer was on, It would for a very small simple part like the calibration cube. So installing correct firmware is necessary. When the new firmware compiled in the arduino software, you have to follow the robo3d support page directions exactly. I didn't put the files in the arduino folder like the directions said, I navigated to folder I extracted to. It compiled ok, and set the z setting, but something didn't get connected so it still printed like it did before with a -20% scale factor error in the z-axis.

When I moved the files to the "sketch" directory, opened sketchbook, compiled and uploaded. The printer started printing much closer in the z-axis, though it seems to be about +6% scale factor error now. I just verified that this morning with a simple print. Looking forward to try a bigger part to see if the knocking features off and supports goes away now.

 

BTW, I verified the threaded rod size by using a 5/16-18 nut from Home Depot ($0.11). If it is a M8 x 1.25 threaded rod the nut will start and go 3/4 to 1 turn and then bind. Whereas a m8 x 1.25 nut will turn freely on the rod

 

Thanks Mark, I just got my R1 last week so I was under the impression that my firmrware was up to date, going to install the new one tonight. Thanx again

 

I have a little experience with an Arduino UNO (working with the R2 Builders club to make my own Astromech), this one must be just the same process.
Big thanx again.

 

Solved!

Thank you for your help