Z homing issue after Marlin firmware update

I recently decided to update my Prusa i3 to the latest Marlin firmware (it was on Oct 2013 build). I made all the config changes in the configuration.h file for my old settings. Everything is working from what I can tell as it should except for when I home the Z axis. It just hummed until I turned the trimpot up to about 60% (which seems like way too much and motors hum loudly at idle now). If move the Z axis up and down in Pronterface (not homing), they travel just fine without any humming... It is confusing. The homing speed for the Z axis is set at 240 just like I had it before...I using a mechanical endstop at the Z min just like before...

I uploaded a video to help show the issue: [www.youtube.com]

Any ideas?

I know Marlin recently added Auto Bed Leveling into the code and I'm wondering if that is causing the issue but I made sure it is off in the configuration.h file.

Edited 1 time(s). Last edit at 01/13/2014 10:06PM by pcchameleon.

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Prusa i3
Greg Wade v5 Extruder
Jhead hotend
Ramps 1.4 using Marlin

There may be homing acceleration in Adv_config.h, I dont quite remember but I know there were a few different settings located there.

I went through configuration.h and configuration_adv.h thoroughly but I can't find anything that would cause this. I reverted back to the Oct 2013 build I have on file and the Z homing is working correctly again...so I dont know...

Maybe .. maybe not.. but i see you have safe z homing defined in the auto bed leveling.. could maybe be the cause.

I believe Marlin has settings to disable the Min and Max endstops separately.

I have read somewhere that the RAMPS board has links to select between Min and Max endstops. It might just be a case of ensuring the links select Min endstops and that Max endstops are disabled in Marlin.

Regards,
Neil Darlow

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I try to write with consideration for all nationalities. Please let me know if something is unclear.
Printing with Mendel90 from fedora 25 using Cura, FreeCAD, MeshLab, OpenSCAD, Skeinforge and Slic3r tools.

cat.farmer,

I initially commented out everything under the auto bed leveling section and when I got this weird issue I went in just commented out the auto bed leveling line. With the feature commented out all of the ifdef lines shouldnt do anything....

that is wahat I thought, but it seemed odd to me to have everything commented out but that line. still working on my coding skills, in arduino, I was a PIC assembly guy before I built my printer. t

Quote
pcchameleon
I recently decided to update my Prusa i3 to the latest Marlin firmware (it was on Oct 2013 build). I made all the config changes in the configuration.h file for my old settings. Everything is working from what I can tell as it should except for when I home the Z axis. It just hummed until I turned the trimpot up to about 60% (which seems like way too much and motors hum loudly at idle now). If move the Z axis up and down in Pronterface (not homing), they travel just fine without any humming... It is confusing. The homing speed for the Z axis is set at 240 just like I had it before...I using a mechanical endstop at the Z min just like before...

I uploaded a video to help show the issue: [www.youtube.com]

Any ideas?

I know Marlin recently added Auto Bed Leveling into the code and I'm wondering if that is causing the issue but I made sure it is off in the configuration.h file.

Having exactly the same issue. Did you find a fix?

Hallo

so i found where is problem
here:

//// MOVEMENT SETTINGS
#define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
#define HOMING_FEEDRATE {50*60, 50*60, 3*60, 0} // set the homing speeds (mm/min)

change in config your homing feedrate :-)

good luck
is it true or false?

The thread started 18 month ago.... He sure has a working printer now
But you are right, z-speed default is set too high in Marlin for the average prusa i3. I reduced mine from 5 to 3 for normal printspeed and 2 for homing.
-Olaf

hohohooo before 4 month he didn´t hnow where is problem :-)
look there [www.youtube.com]


but my servo is still so hot :-/
So sorry, my english isn´t good
Good bye from Czech Republic