Z axis Stepper stalls after updating to the lastest Marlin (Config.h included)

I have just uploaded the lastest Marlin firmware to my Prusa Mendel i3 today,
and the Z-axis keep stalling when ever it moves.

With the previously installed Marlin installed, there was no problem at all

I looked up the Gcode and noticed that the speed for the Z axis are quite fast
Something like G1 Z0.300 F7200.000 / G1 Z1.500 F7200.000
Also noticed that the default custom gcode in slic3r has something like this -> "G1 Z10 F5000; lift nozzle"

Is this speed normal ?

But one thing I'm quite sure is that the old firmware works, because I then uploaded the old firmware to the board
and it works like a charm

Whats affecting this stalling issue in the new firmware ?

Please help, thanks in advance ~~~*

New_marlin_Configuration.h

Old_Configuration.h

Edited 1 time(s). Last edit at 07/05/2014 07:58AM by duckfriedrice.

I've just uploaded both the new and old firmware above.

Hope someone can help out , many thanks

The one time when my z motor stalled was when I had upgraded the physical z axis and the homing speed was to high for the load on the z axis.
So reduce the homing speed and maybe even half the number of microsteps.

From a quick look you do have different steps per mm for z axis in in the new config file

In your old config:

#define DEFAULT_AXIS_STEPS_PER_UNIT   {79.5, 79.5, 3142, 94}

In your new config:

#define DEFAULT_AXIS_STEPS_PER_UNIT   {79.5, 79.5, 4045, 94}

Yes sdavi

The 3142 was wrong, should be 4045 after calibration, but the stalling problem still doesnt work

Quote
duckfriedrice
Something like G1 Z0.300 F7200.000 / G1 Z1.500 F7200.000

This is nonsense. A good Z axis can achieve something like F600, or 10 mm/s. Many have to be limited to F120 or F180.

Marlin default speeds and accelerations are way too high. Limit acceleration to 1000 mm/s² and Z max speed to 3 mm/s. If this works fine you can raise these values again. And yes, I write this almost daily. Marlin developers simply don't listen to Teacup firmware developers.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

It took me a while to sort out my z stalling after firmware upgrade.
Thought I must have had some really poor motors given what the default settings were trying to achieve.

sorry, finally have the chance to get my hands into the printer again.

checked the speed setting in marlin for z axis
changed the z speed to 3mm/sec and the printer is working fine again

the z motors have not stalled from this change

but strange, im pretty sure the old marlin firmware works with 5mm/sec

Duckfridrice, I know this is a old topic, but I have to thank you for saving my day. 5 to 3 rocks.