[setup] Z axis direction

[xenojimmy]

hello everybody from sunny Naples, Italy,

i’m glad to tell that finally my Morgan has seen the light, but it’s still a little bit faded..

the mechanics look solid
psi and theta move like charm, the calculated step/mm values differ from measured ones just by 0.26 (192.74)

I’m not sure if my Z axis setup is correct

-straight to the point:

in pronterface when u send a Z +0.1 , +1 or +10 (using buttons interface) what direction ur bed moves?? mine: +10 -> lowers 10mm

-some more details:
seems to be ok since Z homes to the right direction.
( INVERT_Z_DIR true
Z_HOME_DIR 1)

the real issue is that when I print the bed doesn’t move at all….

for instance,
when it starts printing, the bed goes up close to the hot end, positive Z values shouldn’t let it go over software endstops, indeed it doesn’t.

is this a problem related to Cura setup rather than a wiring/configuration failure?!!?

thanks for any reply, I’d like to complete my guide for arduino/ramps setup as it would be easier to know some stuff before building this printer 😉

[Quentin Harley]

Hi Jimmy,

It looks like the Z directions are correct. +10 literally means 10mm more space between the nozzle and the bed. So, that works fine. If you can successfully jog the bed up and down with the buttons I suspect a cura setup problem. I just don’t know what it may be.

Check the Software setup page

There is a cura profile for use on the Morgan Pro… Should be perfect for your machine.

[xenojimmy]

well that setup file was already loaded in Cura.

since I suspected that the Z motor was spinning in the wrong way I expected that inverting Z direction putting a “-” on each instance using a code editor could work…

but it didn’t indeed..

although i’m using a standard threaded bar (8mm) the step value looks to be ok, it moves exactly 1mm or 10 jogging with buttons.

my only modifications to the code are about the maximum Z feedrate: 6mm/s otherwise the motor hangs and gets stuck.

speed movements in Cura are set to 6 for all the axis for this reason, that’s quite annoying cos when the hotend moves on already printed parts tends to melt them again.

at this point I guess this could be related to the moving problem.
as I see that many people posted videos of simlar working setups I’m sharing mine hoping into an enlighting advice.

my setup for Z axis is:

DRV8825 DIV:1
Zstep: 147
8mm threded bar coupled with the mount included in the parts folder.
max feedrate: 6mm/s

thanks all 🙂

[Author]

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