Connecting multiple Z probes for multiple independent Z axis

georgepaul

Have you guys checked out the ZideX 3D printer.
Its awesome.

I thought i would build a similar one but with two probes to home each independent Z axis.

This calls for two probe pins that I believe the DuetWifi doesn't have. Does anyone know a hack around it? I am thinking of two inductive sensors for the two Z axis.

dc42

You have several options. To use the Z probe instead of multiple endstop switches, see https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors. To use multiple endstop switches if running RepRapFirmware 2, see https://duet3d.dozuki.com/Guide/Independent+Z+motors+and+endstop+switches/18?lang=en. Or if running RepRapFirmware 3 see https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview#Section_M574

georgepaul

@dc42 what about putting two probes for each Z?? is that possible??

dc42

@georgepaul said in Connecting multiple Z probes for multiple independent Z axis:

@dc42 what about putting two probes for each Z?? is that possible??

That doesn't make sense to me. You only need one Z probe. But some people use 2 endstop switches, one for each motor.

georgepaul

@dc42 since the extruders are independent, and z axis and x axis will also be independent. we will need two probes right?!

dc42

@georgepaul said in Connecting multiple Z probes for multiple independent Z axis:

ZideX

I think I see what you mean. That printer design has two independent extruders, each on its own X carriage, and the height of each X carriage is controlled by a separate Z motor. Correct?

In RepRapFirmware 2 you can switch between different types of Z probe using M558, and some types have their own G31 settings. RepRapFirmware 3 will be more versatile. You can already configure multiple Z probes in RRF3 (each with its own type and G31 parameters), all that's missing is a new M-code to switch between them.

With either firmware, you can use the tool change files to select the Z probe you want to use and to switch height maps.

georgepaul

what about on the hardware side... where can i put the additional probe pins?

dc42

@georgepaul said in Connecting multiple Z probes for multiple independent Z axis:

what about on the hardware side... where can i put the additional probe pins?

On Duet 2 you can connect digital-output Z probes to any endstop input as well as to the Z probe connector. On Duet 3 you can connect them to any of the nine IO_x connectors.

georgepaul

so even a capacitive probe, working on 12V will not harm the Duet if the signal pin of probe is connected to any endstop STP pin.

Veti

only on a duet2 v1.04 and up

georgepaul

mine says;

M115
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.0(RTOS) ELECTRONICS: Duet WiFi 1.02 or later + DueX5 FIRMWARE_DATE: 2018-06-05b3

so I guess it's not compatible!

Veti

@georgepaul

the firmware can not see which hardware revision you have, at those changes are independant of the firmware.

its printed on the pcb

georgepaul

ok then im safe... my hardware says Duet2 V1.04... yippie

georgepaul

Ok so i did connect a Zprobe and got it working. I made the following changes and it worked for the NPN inductive sensor that I scavenged.

I made the following wiring. I used the IN4007 because i dint have anything else on me.

The following config changes were done;

**; Endstops
M574 X1 Y1 U1 S0 ; Set active low and disabled endstops
M574 Z1 S2

; Z-Probe
M558 P1 I1 H5 F120 T6000
M557 X25:0 Y25:0 S20 ; Define mesh grid**

and it worked fine.

georgepaul

Then i tried using theProbe for the U axis and i made this tiny change in the config.g file;

; Endstops
M574 X1 Y1 Z1 S0 ; Set active low and disabled endstops
M574 U1 S2

And that too worked fine

georgepaul

my doubt is whether this can be done;

and if i wanted to connect two probes can one more be connected in the E0 endstop STP pin for the U axis?

georgepaul

i am just making sure i don't fry the board by doing something wrong