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Z-Probe Problem confused smiley

Posted by Daanc 
Z-Probe Problem confused smiley
May 15, 2017 06:44PM
Dear RepRap Experts,

I got one of the first productions of the Omerod. This printer has been bought but it has never printed anything in all these years. I asked the owner if i could try to make it work, and it has been a bumpy road so far!
So i hope maby some of the experienced users can help me fix my problem!

The problem is when i try to home the z axis. This is measured by the Z probe and i have a very old one with 3 connectors. Before i start i type M558 P1(to activate probe) First i checked if the z probe was working correctly by taking measurements when it was at 40mm from the bed and the result was around 60. Then i moved the axis towards the bed and the value changed along the way untill i reached 987 at 0.7mm from the bed. I send in the G92 Z0 command and after that i set the the G31 Z1.4 P719 ( i tried different values).

The nozzle goes the the Z0 as it should do, but when i want to start the print after that it always crashes into the bed. When i restart my Ormerod and i want to home my Z-axis it crashes and the stepper keeps running. So it seems the calibration has no effect.

This is my Config file:

; Configuration file for RepRap Ormerod
; RepRapPro Ltd
M111 S0 ; Debug off
M550 PMy RepRapPro Ormerod ; Machine name (can be anything you like)
M551 Preprap ; Machine password (currently not used)
M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xED ; MAC Address
M552 P192.168.1.14 ; IP address
M553 P255.255.255.0 ; Netmask
M554 P192.168.1.1 ; Gateway
M555 P2 ; Set output to look like Marlin
G21 ; Work in millimetres
G90 ; Send absolute corrdinates...
M83 ; ...but relative extruder moves
M906 X800 Y1000 Z800 E800 ; Set motor currents (mA)
M563 P1 D0 H1 ; Define tool 1
G10 P1 S0 R0 ; Set tool 1 operating and standby temperatures
M92 E420 ; Set extruder steps per mm
M558 P2 ; Use a modulated Z probe
G31 Z1.4 P719 ; Set the probe height and threshold
M557 P0 X60 Y0 ; Four...
M557 P1 X60 Y165 ; ...probe points...
M557 P2 X222 Y165 ; ...for bed...
M557 P3 X222 Y0 ; ...levelling
M556 S78 X0 Y0 Z0 ; Put your axis compensation here
M201 X800 Y800 Z15 E1000 ; Accelerations (mm/s^2)
M203 X15000 Y15000 Z100 E3600 ; Maximum speeds (mm/min)
M566 X600 Y600 Z30 E600 ; Minimum speeds mm/minute

Can anyone help me with this one?

Thanks in advance!


Re: Z-Probe Problem confused smiley
May 16, 2017 02:58AM
The P2 parameter in your M558 command in config.g is for the 4-wire proximity sensor. Change it to P1 for your 3-wire sensor. Also make sure there are no M558 commands in any of the homing files.

Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Z-Probe Problem confused smiley
May 16, 2017 05:59AM
Hey dc42 Thanks for you help, its fixed right away! now i can continue to calibrate !
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