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Re: Precision Piezo Z-probe Now available. August 07, 2021 07:19AM |
I finally have this working reliably, repeatably and very accurately with the latest Marlin firmware v2.0.9.1
(using RAMPS 1.4 board with DRV8885 stepper controllers, but almost any 3d pronter should work with the below config).
Thank you to the designers of this probe system
In case it helps anyone else, here are all of my configuration parameters that relate to this Z probe.
If you have a slower Z stepper driver you cannot use the Precision Piezo because it requires a minimum Z speed to work
I also had to reduce the sensitivity pot on the board to remove false positives (clockwise from above a small amount), and tighten all the screws to make the unit very stiff.
Marlin/Configuration.h
#define Z_MIN_ENDSTOP_INVERTING true
#define Z_MIN_PROBE_ENDSTOP_INVERTING true
#define DEFAULT_MAX_FEEDRATE { ?, ?, 20, ? } // set third parameter to 20, leave others at your choice
#define DEFAULT_MAX_ACCELERATION { ?, ?, 50, ? } // set third parameter to 50, leave others at your choice
#define NOZZLE_AS_PROBE
#define NOZZLE_TO_PROBE_OFFSET { 0, 0, 0.3 } // you may need to fine tune the third parameter for your machine, using M851Z?
#define Z_PROBE_FEEDRATE_FAST (20*60)
#define Z_PROBE_FEEDRATE_SLOW Z_PROBE_FEEDRATE_FAST
// add these two lines directly after Z_PROBE_FEEDRATE_SLOW
// pause before Z probing to prevent movement jerk causing a false z probe positive, in milli-seconds
#define Z_PROBE_PAUSE_INTERVAL_MS 500 // see also src/module/probe.cpp line 602...
#define Z_CLEARANCE_MULTI_PROBE 10
#define Z_AFTER_PROBING 5
#define MIN_SOFTWARE_ENDSTOP_Z false
// Now you can enable auto bed levelling if you like:
#define AUTO_BED_LEVELING_BILINEAR
#define RESTORE_LEVELING_AFTER_G28
#define DEBUG_LEVELING_FEATURE
#define Z_SAFE_HOMING
#define HOMING_FEEDRATE_MM_M { ?, ?, (20*60) } // set third parameter to (20*60), leave others at your choice
Marlin/src/probe.cpp
Add these 8 lines at line 601 (just below "if (TERN0(PROBE_TARE, tare())) return true;"):
#ifdef Z_PROBE_PAUSE_INTERVAL_MS
if (Z_PROBE_PAUSE_INTERVAL_MS > 0)
{
millis_t time = millis() + Z_PROBE_PAUSE_INTERVAL_MS;
while (millis() < time)
idle();
}
#endif // Z_PROBE_PAUSE_INTERVAL_MS
(using RAMPS 1.4 board with DRV8885 stepper controllers, but almost any 3d pronter should work with the below config).
Thank you to the designers of this probe system
In case it helps anyone else, here are all of my configuration parameters that relate to this Z probe.
If you have a slower Z stepper driver you cannot use the Precision Piezo because it requires a minimum Z speed to work
I also had to reduce the sensitivity pot on the board to remove false positives (clockwise from above a small amount), and tighten all the screws to make the unit very stiff.
Marlin/Configuration.h
#define Z_MIN_ENDSTOP_INVERTING true
#define Z_MIN_PROBE_ENDSTOP_INVERTING true
#define DEFAULT_MAX_FEEDRATE { ?, ?, 20, ? } // set third parameter to 20, leave others at your choice
#define DEFAULT_MAX_ACCELERATION { ?, ?, 50, ? } // set third parameter to 50, leave others at your choice
#define NOZZLE_AS_PROBE
#define NOZZLE_TO_PROBE_OFFSET { 0, 0, 0.3 } // you may need to fine tune the third parameter for your machine, using M851Z?
#define Z_PROBE_FEEDRATE_FAST (20*60)
#define Z_PROBE_FEEDRATE_SLOW Z_PROBE_FEEDRATE_FAST
// add these two lines directly after Z_PROBE_FEEDRATE_SLOW
// pause before Z probing to prevent movement jerk causing a false z probe positive, in milli-seconds
#define Z_PROBE_PAUSE_INTERVAL_MS 500 // see also src/module/probe.cpp line 602...
#define Z_CLEARANCE_MULTI_PROBE 10
#define Z_AFTER_PROBING 5
#define MIN_SOFTWARE_ENDSTOP_Z false
// Now you can enable auto bed levelling if you like:
#define AUTO_BED_LEVELING_BILINEAR
#define RESTORE_LEVELING_AFTER_G28
#define DEBUG_LEVELING_FEATURE
#define Z_SAFE_HOMING
#define HOMING_FEEDRATE_MM_M { ?, ?, (20*60) } // set third parameter to (20*60), leave others at your choice
Marlin/src/probe.cpp
Add these 8 lines at line 601 (just below "if (TERN0(PROBE_TARE, tare())) return true;"):
#ifdef Z_PROBE_PAUSE_INTERVAL_MS
if (Z_PROBE_PAUSE_INTERVAL_MS > 0)
{
millis_t time = millis() + Z_PROBE_PAUSE_INTERVAL_MS;
while (millis() < time)
idle();
}
#endif // Z_PROBE_PAUSE_INTERVAL_MS
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Re: Precision Piezo Z-probe Now available. October 11, 2021 04:55PM |
Hello all. I'm getting desperate and don't know what to try anymore, and hopefully someone has ideas which could help.
Since I switched to a Hemera extruder, I had to trade off my Orion for a universal PCB (v2.85) with 4 andromedas.
I used the underbed brackets found on Thingiverse and referred to in the documentation, which I integrated in a corner bracket fitting my bed.
For the life of me I am unable to get it sensitive enough; I played with the VR1 and VR2 as much as possible, increased and decreased the tension using my bed knobs, tried analogue and digital mode, played with the dive speed from 300 to 10 000, nothing seems to work. It does register, but the force needed is so high that the extruder bracket flexes before it registers, and of course making the trigerring uneven and unreliable.
Here is my config:
M558 P8 C"!zprobe.in" H10 F10000 T6000 A2
G31 P{sensors.probes[0].value[0] +5} X0 Y0 Z-0.4
Images of the brackets attached (foil tape is to protect them from the heatbed)
Any help is appreciated!
Since I switched to a Hemera extruder, I had to trade off my Orion for a universal PCB (v2.85) with 4 andromedas.
I used the underbed brackets found on Thingiverse and referred to in the documentation, which I integrated in a corner bracket fitting my bed.
For the life of me I am unable to get it sensitive enough; I played with the VR1 and VR2 as much as possible, increased and decreased the tension using my bed knobs, tried analogue and digital mode, played with the dive speed from 300 to 10 000, nothing seems to work. It does register, but the force needed is so high that the extruder bracket flexes before it registers, and of course making the trigerring uneven and unreliable.
Here is my config:
M558 P8 C"!zprobe.in" H10 F10000 T6000 A2
G31 P{sensors.probes[0].value[0] +5} X0 Y0 Z-0.4
Images of the brackets attached (foil tape is to protect them from the heatbed)
Any help is appreciated!
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