Differential IR height sensor, Attemptin' Clone....ain't sure of success...now stage 10

Mark, forgot to say thanks for the heads-up, easy to overlook code stuff for us code-challenged.......Yeah I see, anyways, think I see......my X axis is fine........the Y is offset by 25mm, (my mount) due to the physical mounting of the mini IR. That will have 'auto level' recording measurements about an +inch in the Y from its actual location, nine different places........

 

I can't seem to figure out the Z offset settings.. I have everything connected and working in the right directions. I can send a G28 X0 Y0 Z0 and then a G29, the printer goes about it's business with the probing, When I tr to actually print something, it prints in mid air looks to be approx the z offset too high...

 

Did you use a negative number?

 

yep..

under firmware Z can be negative is checked,
In the Eeprom settings : z homing offset -1.7
here's the latest
->N14 G28 X0 Y0 Z0*109 [364.206]
<-ok [368.698]
->N15 M114*19 [368.700]
<-X:0.00 Y:0.00 Z:-3.44 E:49.42 Count X: 0.00 Y:0.00 Z:-3.44 [368.713]
<-ok [368.713]
->N16 M105*16 [368.714]
<-ok T:207.3 /207.0 B:76.1 /75.0 T0:207.3 /207.0 @:62 B@:0 [368.723]
->N17 G29*36 [368.728]
<-Bed x: 15.00 y: 20.00 z: -3.11 [377.063]
<-Bed x: 82.00 y: 20.00 z: -1.81 [380.118]
<-Bed x: 149.00 y: 20.00 z: -0.82 [383.222]
<-Bed x: 150.00 y: 85.00 z: -0.65 [386.479]
<-Bed x: 83.00 y: 85.00 z: -1.72 [389.998]
<-Bed x: 16.00 y: 85.00 z: -3.02 [393.561]
<-Bed x: 15.00 y: 150.00 z: -3.01 [396.850]
<-Bed x: 82.00 y: 150.00 z: -1.75 [399.902]
<-Bed x: 149.00 y: 150.00 z: -0.76 [403.007]
<-Eqn coefficients: a: 0.02 b: 0.00 d: -3.32 [403.019]
<-planeNormal x: -0.02 y: -0.00 z: 1.00 [403.019]
<-ok [403.023]
<-echo:endstops hit: Z:-0.76 [403.023]

 

Does the Mini's Led flash twice when you power-up, you may have to shut-off the AC power via the switch & pull the USB, wait 5 seconds...then just plug-in the USB...no need to turn rear power switch on....wait for board to blink twice.
What's your results?

That will tell us the mini has power & mini's firmware has detected the ramps low value resistor, placed the mini into Digital Mode.

 

Did you put it the z offset in the firmware and the slicer? Only should be in one of course. Odd that you are up too high by the z height value.

 

I think that's my issue. it's in both.
I just set it to zero in the firmware, and to -0.7 in the slicer. trying again.

 

Good Call Danz

 

yes, it's getting power, and blinking, the auto level routine is working, Just printing too high...

 

Good, Did Danz comment help?

 

Does it seem to be only a mm or 2 too high?

My Z offset required -1.75 to print 1st layer solid.........

 

Hi Puff, could you also post a picture of the backside of this prototype? just curious

 

Hi Puff, If you use marlin firmware you can also do the Z_MIN_PROBE_REPEATABILITY_TEST by sending M48. it will give you a mean and a standard deviation.
according to a post in the forum on 3dprintboard you can also set xy coordinates, number of samples and some other stuff.

you need to make sure this line is not commented out in configuration.h:

#define Z_MIN_PROBE_REPEATABILITY_TEST // If not commented out, Z-Probe Repeatability test will be included if Auto Bed Leveling is Enabled.

 

Where in the Firmware does one set the offset? I tried without any luck. I can set it in Mattercontrol successfully, getting very close to the perfect z height. I love the ease of setting it 0.01mm at a time.

also lifted one side of the bed about 1/2 inch and was still able to get a decent print.

 

This is the version working on both my printers.


The ones on the right are the fixed version.



Sent from my iPhone using Tapatalk

 

Thanks to Mark T, Mike K, Waldo for their input, ( Hey! Marlin needs to know you are not Z probin' at the nozzle )

I revised these statements as well:

// these are the offsets to the probe relative to the extruder tip (Hotend - Probe)
#define X_PROBE_OFFSET_FROM_EXTRUDER 0
#define Y_PROBE_OFFSET_FROM_EXTRUDER -25 //(revised from 0, my mini IR is mounted 25mm from nozzle)
#define Z_PROBE_OFFSET_FROM_EXTRUDER 0

also revised the instruction line,

#define Z_SAFE_HOMING // This feature is meant to avoid Z homing with probe outside the bed area.
// When defined, it will:
// - Allow Z homing only after X and Y homing AND stepper drivers still enabled
// - If stepper drivers timeout, it will need X and Y homing again before Z homing
// - Position the probe in a defined XY point before Z Homing when homing all axis (G28)
// - Block Z homing only when the probe is outside bed area. ( the probe is the mini IR )