Z Issues

Any Idea why my smartrap stops levelling the bed at about 10mm off the glass bed? The hotend doesn't touch the glass but it still stops. This is the output from pronterface. It might help

Connecting...
start
Printer is now online.
echoowerUp
External Reset
Brown out Reset
Marlin1.0.0
echo: Last Updated: Dec 13 2014 22:01:00 | Author: (smartfriendz, smartrap1.06)
Compiled: Dec 13 2014
echo: Free Memory: 3538 PlannerBufferBytes: 1232
echo:Hardcoded Default Settings Loaded
echoteps per unit:
echo: M92 X80.00 Y80.00 Z400.00 E153.00
echo:Maximum feedrates (mm/s):
echo: M203 X500.00 Y500.00 Z4.00 E25.00
echo:Maximum Acceleration (mm/s2):
echo: M201 X9000 Y9000 Z100 E10000
echo:Acceleration: S=acceleration, T=retract acceleration
echo: M204 S3000.00 T3000.00
echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s), Z=maximum Z jerk (mm/s), E=maximum E jerk (mm/s)
echo: M205 S0.00 T0.00 B20000 X15.00 Z0.40 E5.00
echo:Home offset (mm):
echo: M206 X0.00 Y0.00 Z0.00
echoID settings:
echo: M301 P17.77 I0.88 D89.69
echoD init fail
echo:endstops hit: X:0.12
echo:endstops hit: X:0.11
echo:endstops hit: X:0.10
Loaded C:\Users\England Family\Downloads\jhead_fanj.gcode, 53983 lines
4824.16470692 mm of filament used in this print
The print goes:
- from 62.33 mm to 117.67 mm in X and is 55.34 mm wide
- from 57.34 mm to 122.66 mm in Y and is 65.31 mm deep
- from 0.00 mm to 26.15 mm in Z and is 26.15 mm high
Estimated duration: 1:18:34
Print started at: 22:38:03
Bed x: 30.00 y: 160.00 z: -16.00
Bed x: 30.00 y: 20.00 z: -16.00
Bed x: 160.00 y: 20.00 z: -16.00
Disconnected.


Thanks

Quote
jbutj
Any Idea why my smartrap stops levelling the bed at about 10mm off the glass bed? The hotend doesn't touch the glass but it still stops. This is the output from pronterface. It might help

Connecting...
start
Printer is now online.
echoowerUp
External Reset
Brown out Reset
Marlin1.0.0
echo: Last Updated: Dec 13 2014 22:01:00 | Author: (smartfriendz, smartrap1.06)
Compiled: Dec 13 2014
echo: Free Memory: 3538 PlannerBufferBytes: 1232
echo:Hardcoded Default Settings Loaded
echoteps per unit:
echo: M92 X80.00 Y80.00 Z400.00 E153.00
echo:Maximum feedrates (mm/s):
echo: M203 X500.00 Y500.00 Z4.00 E25.00
echo:Maximum Acceleration (mm/s2):
echo: M201 X9000 Y9000 Z100 E10000
echo:Acceleration: S=acceleration, T=retract acceleration
echo: M204 S3000.00 T3000.00
echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s), Z=maximum Z jerk (mm/s), E=maximum E jerk (mm/s)
echo: M205 S0.00 T0.00 B20000 X15.00 Z0.40 E5.00
echo:Home offset (mm):
echo: M206 X0.00 Y0.00 Z0.00
echoID settings:
echo: M301 P17.77 I0.88 D89.69
echoD init fail
echo:endstops hit: X:0.12
echo:endstops hit: X:0.11
echo:endstops hit: X:0.10
Loaded C:\Users\England Family\Downloads\jhead_fanj.gcode, 53983 lines
4824.16470692 mm of filament used in this print
The print goes:
- from 62.33 mm to 117.67 mm in X and is 55.34 mm wide
- from 57.34 mm to 122.66 mm in Y and is 65.31 mm deep
- from 0.00 mm to 26.15 mm in Z and is 26.15 mm high
Estimated duration: 1:18:34
Print started at: 22:38:03
Bed x: 30.00 y: 160.00 z: -16.00
Bed x: 30.00 y: 20.00 z: -16.00
Bed x: 160.00 y: 20.00 z: -16.00
Disconnected.


Thanks

Have you set a Z offset in your firmware?

---

[regpye.com.au]
"Experience is the mother of all knowledge." --Leonardo da Vinci

No I havent, how do I do that?

GCode M555 Z. Just M555 will show existing one.

Thanks for the reply. Once I've done the command what do I do next?

When your Z endstop switch/probe/whatever triggers, your hotend's tip is (hopefully) at some distance from the bed.
By adjusting the Z offset (with M555 when using smartrap's Marlin version, or M851 if using the official Marlin release), you 're actually telling Marlin how much away your hotend tip is from the bed.
So by setting the Z offset as, say -0.55, you 're saying that after the homing process, the bed is 0.55 mm *down* from where it stopped (that's why you use a negative number when setting the offset: to indicate "down").

After you tweak the Z offset and set the correct value, don't forget to send a M500 too to store this value in the EEPROM


Hope this helps,
Yiannis.

Thank you Mandrav, it is clear expnanation.

But your problem could be that is you do only a G29 , the Z is only going down for 15mm max ( it's a software security). That's why we usually make a home Z before.

To try, you need to be around 10 mm above the bed.

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the Smartrap project

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[github.com]
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Quote
smartfriendz
Thank you Mandrav, it is clear expnanation.

But your problem could be that is you do only a G29 , the Z is only going down for 15mm max ( it's a software security). That's why we usually make a home Z before.

To try, you need to be around 10 mm above the bed.

Ooh, I didn't know about the 15mm max, that explains a lot. In the past, I've had to manually lower the Z to touch (or near) the bed, then G29. That worked just fine, but it's very good to know WHY it was happening.

Cheers Serge.

Thanks everyone, im still learning at this so what do i need to type to set the correct Z offset

m555, followed by a number? and followed by m500?

Thanks

M555 Z-0.45
M500

(use your own number in place of "-0.45", of course)

Thanks, so how do i work out the number? Trail and error?

Hi, ive done that and now it kinda works. But ive noticed that when you press the z 10 button on pronterface the z axis doesnt move that much (compared to my other printers) any reason why this might be happening How many jumpers to you use under the z stepper drive? Ive got 3

zbutj: I'm a newbie too, but this is how I do it -

Home Z, to get it to the bed.

Then G29 to autolevel.

When it rests, use manual control to move Z up a bit. Do this until you can slip a thin (2D printing type) piece of paper under it. Lower Z until the paper has a bit of contact between hotend and bed, but paper can still move around.

Note what the Z says - it might be something like "1.23"

Enter M code, using that number - eg: M555 Z-1.23

Enter M500 to write to the board.

Thanks for all the help guys, this is what i got

SENDING:G29
Bed x: 30.00 y: 160.00 z: -4.55
Bed x: 30.00 y: 20.00 z: 1.45
Bed x: 160.00 y: 20.00 z: -0.69
echo:endstops hit: Z:-0.69

Is the -0.69 bit that part you mean when i look for

"Note what the Z says - it might be something like "1.23""

Thanks