Yes I noticed that the LCD displayed 3Drag rather than K8200 which is no biggy as they are effectively the same printer. but it probably means there were some config options missing or incorrect.
I have now calibrated the Z stop sensor and warming for the first print fingers crossed. BTW for anyone else out there. It was mentioned before by Barnabybear that when you home the Z with auto bed levelling. It moves to Z=0 and this does not include your Z - probe offset. So if your offset is say -0.9 it will home Z to 0.9 above your desired position. you can see this by giving an M114 and it will show the actual position including offsets. When it goes to print it will apply the offset.
Recently i have installed auto bed leveling on my Velleman K8200 (3drag). Everything was working fine, until I accidentaly broke my servo. After replacing the servo with new one (Tower pro 9g), servo moves only to one position, does not matter what angle i send with M280. It always goes to the same angle, despite the angle i set. What could be wrong here? I have checked my wiring, pins are OK.
I also installed the sensor for auto bed leveling.
Everything works except that every time i restart the repetier host it loses the clearance.
Every time i have to use the m851 z-… command.
Also the height changes from day to day.
i can use Z-0.3 one day and the other day i have to use Z-0.64, have any idea whats the problem with that?
Hello,
I am trying to get Auto bed levelling working also with Inductive sensor
I have installed the sensor and it is triggering fine on Aluminium sheet place on heated bed- tested with M119.
I have modified the firmware as per Thomas Sanladerer youtube.com/watch?t=217&v=EcGFLwj0pnA
I set the Z off set at -.57 as per Thomas’s method and this works fine for laying down first layer.
When I manually enter G28, G29 in to terminal all goes well and the routine appears to runs fine
However when I go to do an actual print I am getting big issue.
When I enter G28, G29 in to starting Gcode the ABL routine runs fine but when the print starts
it is off set so that it tries to print (my large calibration circle) too far to the right and too far back of the bed.
I have tried with Mattercontrol and Simplify3D and same issue
When I print with the same stl file and same firmware without the G28, G29 in to starting Gcode it prints fine (although not with the ABL in force)
This would suggest that my issues probably lie in the ABL settings in the firmware ?
[quote=“Barnabybear”]If you use a home command (G28) it will always stop when the sensor is triggered, but you should be able to manualy move to lower than the home postion.
Try homing then M114 (get current postion) should be somthing like x:0.00 y:0.00 Z:3.00 E0.00
If that works, try a direct move command:
G21
G90
G1 z2
That should:
Set dimentions to mm
Set absolute postioning
Move the nozzle to 2mm above the bed.
EDIT: after homing and the M114 Z should be equal to the distance between the bed and the nozzle. If not adjust the offset in the firmware. Then try the direct move.[/quote]
Hi
Can I see whereabouts in the UK you are? I’m in Cambridge and have tried to setup the ABL, using the servi and thingiverse setup. I think I had hair once. Have tried approx 500 times, measuring, testing, measuring, testing, checking… Aaaaaaaaaaargh
If you could provide any assistance or chat. I would for ever be in your debt…
Anybody got any advice - I have tried a load of different options but nothing having any positive impact
Including this reprap.org/wiki/Configuring_Marl … Dimensions but this just offset everything and it tries to home way off the bed.
A few new observations :
When I home using slicer jog controls the NOZZLE homes to front left corner (which has always been home)
When I use G28 typed into terminal the SENSOR (not nozzle) homes to the centre of the bed (which I guess is the home in configuration.h)
When G29 (ABL routing runs) it seems to be going to off set points versus what I have in my configuration.h and what it is reporting back in terminal
i.e.
G29
<-Bed x: 10.00 y: 5.00 z: 0.47 (but its actually going to more like 2, 60
<-Bed x: 150.00 y: 5.00 z: 0.42 ( but its actually going to 145, 60
<-Bed x: 150.00 y: 140.00 z: 0.36 (similar issues)
<-Bed x: 10.00 y: 140.00 z: 0.60 (similar issues)
<-Eqn coefficients: a: -0.00 b: 0.00 d: 0.53
<-planeNormal x: 0.00 y: -0.00 z: 1.00
It then tries to print starting at the dead centre of my bed which results in prints off the right and back of the bed
When I use G0 to go to the points specified in configuration.h they go to correct location
When I revert to previous (non ABL) firmware all works fine so I know I don’t have a mechanical problem
From Configuration.H
// set the rectangle in which to probe #define LEFT_PROBE_BED_POSITION 10 #define RIGHT_PROBE_BED_POSITION 150 #define BACK_PROBE_BED_POSITION 140 #define FRONT_PROBE_BED_POSITION 5
Tearing what hair I have left out on this (last hack to my K8200 !!!)
Only problem that i have is that when the printer is measuring the height on those 4 spots, with every print it changes.
First time can be 1.3 , 1.45, … etc and second print its 2.5 , 2.62 etc my offset isn’t correct anymore.
Has somebody any solution for this?
The maximum axis travel is limited to prevent the bed crashing into the printer frame.
The limit is also coded in the firmware. So you are able change it.
But, before you do that, physically test if the Bed can REALLY travel 50 mm more without crashing into the frame or other mechanivcal parts!
I don’t believe the k8200 mechanics allow 50mm additional travel on the x axis.