Answered *READ ME* My ROBO doesn't auto level correctly!? FAQ

M565 should be negative. As it indicates the nozzle position when the probe senses the bed.

The logic here is this:

A typical autolevel system works with a retractable probe. The probe extends past the nozzle to sense the bed position. When the probe touches the bed the nozzle is in the air, say 1mm.

In this situation M565 would have a value of Z1.0

With the RoBo3D printer, and other printers that uses the nozzle as the probe point, the nozzle touches the bed and the switches activate after this. When the "probe" is activated the nozzle is "in" the bed, thus it's a negative 1mm "into" the bed.

In this situation the M565 would have a value of Z-1.0


Any other other option (Slicer, G1, etc) would use a Positive value, as it is raising the nozzle up in the air (out of the bed) to be offset correctly.

 

My question is tho mike is in matter control under printer;general;z-offset do I simply type 1.1 and does mattercontrol convert it negative when writing the gcode? or do I need to be typing -1.1

 

mine says 1.18

 

The only time to use a negative value is if you are using the M565 gcode command. This is essentially the same as a firmware value.

The slicer will just increase the first layer height to whatever your offset is. Ie if you set it to 1.5 with a .1mm layer height, it would start on Z height 1.5 instead of 0. Then the next layer would be 1.6, 1.7, etc

 

Ok I'm sorry. I misunderstood when you said no I thought you were saying no to what defender said. on the same page now

 

please forgive my daftness, how ever followed this guide, and i have found out that my z offset should be .8mm according to the paper test. now my question is what do i do with it once i know it? i have put .8 into the g code script but all it does is press the nozzle against the bed, and doesn't extrude any pla so i have been playing with the z offset and have just determined that 1.25 seems to be working the best so far, but i feel like i am still having inconsistent first levels.

 

Well... leveling the nozzle with calipers (as I think you said you did in the other thread may be your problem still.
The most important thing to be level with on the Z axis is being level with the switches. If they don't open at just about the same time, you can get wonky prints. As the head moves from one side to the other, one switch might not click at all as that side is not being supported by the nozzle. Though that might be a bit of a stretch to make up for half mm.

 

@defendermd okay i just adjusted the z azis so that i can hear the switches close at the same time

 

baited breath...

 

well so far that has made it worse, now even though i was able to get solid lines off the printer last night and before i set it the switches manually i was able to get pla on the bed, now its trying to print almost 2mm above the bed, just for comparason i ran the same file into matter control, and it printed perfect..... not a problem at all....

 

did you run a m119 against the switches?
are they all working?

Are your magnets seated?

 

well just for comparason, same file, same off set.

these are from simplify 3d







and these are from matter control

 

yea, i get it. something isn't set up right.

 

well, i tried to upload my settings, but new forum disallows it
I can mail them to you

 

printed this for the kid overnight with S3D doing the lifting. its 2 pieces and a bit of scarring from the support.

 

its decent. i'm happy with it. some crazy ringing, but its not "deep"

 

@mark tomlinson i have been manually leveling thats what i dont understand. like my z limit switches are literally hitting the stops at the exact same time, i dont know how much more level i can get. the y axis cant be adjusted, but my level tells me that the entire machine is perfectly level. what else can i manually level?