Solved pretty sure my mesh isnt working... or isnt working well.
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@joehsmash What you can check also, is whether the nozzle and bed heating conditions while measuring are the same as when you print, because bed heatup could warp the bed. The bed could warp downside also, lowering adhesion.
A magnetic bed could have a negative influence on the BLTouch also. (e.g. https://forum.duet3d.com/topic/10366/another-bed-leveling-weirdness )
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@JoergS5 i did notice that i some times get anomalies just like that, but what i have found atleast on my machine is that it was something mechanical or something weird. but ive always sorted it out.
here is the new mesh level, im going to take out the shims in the front portion to lower it, now that its a little more accurate.also it made no difference in the first layer print. more towards the front of the bed, it doesn't adhere.
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@joehsmash it's interesting that you have a separation horizontal line in the middle of the bed. This line is visible in the first image also. Maybe this is due to a mechanical reason?
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nah, i manually added metal shims under the flexible metal plate. it looks worse than it is, but i have already adjusted the shims and that hump is now gone.
i have lowered the layer height so that its actually too low and its adhering but its clearly not right yet.
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@joehsmash I would remove the XYZ values in M558.
M558 P9 C"zprobe.in" X0 Y0 Z1 H5 F120 T3000
=>
M558 P9 C"zprobe.in" H5 F120 T3000
They are parameters of an old firmware version (< 2). -
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@joehsmash sorry, I've overlooked it.
The idea I had was that maybe your BLTouch offset is still wrong somehow, so the mesh compensation is at the wrong place.
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I suspect that part of the problem may be a mismatch between the heightmap and the actual nozzle position. The heightmap is only accurate for the nozzle if the offsets are correct. So please double check your nozzle/probe x y offsets. If there is a mismatch it could be lifting when it should be dropping, etc.
https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Measuring_Probe_X_Y_Offset
The other factors for good first layer adhesion is a very clean be, appropriate temps for bed and nozzle, and accurate flow rate. The first layer height could be perfect, but if those other things aren't right it won't stick either.
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@Phaedrux i just re did my spacing for my probe, and you were correct, it was out.
new measurements were x0 y-26
reprobing the bed now and am going to try a test print
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Your trigger height still shows as 5mm. Have you done the calibration for that too?
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@Phaedrux it does, because as stated previously i would have to redesign the BL touch mount which i will once i can actually print things,
i didnt take into account the pin dropping so unretracted its actually around 2 mm off the bed, which is why when you look at the homeall.g i you can see why i raise the z to 10, before i probe.
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@Phaedrux also, am printing a bed level test now and its absolute rubbish. worse than before lol...
the front side now isnt printing at all haha
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calibrating the trigger height won't require you to redesign the mount. It's a procedure to give you an accurate measurement of what your nozzle to bed distance is after probing.
Have you used G30 S-1 to measure it yet?
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@Phaedrux yes a G30 S-1 give me the values of 5.30 consistantly
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@Phaedrux how ever isnt the probe tip supposed to be at the same level as the nozzle?
all though the BL touch probes at 5.30mm when i actually touch the nozzle to the bed or atleast touch it to a 0.13mm feeler gauge the z height is set at 0.69mm when it should be 0.13ish
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so right now, ive used a 0.05 feeler gauge to where it JUST touches the nozzle using 0.01 movements, than i removed the feeler gauge and dropped the nozzle down another 0.05 which should be touching the bed. only it doesnt actually move the nozzle.
its curious. i tried to send an M92 Z0 how it said that the command is sent how ever my z is still reporting to be a 0.44. when i send an M999 it resets like it should but it wont let me actually zero it.
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Did you use M561 to cancel any active bed compensation?
https://duet3d.dozuki.com/Wiki/Gcode#Section_M561_Set_Identity_Transform
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@joehsmash I looked at your print tests and into the config again, the M208 limits are bigger area than the M557 region, so mayby the mesh points don't cover the lines left down side and there is no compensation. I am not sure about it, but maybe you want to test this idea.
