consistent layer shift in both x/y using clear-path servos ?

nhof

Could be an issue with the probing / compensation rather than the motor drive at this point.

Maybe try disabling the auto level and try leveling the bed with a shim or a indicator to see if you can narrow the problem down.

The reason I mention this is because I have had problems in the past with my BL Touch probes creating inconsistent height maps where it looked like one side of the bed was way higher than the other, while my dial indicator indicated that everything was actually flat.

ThatBigPrint

@nhof i have moved away from grid and gone to 5 point bed level now works fine think it was the probe picking up the edge of the printbite ?

dc42

@thatbigprint said in consistent layer shift in both x/y using clear-path servos ?:

@nhof i have moved away from grid and gone to 5 point bed level now works fine think it was the probe picking up the edge of the printbite ?

Try a smaller mesh then?

ThatBigPrint

@dc42 tried a smaller constrained mesh but no luck its ok for now using 5 point level as the plate is flat tooling plate just how its mounted will not allow for adjustment prints are coming out perfectly flat now

just need to work on quality now

ThatBigPrint

Right guys i have revisited the printer so things i have done so far

added io expansion board in a sinking 5v style control for step direction and enable

tried adjusting the m569 values

but i get the same issue the centre of the bed is closer to the nozzle than the perimeter i have mechanically levelled bed as best as i can the z motor has now got significant gear reduction now dimensionally the printer movers are accurate as individual entities but both mesh levelling and bed levelling are not doing as intended.... the motor is moving as though its attempting to level but it feels a bit rough in its movements as in it jerks not smooth

not sure what to try next i have had better success with t values all set to 4 but this adds ringing.... i have used recommended settings suggested by mr DC42

"The setup time is 25ns not 25us, so instead of 1:1:25:1 I suggest 1:1:0.5:0 in the M569 T parameter. My suggestion to use 0.5us setup time is to allow for possible skew in the opto isolators."

but i get constant skipped layers in x and y immediately as in shell is printed and fill is not within the boundary

dc42

@thatbigprint said in consistent layer shift in both x/y using clear-path servos ?:

"The setup time is 25ns not 25us, so instead of 1:1:25:1 I suggest 1:1:0.5:0 in the M569 T parameter. My suggestion to use 0.5us setup time is to allow for possible skew in the opto isolators."
but i get constant skipped layers in x and y immediately as in shell is printed and fill is not within the boundary

If 1:1:25:0 works but 1:1:0.5:0 doesn't work, try something like 1:1:1:0 or 1:1:2:0.

nhof

@thatbigprint Can you also shoot a picture of your mechanical setup including how your probe is physically mounted to the machine?

I had major problems with the probe creating 'tilted' height maps on a large printer and it turned out the X axis was twisting slightly across the stroke which caused the probe reading to vary significantly (0.5mm+) from side to side.

ThatBigPrint

Thanks both of you i have got it to perform better now setting t values to

T1.25:1.25:1.25:1.25 what is the end value for the one that is zero in aforementioned example ?

If 1:1:25:0 works but 1:1:0.5:0 doesn't work, try something like 1:1:1:0 or 1:1:2:0.

i thought it was set up time or stop delay ?

ThatBigPrint

@nhof how do i upload pictures ?

dc42

The last one is direction hold time after the step pulse leading edge.

ThatBigPrint

@dc42 said in consistent layer shift in both x/y using clear-path servos ?:

The last one is direction hold time after the step pulse leading edge.

would this being set to zero previously cause the issues i was having ?

dc42

@thatbigprint said in consistent layer shift in both x/y using clear-path servos ?:

@dc42 said in consistent layer shift in both x/y using clear-path servos ?:

The last one is direction hold time after the step pulse leading edge.

would this being set to zero previously cause the issues i was having ?

It could do, depending on the requirements of your driver.