Probe feedrate/deviation?



  • Two part post.

    1. the wiki says to set the feed rate (which I assume is probing speed) to 1000. Has this been tested to be the optimal speed or are we just saying hey this works. It seems pretty quick compared to the speeds that got me optimal results with other systems.

    2. what exactly is the deviation? My machine has metal corners and is pretty damn well built, my results are usually 0.044 deviation, usually consistently. I see other people posting 0.004 deviations. Does their machine print better? Are we all even after calibrating but their's just had fewer problems to calibrate out? Or does their lower result mean a better calibration? I'm currently using S9 calibration and it's working pretty well, I can print 300mm round at .2 but not at .1 should I be switching to like S4 calibration?



  • I only use S9 a couple of times to determine rod length, but you need to probe outside of the frame to get accurate results. I then use S6. Running an S-1 will show tell you the results from each probe point and you can determine if the bed is not level. A hard mounted bed can be shimmed or if you have an adjustable bed, you can manually level it.

    A lower deviation will produce a better first layer on a large print. Getting under .020 isn't impossible.


  • administrators

    A probing speed of 1000 has been found to work well. If you probe too slowly then the contact between the nozzle and the bed might not be detected, because the electronics and firmware look for a change in the reading from the strain gauge, not an absolute value. If you probe too fast then it will push deeper into the bed than necessary.

    If the deviation from auto calibration is high, use the spirit level supplied to see whether there is any tilt as the effector moves in the XY plane.



  • Isn't there a list of S numbers somewhere? I can't find it. I don't use the rod length because I've measure mine more accurately than I expect the firmware could, I use 8 primarily to control any tilt on my bed. Should I try S4 or S5? Which does what again?



  • • 4-factor: Similar to traditional manual delta calibration, but much faster. Adjusts the endstop switch position corrections (M666 XYZ parameters) and the delta radius (M665 R parameter).
    • 6-factor: as 4-factor but also adjusts the X and Y tower position corrections.
    • 7-factor: as 6-factor but also adjusts the diagonal rod length (M665 L parameter).
    • 8-factor: as 6-factor but also adjusts the X and Y tilt angles (M666 A and B parameters).
    • 9-factor: as 8-factor but also adjusts the diagonal rod length (M665 L parameter).





  • @clearlynotstefan:

    Two part post.

    1. the wiki says to set the feed rate (which I assume is probing speed) to 1000. Has this been tested to be the optimal speed or are we just saying hey this works. It seems pretty quick compared to the speeds that got me optimal results with other systems.

    2. what exactly is the deviation? My machine has metal corners and is pretty damn well built, my results are usually 0.044 deviation, usually consistently. I see other people posting 0.004 deviations. Does their machine print better? Are we all even after calibrating but their's just had fewer problems to calibrate out? Or does their lower result mean a better calibration? I'm currently using S9 calibration and it's working pretty well, I can print 300mm round at .2 but not at .1 should I be switching to like S4 calibration?

    If it could help, I'm using S8, but change the probe speed down to 100 and sensitivity of the smart effector down to 20. With speed to 1000 and sensitivity to 50 I've encountered few issues to get a consistent Z0 after each calibration, even after using G30 S-1 to tune my G31 in config.g.

    Currently my deviation is between 0.012 and 0.017.


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