Is BL Touch the best option?



  • @Hornetrider said in Is BL Touch the best option?:

    Precision Piezo works very good

    Do they relay on the nozzle touching the heatbed? Is there a problem if the nozzle has filament oozing from it?


  • Moderator

    @zapta said in Is BL Touch the best option?:

    @Hornetrider said in Is BL Touch the best option?:

    Precision Piezo works very good

    Do they relay on the nozzle touching the heatbed? Is there a problem if the nozzle has filament oozing from it?

    Yes and yes.



  • Well, if filament is oozing from the nozzle, it ain't a big deal.
    I have set the hotend temp to 210 Deg C. With this setup it does not really matter.

    If you run a bed compensation (measurement) it is recommendable to have the filament retracted as far a possible form the hotend. I do this only for the measurement that I run once in a while...I have no need to run it on every print.



  • As part of my slicer config\running print setup, I mimic the Prusa MK2\Mk3 machines and perform a nine point bed levelling routine, when everything is heated to running temperature.

    This ensures that I have an accurate levelling measurement for any particular print.



  • @Hornetrider said in Is BL Touch the best option?:

    Well, if filament is oozing from the nozzle, it ain't a big deal.

    What about the travel distance from detection to stop? That is, is there sufficient distance to stop before the head get damaged?

    (trying to understand, not to criticize).



  • I have a Ender 3 with a Duet 2 Maestro fitted and a genuine BL touch, it consistently works every time with no problems, I haven't used any other type of sensor so can't compare but I just wouldn't swap it.


  • Moderator

    @zapta the piezoelectric is very sensitive and triggers at the slightest tap. The trigger height is consequently slightly negative (-0.1mm) or so. Similar to the smart effector.



  • @Phaedrux, my concern is that once the bed touches the nozzle and it get detected, the heavy bed will continue to move a small distance before stopping, as with inertia, and will apply force to the head. With IR, BLTouch, Switches and inductive, the detection is done before the bed reaches the nozzle.

    Is it an issue?



  • No, it's not an issue IF you are set up properly. On the other hand, in my setup I could not get consistent triggering over the entire bed. As a result, some areas would trigger perfectly and other spots would have stuff deflecting everywhere as the nozzle met the bed and carried on.
    In some areas that was a minor issue where it just reflected in reduced accuracy and there were other areas where things would drive into each other more than a few mm's 😞



  • my exp:

    • original bltouch (2 and 3) - repeatable, reliable, dependable,easy to setup. the only problem I have is offset and inability to reach whole bed
    • clone bltouch (one that looks like original), not repeatable (huge error), died after less than a month (tried 2)
    • clone bltouch (black), repeatable (not as original but acceptable, way better than cap/ind probes), running for 6m without problem
    • precisepiezo hotend original (v1, not new fancy pcb), superb, best ever, can't be mounted everywhere (I use: thing:2658639)
    • preciosepiezo hotend made by me -> 100% same as original v1
    • precisionpiezo hotend clones (tried few) pot very low quality, had to replace 6 of them, rest like original
    • precisionpiezo for bed original v1 - shit 😞 don't work for me
    • precisionpiezo for bed clones - shit 😞 dont work for me
    • precisionpiezo for bed original v2 (andromeda) - in process of testing on ender 5, so far I love it but too soon to say

    its only my experience on some ~10 printers



  • To aid the setting up of the Precision Piezo(s), I replaced the single turn potentiometer, with a multi turn type.

    This gives far greater control of sweet-spot settings, and ensure I get consistent repeatable reading across a 300x300 mm bed.


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