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Thread: Mpcnc

  1. #11
    Engineer Roberts_Clif's Avatar
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    As far as I can tell in Cura when you hover the cursor above the print speed 40% with my settings is 4.5mm^3 Per Second and 76% is 8.5mm^3 Per Second.

    With a .4mm nozzle at a layer height of .28mm. It further States that the Print will complete at # of hours and it does.


    Print Speed.jpg
    Last edited by Roberts_Clif; 05-13-2019 at 04:54 PM.

  2. #12
    Super Moderator curious aardvark's Avatar
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    lol right.
    I'm used to print speeds being in mm/s - which I can visualise.
    cubic mm per second on the other hand - just isn't something that's easy to understand.

    Interesting that it says an ultimaker can just about do 150mm/s. My ?200 delta can do that without any problems :-)

  3. #13
    Engineer Roberts_Clif's Avatar
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    It is sometimes confusing.
    You can see it the previously posted Photo I am printing in the Yellow.
    It clearly shows that printing over 8.0mm^3 Per second could cause filament slippage.
    With my Settings that Max speed percentage is 71 being 8.0mm^3 Per second, an 72 being 8.1mm^3 Per second.
    I have successfully printed many models at over 100% " (11.2mm^3 Per second) " using PLA though have yet to venture this on ABS.

    I prefer to stay closer the upper limits I determined make the best Models. 8.0 - 9.6mm^3 Per second.

  4. #14
    Super Moderator curious aardvark's Avatar
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    you should be able to change the units to mm/s - I'd be interested to know what your actual print speed (not volume) actually is :-)

  5. #15
    Engineer Roberts_Clif's Avatar
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    I have never calculated it only took the numbers from Cura do you have a formula

    Found this V=pi*radius^2*print speed = mm3/s.

  6. #16
    Super Moderator curious aardvark's Avatar
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    don't need a formula - cura will have an option to show either speed or volume. just switch to speed. see what it is and switch back :-)

  7. #17
    Engineer Roberts_Clif's Avatar
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    Assembled the Middle Assembly today still need the conduit to assembly the remaining frame Assemblies.

    Middle Assembly.jpg

  8. #18
    Super Moderator curious aardvark's Avatar
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    neat :-)
    Took a while to work out what goes where lol

  9. #19
    Engineer Roberts_Clif's Avatar
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    Found a problem with the MPCNC Design.

    Bearing 1.jpg



    You can see in the middle assembly, that the 5/16 bolt head and the Bearing are touching, This will have to have thinner Bolt Head.
    Will be Grinding about 1/2 the thickness of the bolt head away to allow the bearing to freely spin...


    Bearing 2.jpg

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