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  1. #1

    Exclamation Extruder Upgrade assemblies ??

    Has anyone here tried these extruder upgrade assemblies ?
    I think they will fit all printers with nema-17 stepper-motors in extruder.
    Found them on eBay.

    Thinking about trying a set on our CTC.
    Hoping they will be easier to clean and maintain ?

    Click picture for larger view:

    ExtruderUpgrade2.jpg

  2. #2
    Oh well, No one seems to know anything about these extruders, from the UK.

    So, I'll go ahead and order them to Test them out.

    You Knew I Would didn't You !

  3. #3
    Well, I got these extruders after almost 2 weeks
    and found problems with them.

    The stepper-motors just click and will not Turn!
    The motor shafts are about 1 centimeter Too Long,
    and there is No flat in shaft for the set-screw.

    Both motors received do the same thing, so it's not just a single defective motor.
    I do know that not all Nema-17 motors are made the same internally,
    and some require higher voltages and currents than others.
    So, I think the problem is that these motors do Not match the settings in printer's Firmware.
    The CTC motherboard does not have adjustment pots, like some older printers did.

    If changing Firmware is the only way to get these motors to operate,
    then they are Unusable in our printer !

    I would not mind modifying the motor-shafts, if I can get them to operate.

    I will install the extruders on some good motors though,
    and see how they operate, after I get this problem resolved with the Seller.
    Last edited by EagleSeven; 10-21-2015 at 12:32 PM.

  4. #4
    Senior Engineer
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    Check your start Gcode. You can change the current with G130.

    If you have a line like (for example) G130 X127 Y127 A127 B127 in your start.gcode then your current is maximum already. The value is a 7 bit number from 0 (no current) to 127 (max current)

  5. #5
    Quote Originally Posted by Mjolinor View Post
    Check your start Gcode. You can change the current with G130.

    If you have a line like (for example) G130 X127 Y127 A127 B127 in your start.gcode then your current is maximum already. The value is a 7 bit number from 0 (no current) to 127 (max current)
    Yes, but the problem is that we are using Makerware-2.4 Slicer software
    and do Not have access to G-code.
    I has it's own code format and it does not include anything about stepper-motor control,
    that I can find
    Firmware is not compatible with any other slicers I've tried, except for Rep-G.

    I tried to test motors using Replicator-G slicer, but had problem with Python-interpreter.
    Python must have got corrupted some how ??
    Maybe I can use it to test, but will need to reinstall Python, to get it working again.
    And I really don't want to do that, just to test these motors !
    Since motors are Not working with the set-up we Have and want to Keep that way.
    Last edited by EagleSeven; 10-21-2015 at 04:14 PM.

  6. #6
    I'll probably keep these steppers for a robotics project I've been planning,
    using an Arduino kit controller board.

    Just too much trouble to try to send them back for a refund !
    Since they are part of a kit and I want to keep the other parts in kit.

    But now I'm concerned about how I can determine which Nema-17 motors will work in this printer
    and which will Not, if I ever need to replace a failed motor ???

    They all Look similar but evidently have Big differences Inside !

  7. #7
    The seller thinks the motor Connectors are wired differently !

    I'm certainly not going to change wiring in our printer
    to try to match connector wiring in his motors !

    And I doubt they can be changed Inside the motors .

  8. #8
    Senior Engineer
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    You cannot change them inside, opening it buggers the motor up. The wiring is not likely to be different but is easy enough to check with a multimeter.

  9. #9
    Quote Originally Posted by Mjolinor View Post
    The wiring is not likely to be different but is easy enough to check with a multimeter.
    I'm thinking they may have reversed polarity of windings, inside the motor,
    not changed which pins go to windings.
    So, if that's true then the pins would look the same to an ohm-meter ??
    Last edited by EagleSeven; 10-22-2015 at 11:23 AM.

  10. #10
    Senior Engineer
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    Yup, but it would rotate a different way and only if one were changed and one wasn't if both are changed then it will behave the same.

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