Use for Mechanical Bed Leveling



  • I am looking to use the Duet WIFI to power my 3D printer design. The idea is to have a three lead screw system where the lead screws can operate individually to level the bed instead of having a manual process. I am wondering if this is something the Duet could handle?


  • administrators



  • Yeah exactly like that, no idea how I missed that I thought I searched through everything. Thanks for pointing it out to me very helpful!


  • administrators

    @badrobit:

    Yeah exactly like that, no idea how I missed that I thought I searched through everything. Thanks for pointing it out to me very helpful!

    I only added that page a few hours ago, that would be why you didn't find it!



  • WOW, you are DA MAN! was that a 1 day turn around on dual z homing. pretty amazing support if you ask me! I am not sure if you saw my question in the original thread somewhere but i was curious of your thought of dual z motors in serial vs a single z motor. If i understand the PIER here, amps are shared so 2 motors at 1/2 power or 1 motor at full right? that being the case, any upside to 2 motors in this config? I could see moving 2nd z motor to another port to get more power but i am trying to keep a port free for an "eventual" dual print head upgrade and honestly not sure i need more power for Z. If push comes to shove, i suppose i could get an expansion board but for now, the ee in me is wondering why 2 motors in series is a good thing? I have seen the behavior mentioned before where dual motors tend to tilt the bed especially at power up. If i understood you correctly, single z motor would resolve all that. I know you can beak it down in a way i will understand cause the math isn't getting it done LOL

    On a side note, i did try to implement z homing via bl touch over the weekend. It was a total disaster (my bad of course ) On the up side, when i reverted to original config mesh bed leveling appears to be working much better now. 1st layer is spot on almost every time or at most a 1/4 turn to 1 bed screw and i am dialed in. suspect dual z issue is culprit but working around it successfully now 🙂


  • administrators

    If you connect two stepper motors in parallel as RAMPS does, each one gets half of the current. So you need to set the current to double in order to get the usual torque - but that may well be more than the driver can supply without overheating.

    If you connect them in series instead as the Duet does for the Z motor connectors, both get the full current. But you need double the voltage available to achieve that current. Typical stepper motors used in 3D printers are rated at between 1.5A and 2A, and at low speeds drop about 3V. So even with 2 in series, the voltage drop at low speeds is only about 6V, and a 12V supply is plenty to drive them.


 

Looks like your connection to Duet3D was lost, please wait while we try to reconnect.