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Awesome remote direct drive extruder

Samuel PinchesSamuel Pinches Posts: 2,060Administrator
edited April 6 in General Discussion
If you haven’t seen this, you gotta watch this!

https://youtu.be/FrLicMf4B9k

https://www.youtube.com/watch?v=FrLicMf4B9k

Post edited by Samuel Pinches on

Comments

  • GandyGandy Posts: 53🌟 Super Member 🌟
    Ever since I watched this, I'm thinking about modifying my A5 - has anyone tried this, yet?
  • GandyGandy Posts: 53🌟 Super Member 🌟
    For anyone interested, I started to design an adapter for the zesty nimble to the A5. It is in a very early stage and far from usable, but I'd be happy to get some feedback on this.

    Thanked by 1Samuel Pinches
  • Samuel PinchesSamuel Pinches Posts: 2,060Administrator
    Man, I wish JGAurora did something like this. Nice job. I really dislike bowdens...
  • GandyGandy Posts: 53🌟 Super Member 🌟
    Oh, I'm just learning to dislike them, but then I can be a quite fast learner at times  :D
    I could probably warm to the idea of keeping the tube for a reverse bowden, however.
  • itisnot_meitisnot_me Posts: 100🌟 Super Member 🌟
    they have an old one on thingi https://www.thingiverse.com/thing:1843195
  • GandyGandy Posts: 53🌟 Super Member 🌟
    I'm using that mockup for my adapter plate design, this thingy is linked on the adapter plate design resources page for the current v1.2
    I will ask zesty tech to check my design before I order one, though.
  • itisnot_meitisnot_me Posts: 100🌟 Super Member 🌟
    They said on the video they will make you one but it's always good to start the process.

    I would love to get one but 100 is out of the question since I would need to get a new motor also. Would even know what length of wire to get either
  • GandyGandy Posts: 53🌟 Super Member 🌟
    Just uploaded a new version which uses the existing bowden coupler to fasten the mounting plate to the print head.
    Also contacted the guys from Zesty Technology to clarify a few questions I had.
    Thanked by 1Samuel Pinches
  • GandyGandy Posts: 53🌟 Super Member 🌟
    The game is on, I've just ordered my Nimble. I've come to an adapter design that seems to fit nicely with the A5 frame, doesn't shave off too much of the printable height and even allows to keep the frontplate (just in case that adds to the rigidity of the frame):



    @Samuel Pinches my video taking skills are non-existent so there won't be a youtube video on this. But I will try to make a few stills of the conversion in case this makes an interesting addition to the wiki. The existing pages on modifications for the A5 are a great resource (as is the whole JGA wiki) and I'd be happy to contribute.
    Thanked by 1Samuel Pinches
  • Samuel PinchesSamuel Pinches Posts: 2,060Administrator
    Sounds awesome! Really looking forward to seeing your results. Photos of the setup would be great - and perhaps some before/after print tests?
  • GandyGandy Posts: 53🌟 Super Member 🌟
    Will do. I'm hoping to resolve the extrusion problems I reported in the other thread, or at least improve things visibly. At least this setup should allow me to print flexible material.
  • GandyGandy Posts: 53🌟 Super Member 🌟
    edited August 9
    Here it is, with the cover plate removed for full disclosure:





    Parts used:
    Required firmware configuration:
    • On a 8-bit board, E0 microstepping needs to be reduced from 1/16 to 1/4. Either set the appriopriate jumpers beneath the driver (remove the 2 outmost, leave the on in the middle) or by configuring the TMC2208, accordingly.
    • Extruder steps/mm is now 650 rather than 100 as a starting value for calibration.
    • E0 motor current needs to be adjusted; I fine-tuned that during a print for most silent operation. With a TMC2208, 350mA RMS seems to work; that would be Imax=494mA, or Vref=395mV on the A4988.
    • Depending on how the motor cabling winds up, the E0 direction may have to be inverted.
    • Retraction length can be dialed back to 1-1.5 mm (with FWRETRACT enabled, this can be adjusted on-the-fly, e.g. while printing a retract calibrating model; will only work with ABL, not UBL).
    Drawbacks/open issues:
    • At least with the TMC2208 driver and the MKS GEN_L V1.0 board, linear advance appears not to work properly
    • This will put you back ~100 EUR (plus VAT)
    • The extruder motor moves real fast. I'll need to find a way to reduce vibrations coupled to the frame. If everything else fails, I can detach the motor from the frame completely.
    I took pictures of every step during the build that is not already covered in the excellent documentation on the Nimble. If anyone is interested, I will post them here.
    Thanked by 1Samuel Pinches
    Post edited by Gandy on
  • chainbreaker2012chainbreaker2012 Posts: 30Member
    This looks fantastic, hope one day I can do a direct drive on the a5s.
  • GandyGandy Posts: 53🌟 Super Member 🌟
    edited August 13
    Finally I also managed to replace the original 8-Bit MKS GEN_L V1.0 board with the 32-Bit BigTreeTech SKR V1.3 - what a difference! Just mentioning this here to provide working settings for the Nimble on the 32-Bit board running the latest Marlin bugfix-2.0.x:
    • SCURVE_ACCELERATION and JUNCTION_DEVIATION disabled
    • TMC2208 RMS current for E0: 350 mA
    • E0 Β΅-steps: 16
    • E0 Jerk: 2
    • E0 max acceleration: 450
    Other than with the 8-bit board, these settings allow to use the Nimble with Linear Advance without any problems.

    Thanked by 1Samuel Pinches
    Post edited by Gandy on
  • Richy_TRichy_T Posts: 113🌟 Super Member 🌟
    Nice. I was just about to make a post if anyone had done anything like this.
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