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Another printer (it is a disease, once you start collecting them...)

Discussion in 'Projects' started by mark tomlinson, Oct 28, 2016.

  1. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yeah, bowden. First time for us too.

    Well now, this is cool. With Repetier firmware and a RAMBO board you can control the current to the stepper in code.. It is set in CONFIGURATION.H

    That is neat. Easier than breaking out the meter and tweaking pots.

    I think I need to bump the extruder drive current a bit.
     
  2. danzca6

    danzca6 Well-Known Member

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    That is cool. Much more precise than playing around dialing the pots in correctly.
     
  3. Geof

    Geof Volunteer Moderator
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    Hey! Wheres you find a fuse ? Or is it a bent paperclip until tomorrow ;) cant wait to see the print.
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Frankly, to stop the skipping all I had to do was remove the cosmetic panels from the side of the top and get more air in there.
    The steppers are running ... quite warm. I will probably add some more DC fans on there. They have one, rather small, DC fan that cools the RAMBO and I think we need more airflow,


    (edit: I called the RAMBO a RAMPS -- newb mistake)
     
    #45 mark tomlinson, Nov 2, 2016
    Last edited: Nov 3, 2016
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  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    and it is a noisy beast already... more fans will not fix that :)

    but 36 inches of build volume ... Oh my!

    And I guess I need to clean up the mess from building it now.
    .
    .
    .
     
    #47 mark tomlinson, Nov 3, 2016
    Last edited: Nov 3, 2016
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  8. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Finished. I think I finally have it dialed in :)

    20161103_175217[1].jpg
     
  9. Geof

    Geof Volunteer Moderator
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    Holy mother of delta. Tgat is one nice lookin machine ! Thank you for sharing...now where is max build size print:)
     
  10. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    It is roughly a 12 inch circle that is 36 inches tall.
     
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  11. Geof

    Geof Volunteer Moderator
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    That would be one huge print :)....DO IT!!!!! lol
     
  12. daniel871

    daniel871 Well-Known Member

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    Print a 3dBenchy Barge like I did.
     
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  13. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Well, turns out the issues I was having with the extruder (effector) was really a bad extruder stepper motor.
    I went through tweaking the Repetier firmware to increase the motor drive currect (like you would do with a screwdriver on the Robo) and the stepper completely died.

    Ordered a few more and will tackle this again next weekend :)

    I have gotten really good at field-stripping the effector. I can have that puppy apart and back together in no time.
     
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  14. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    So I took a no-name Nema 17 I had sitting around and plugged it on for giggles.
    It was not quite as torquey as the stock one, but not super weak. Same crap. Skips/pop/stutters.
    Could not extrude more than 50mm at a shot without a skip.

    Arggh. We had even rebuilt the hotend (again) with the bowden tube pre-inserted all the way into the heatbreak. Same for the EZR Extruder.

    Their support suggested another spool since that one may be OOS diameter-wise... Not buying it.

    So after some pondering I thought what if we crank the heat up? I jacked it all the way to 225c ?


    did a test extrude 50mm... no problems, 100mm no problems, 150mm no problems.

    Well crud. I still am waiting on feedback from them, but at least I can get extrusion working. Maybe we really do just need to run it hot, but... my concern there is that PLA run that hot will be a stringy mess. Sure, I could use some flavor of PET or some nylons and not have that issue, but those cost more :) I like my cheap-as-dirt PLA.

    Still looking into it, but that seems like a positive outcome. The replacement stepper will be in hopefully by the weekend, early next week latest.
     
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  15. danzca6

    danzca6 Well-Known Member

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    What temp were you before? Tried backing down 5C increments to see if you can still extrude ok? Or get a Bondtech and RAM that PLA in there :)
     
  16. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I am going to print and use a Gregs Wade I suspect.
    We were trying to use 'normal for teh Robo' temperatures to print and .... not getting it done :)

    Someone posted on thingiverse a modified gregswade that works with this model so I am likely to end up there.
    But.... if I stay with the EXRstruder ... flexible filaments are a non-issue ... decisions, decisions...
     
  17. danzca6

    danzca6 Well-Known Member

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  18. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  19. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Just an FYI. I was looking at a replacement RAMBO board when troubleshooting the issues, because .... spares.
    Damn... those are non-cheap. It is almost cheaper to buy every electrical and and mechanical component for a Robo than a spare RAMBO :)

    They are a tad pricey.
     
  20. danzca6

    danzca6 Well-Known Member

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    Well...what the hell are they doing a kickstarter for? Hahaha
     
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