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Samson

Discussion in '3D printers' started by runninfarmer, May 30, 2015.

  1. runninfarmer

    runninfarmer Veteran
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  2. runninfarmer

    runninfarmer Veteran
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    Got some work done on the XY axes. Had to make some dado cuts with my circular saw for my belt paths. Need to finish up my extruder carriage then it'll be ready for electronics. Here are some pics:
    image.jpg image.jpg image.jpg image.jpg image.jpg
     
  3. runninfarmer

    runninfarmer Veteran
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    Got the X carriage done and one of the belt paths done. Also laying out the 21"x20"x 1/4" aluminum build plate.
    image.jpg image.jpg image.jpg
     
  4. Mark Carew

    Mark Carew OpenBuilds Team
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    This Build is looking great! @runninfarmer
    What size prints will be possible on the Samson?
    Mark
     
  5. runninfarmer

    runninfarmer Veteran
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    Thanks Mark! Currently the print size is roughly 11" x 21" with total build size at 24"x27"x24". I lost a lot of print area in the x-axis due to my carriage plates. I'm sure it can be optimized, but I was willing to sacrifice some for good rigidity and convenience.


    I've also made some significant design changes on the z-axis. I found having 4 z-axis motors was a mess to wire to my RAMPs board. I'm going to try a closed belt driven setup with a 5:1 geared nema 17 motor and 3 screws. Will make the wiring much simpler with a single motor.
     
    #5 runninfarmer, Jun 22, 2015
    Last edited: Jun 22, 2015
  6. Mark Carew

    Mark Carew OpenBuilds Team
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    Still thats a great size for a printer as rigid as it is. I say great job! :thumbsup:
    I like the idea of simplifying the table motors down to one. I think over all it will make for a much easier build.
    Mark
     
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  7. runninfarmer

    runninfarmer Veteran
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    Got the new 3 screw z-axis setup with my geared Nema 17. Utilizes 77" closed loop XL timing belt and aluminum 25 tooth XL pulleys. Also finished XY belts. Ready for movement tests:
    image.jpg image.jpg image.jpg
     
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  8. stargeezer

    stargeezer Veteran
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    I wonder if you could get more belt contact on the z stepper motor if you were to side it closer to one of the corners? It looks like it could slip a "tooth" unless the belt is very tight.

    Also, with the size of the "lift" would a small nema 23 be a better choice? If you have any problem with the 17 being under powered and you don't already have one to try, I have a few recycled nema 23, 130 ozin stepper motors, and I'd be happy to send you one to try out. I've ran these with a with a ramps board with full power and standard ramps chips. No obligation, I'm excited by this build and wouldn't want to see it stalled for lack of a stepper.

    Larry
     
  9. stargeezer

    stargeezer Veteran
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    Never mind the idea about moving the motor. I wasn't getting all the pics, just the second one.
     
  10. runninfarmer

    runninfarmer Veteran
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    Hi Stargeezer, thanks for your interest! I agree, belt slip on the z-axis pulleys is a concern for me. I'm limited by the length in closed belt I could get from McMastercarr. The longest length was 77". I thought about doing a two belt approach, which I may still try. I found with the current z-axis belt my filament is going to be rubbing against it. That may or may not be an additional issue. I've been busy the past couple weeks with my first child so I haven't been able to get further on it. Hopefully I can get my electronics installed and some movement tests done in the next couple weeks!
     
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  11. stargeezer

    stargeezer Veteran
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    "Busy with your first child" Oh Boy, do I know that trek! Mine is 38yo and sometimes I think she's really a newborn. :) That said the experiences and joy of those first days are as sharp in my memories as anything in my 60 years. Your priorities are in the right place my friend and when life allows you to be involved with thing of much less importance, we'll be looking for a update.

    Blessings to you and your first. :)
     
  12. James_Hopkins

    James_Hopkins Well-Known
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    Any updates on this project?

    I'm loving this design. I am a welder fabricator by trade. I'm thinking this design will be my first 3D printer build. I like how you are able to build it without any 3D printed parts since I don't have a 3 d printer yet.

    I was thinking instead of drilling custom brackets out of aluminum I would just use gantry plates from the openbuilds parts. It would make it more modular.

    How did you make the bearing mounts for the Z axis lead screws? I was also thinking I will put the Z axis motors on the bottom with the belts so I don't bump into them.

    I would love to see some updates on this project. Maybe even some photos or even a video of it printing.
     
  13. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    If you're feeling constrained by belt length SDP/SI has them all the way up to 118 inches.

    XL belts.jpg
     
  14. runninfarmer

    runninfarmer Veteran
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    Hi James, thanks for the compliment! Like you mentioned I realized I was going to be bumping into my belt path frequently with my filament and hotend wiring. I'm going to redesign it so that the belt path runs at the bottom. I've suspended progress on it since I've been busy finishing up grad school and raising my first born, :). They bring a lot of joy, but man they hurt your projects, ;). Hopefully soon I can finish it, lol. Still need to finish the holder for my extruder, and set up my endstops. My bearing mounts were 3D printed; I've attached the .stl file and .scad file. I will try to get some more progress done in the coming weeks and post pics of the redesign.

    Thanks for posting that link Rick! That will help having additional options for belt lengths
     

    Attached Files:

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  15. Val Cocora

    Val Cocora Veteran
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    hi farmer,

    been down the new born avenue already.
    well, my son is going on 4 soon, but playing horsey with daddy is most exciting when daddy is busy soldering those thin 26 ga. wires to the contacts of the end stops.
    needless to say, when you're soldering with a toddler going giddy up on your back, most likely you have to redo your work. talk about project hurting, huh?
    regardless, he is my finest '3d print' work ever.
    I wish you and your family nothing but the best.
     
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  16. runninfarmer

    runninfarmer Veteran
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    I have a hard enough time soldering wires to endstops, can't imagine trying it with the little one, lol. I totally agree with you on our best work. Thank you for the wishes and wish you the best as well, Val!
     
  17. runninfarmer

    runninfarmer Veteran
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    Hi Wombaticus, thanks for the comments! I've been slacking on this build. Yeah, I wasn't thinking when I put my Z-axis belt at top. I'm going to reconfigure the whole thing to have it at the bottom. I may also change up my X and Y axes to get more of a square print area. I've never had good luck with bowden but I may try both configurations. I have a little more time now, so I can resume work on it.
     
  18. stargeezer

    stargeezer Veteran
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    Hi Farmer, happy to see you are working on things again. We need BIG BUILDS!

    Blessings to you and yours as we head into Christmas!

    Larry
     
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  19. runninfarmer

    runninfarmer Veteran
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    Merry Christmas to you Larry! Samson's been moved to my science classroom. Got it tore down. Gotta do some designing. Looking like I'm gonna have to order some longer leadscrews. If anyone has 3 1 m long screws, I have 6X 450 mm screws I'd trade for them. Anyhow here are some pics: image.jpeg image.jpeg image.jpeg
     
    #20 runninfarmer, Dec 13, 2015
    Last edited: Dec 13, 2015
  20. Slobberknocker

    Slobberknocker Journeyman
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    Oh man! I so want to touch it right now.:D
     
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  21. JustinTime

    JustinTime Master
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    The guy in the back touched it! You sure you want too? :D
     
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  22. runninfarmer

    runninfarmer Veteran
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    lol, yea that's Stiff. There's a muscle man also, we call Biff. You gotta watch those two carefully
     
  23. runninfarmer

    runninfarmer Veteran
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    After graduating, moving and finally settling in I have time to get back to this project. I've decided to abandon the XYZ gantry and combine this design with my Core-V design. I'm now going to have a moving table and have the CoreXY kinematic a on the top. This also eliminates the complicated machining I had done previously. This way you can use the V-slot for the idlers. Here's a couple pics:
    image.jpeg image.jpeg
     
  24. stargeezer

    stargeezer Veteran
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    Great to see the progress! And the design mods. I was looking back through your build pics a couple weeks ago, looking for some inspiration for my next printer build. :) I don't want to spill the beans yet, but after playing with the notion of a fixed bed for months, I had finally decided that the bed HAD to move.

    If you are still seeking 1 meter long Acme screws, what diameter do you need? I'm a hardware junkie (my wife spells it a-d-d-i-c-t :) ) I just might have some. I need to check. I'm pretty sure I have 36" pieces, but I don't know about 1 meter.
     
  25. runninfarmer

    runninfarmer Veteran
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    Hi Larry,

    Good to hear you have another build in the works! Looking forward to seeing it on here! I agree, it's just easier to have a moving bed. I'm getting more build area now that I'm utilizing the top frame for XY.

    I lucked out and can use the same screws from before with the moving table. Thanks for the offer though ! Just have to redesign my XY motor mounts and then I'll be waiting on parts and a couple more plates to fab. Then I can run through some movements finally
     
    #26 runninfarmer, Mar 25, 2016
    Last edited: Mar 25, 2016
  26. runninfarmer

    runninfarmer Veteran
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    Got mechanicals pretty much done, waiting on some belts and motors. Have a decent size gap between bed frame and hotend carriage. May have to mount build plate on some long springs or spacers. Hate to give up utilizing the top of frame did idlers and such. Here's a few more pics:
    image.jpeg image.jpeg image.jpeg
     
  27. JustinTime

    JustinTime Master
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    I don't think that the number of teeth that grab the pulleys are enough. Especially on the stepper. It will slip at the first incident of hard work.

    Just my $0.02 :)
     
  28. runninfarmer

    runninfarmer Veteran
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    Hi Justin,

    That has been a concern of mine but I'm going to try it without modification first. I've tested it and saw no slipping. It's already holding up significant weight. I may not do autoleveling so it wont' be constantly moving, just continuous fine z-axis stepping. I'm not blinded to the potential issue though, if need be I'll add spaced idlers for those pulleys, and I can move the stepper around to get more belt length.
     
  29. runninfarmer

    runninfarmer Veteran
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    Got my parts in. CoreXY motors are mounted along with belts and stacked idlers. Just need to get limit switches mounted and my electronics and it will be ready for movement tests.
    image.jpeg image.jpeg
     

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