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Penwiggle
(@penwiggle)
Eminent Member
Prints failing at 80%+ done

Hi everyone,

Have been having an issue with my Mk3 recently, where a number of prints come free of the build plate when the print is nearly finished. Anywhere from 80% or 90% or closer to being done, and the print shifts free.

This has happened with prints with a large footprint, and those with a small footprint. Prints that I think are quite chunky with a lot of it in contact with the build plate, still come loose when it's nearly finished.

I have ensured the Z value is set right, several times. My extruder is running at 210 degrees, and print bed at 50. I've tried different filaments from different suppliers.

Any thoughts?

Renee

Napsal : 04/10/2018 8:42 pm
bobstro
(@bobstro)
Illustrious Member
Re: Prints failing at 80%+ done


[...] Have been having an issue with my Mk3 recently, where a number of prints come free of the build plate when the print is nearly finished. Anywhere from 80% or 90% or closer to being done, and the print shifts free.
Any failure due to parts physically moving on the bed usually has at least some bed adhesion cause. The quality of your 1st layer is directly related. If you haven't already done so:

  • The importance of a clean bed cannot be over-stated. Dunk it under the sink with water & some dish soap. Above all else, avoid touching it. Use 91%+ isopropyl alcohol between prints (not necessarily every print) and 100% acetone if alcohol starts to fail. When acetone stops working, dunk it under the sink again. Use a very mild abrasive pad if everything else fails.

  • Make sure your 1st layer is going down properly. The "life adjust" procedure is recommended. Your 1st layer is literally the foundation that everything else is built on. If it's poor, the rest of the print is a house of cards.
  • If these measures aren't sufficient, you may need to consider printing with a brim as "training wheels" for extra adhesion, particularly if the parts touching the bed are small. A full raft is usually not required.

    My notes and disclaimers on 3D printing

    and miscellaneous other tech projects
    He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

    Napsal : 04/10/2018 9:18 pm
    RobertB67
    (@robertb67)
    Trusted Member
    Re: Prints failing at 80%+ done

    Raise the bed to 60, it will help with bed adhesion. 😀

    and just follow the cleaning listed above, use 91%+ isopropyl alcohol between prints on the bed,...

    Napsal : 05/10/2018 8:16 am
    imod.systems
    (@imod-systems)
    Honorable Member
    Re: Prints failing at 80%+ done

    A friend of mine has been attempting to print a large object that keeps failing. The magnets aren't strong enough to hold the spring steel sheet to the bed and the spring steel sheet keeps dislodging. He's been using binder clamps to keep the sheet down.

    Napsal : 05/10/2018 5:23 pm
    bobstro
    (@bobstro)
    Illustrious Member
    Re: Prints failing at 80%+ done


    A friend of mine has been attempting to print a large object that keeps failing. The magnets aren't strong enough to hold the spring steel sheet to the bed and the spring steel sheet keeps dislodging. He's been using binder clamps to keep the sheet down.
    I'd contact support. The magnets should be plenty strong enough to hold the sheet down.

    My notes and disclaimers on 3D printing

    and miscellaneous other tech projects
    He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

    Napsal : 05/10/2018 6:32 pm
    RufusClupea
    (@rufusclupea)
    Reputable Member
    Re: Prints failing at 80%+ done



    A friend of mine has been attempting to print a large object that keeps failing. The magnets aren't strong enough to hold the spring steel sheet to the bed and the spring steel sheet keeps dislodging. He's been using binder clamps to keep the sheet down.
    I'd contact support. The magnets should be plenty strong enough to hold the sheet down.

    +1 Mine are so strong it's scary. Even if slightly off-center, once that plate is down, it ain't going anywhere until I pry it off again.

    That's "MISTER Old Fart" to you!

    Napsal : 05/10/2018 6:55 pm
    imod.systems
    (@imod-systems)
    Honorable Member
    Re: Prints failing at 80%+ done



    +1 Mine are so strong it's scary. Even if slightly off-center, once that plate is down, it ain't going anywhere until I pry it off again.

    My forum search ninja skills aren't working today but there was another thread where a user printed a huge box and their steel sheet started to lift off the bed as well. Yeah, it sounds out of the ordinary but I don't think it's a failure of the magnets or the build surface. I think it's just the print.

    Napsal : 05/10/2018 10:27 pm
    Penwiggle
    (@penwiggle)
    Eminent Member
    Topic starter answered:
    Re: Prints failing at 80%+ done

    Thanks everyone for the feedback. Doesn't look like I was missing anything majorly wrong, just need to fine tune my printing and cleaning regimen.

    I do sometimes use a brim, especially if there is minimal contact surface with the plate, and I find that generally solves the problem. I much prefer brims over rafts, and find that a raft is overkill 99% of the time.

    I'm probably not as consistent with the surface cleaning as I could be, and will give this more attention this week.

    My old printer, which didn't have the ability to fine-tune the Z axis, usually required a layer of glue to get the prints to stick. I am SO SO SO loving the Mk3 with its removable build plate, that when done right, doesn't require glue.

    Thanks again,
    Renee

    Napsal : 08/10/2018 11:53 am
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