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Need help diagnosing failed first prints  

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ryanmeyer
(@ryanmeyer)
Active Member
Need help diagnosing failed first prints

I've attached a picture of two models that started great, but ended a stringy mess. Somewhere around the hour mark for each print I hear a loud clicking noise that gets my attention. A few minutes later, I walk over and see strands of filament going everywhere. As far as I can tell each print starts great so I'm confused as to what the root cause could be. From many searches online I've come up with my own short list:

* Under extrusion

* Overheating hotend? (Some people say to blow a fan on the print area?)

* Extrusion length? I suppose this has to do with how much filament is being let through?

Hoping someone here will give me the right words to describe the problem I'm having. =)

Posted : 17/07/2019 2:22 am
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(@)
Illustrious Member
RE: Need help diagnosing failed first prints

A close up photo of the bottom of the parts will be helpful, as will an image of the print bed you are using. 

But looks like (and I am guessing from the appearance) the parts are coming loose during printing.  Both parts have plenty of surface area to adhere well - so not a part problem.   When parts have adequate surface area, this adhesion problem comes down to two main causes: finger prints on the bed (and alcohol isn't great at removing finger prints); and layer 1 calibration.  The requested photos will help determine which is the biggest factor.

 

 

Posted : 17/07/2019 7:48 am
ryanmeyer
(@ryanmeyer)
Active Member
Topic starter answered:
RE: Need help diagnosing failed first prints

Here are some more up close pictures. Note that I slightly scored the printing surface during my last z-axis calibration.

Posted : 17/07/2019 8:27 pm
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(@)
Illustrious Member
RE: Need help diagnosing failed first prints

Trying printing one of these ... it should pull off the bed similar to good masking tape. 

Cal Circles

ps: the bottom of the printed parts is what's important to see to gauge layer 1 properties.

This post was modified 5 years ago by --
Posted : 17/07/2019 8:50 pm
ryanmeyer
(@ryanmeyer)
Active Member
Topic starter answered:
RE: Need help diagnosing failed first prints

Attaching a few images from the 100mm model. Seems like I have a few issues. 🙁 The layer did come off similar to masking tape.

Posted : 18/07/2019 11:28 pm
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(@)
Illustrious Member
RE: Need help diagnosing failed first prints

When layer 1 is correct, and the offset has been set correctly, the piece should be a solid welded sheet of plastic.

While printing the circle, open the menu Tune: Live-Z and adjust the value more negative until the extrusions begin to weld together.  Make small changes, -25 um at a time, watch for the result, then add another -25 - keep going until you see the threads welding to the last pass.

Also, Jeff's "Life Adjust My Way" post  [sic] is recommended by most, and folks seem to be able to follow the method he suggests.

 

Posted : 19/07/2019 5:10 am
ryanmeyer
(@ryanmeyer)
Active Member
Topic starter answered:
RE: Need help diagnosing failed first prints

The circle model worked great for me. Was able to print a pretty solid benchy and also managed to print a flexi-raptor! I'm very thankful for the link to the post and the quick responses.

 

Thanks!

Posted : 20/07/2019 3:03 am
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(@)
Illustrious Member
RE: Need help diagnosing failed first prints

Good to hear ... and now that you have layer 1 down; keep in mind finger prints are your nemesis.  Never touch the print surface with fingers.  And if you do, using a fresh paper towel as a scrubber with dish soap and hot flowing water is the best way to get the surface back to printable. Then handle the bed only by the edges.

This post was modified 5 years ago by --
Posted : 20/07/2019 9:44 pm
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