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Gaps in prints and printed object is not strong(breaking)

bentech4u

Gaps in prints and printed object is not strong(breaking)
August 03, 2020 06:11AM

Registered: 9 years ago
Posts: 45

HI

i was creating a new printer(prusa model). print quality is good and no lines in prints. but i can able to see small gaps in every print.

If i print big models, which is breaking while removing support itself.

i am attaching some pictures referring to my issue

silver/gray color is acccreate PLA
Green one is Sunlu china
Yellow one is Sunlu china

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VDX

Re: Gaps in prints and printed object is not strong(breaking)
August 03, 2020 06:44AM

Admin
Registered: 16 years ago
Posts: 13,948

... slightly higher temp will fuse better ... but there are some tiny "zickzack-waves" visible too in the layers, what could be caused by extruder variations (too much extrudate or too slow) ...

Viktor
--------
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bentech4u

Re: Gaps in prints and printed object is not strong(breaking)
August 03, 2020 07:12AM

Registered: 9 years ago
Posts: 45

you mean to say extruder calibration also required ?

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Ohmarinus

Re: Gaps in prints and printed object is not strong(breaking)
August 03, 2020 07:36AM

Admin
Registered: 11 years ago
Posts: 3,096

Do you hear any pops coming from the nozzle during printing by any chance?

http://www.marinusdebeer.nl/

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bentech4u

Re: Gaps in prints and printed object is not strong(breaking)
August 03, 2020 02:01PM

Registered: 9 years ago
Posts: 45

hi heard some, i thought it's skipping steps or extruder. or the filament is slipping . after that i reset extruder, tightened tension springs, still same,...

haring some time, not very often

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jefbed

Re: Gaps in prints and printed object is not strong(breaking)
August 30, 2020 05:58PM

Registered: 6 years ago
Posts: 45

What kind of stepper drivers are you using? What is your extruder stepper driver's VREF? What kind of hot end are you using? What kind of extruder are you using?

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bentech4u

Re: Gaps in prints and printed object is not strong(breaking)
August 31, 2020 12:41AM

Registered: 9 years ago
Posts: 45

HI

my board is MKS-BASE v1.4, which uses 4982 as a motor driver. and my extruder is mk8 extruder(direct drive)

VREF, i didn't measured yet

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jefbed

Re: Gaps in prints and printed object is not strong(breaking)
August 31, 2020 02:03AM

Registered: 6 years ago
Posts: 45

I haven't used 4982 drivers before, but with 4988 drivers, which may be similar, I have to set VREF so 750mV to get the clicking to stop. Using an E3D v6 hot end below my MK8 extruder in a direct drive configuration works well.
If you still experience clicking, I'd recommend going with a geared extruder such as the Titan or Greg's Wade's one.
The gaps occur when the nozzle loses pressure, such as when a step is lost and clicking is heard.

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bentech4u

Re: Gaps in prints and printed object is not strong(breaking)
September 15, 2020 02:26PM

Registered: 9 years ago
Posts: 45

HI

i just checked VREF and it is 850mV. also i have ordered Titan

as you said, 4982 and 4988 drivers are similar,