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william.s40
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Filament flow Intermittent Inconsistency

Sun Mar 11, 2018 7:23 pm

FIRST POST. Greetings.

Printing from an i3MK2s
Filament type PLA from the MK2s kit package.
temps are all by the book 215/55

Problem: Image link below
When printing the V2 calibration file the filament bead that is laid down on the bed is imperfect. It starts as a blob then for the first two centimeters is good then by the third centimeter the filament bead thins out and appears to have too little filament then suddenly the filament thickens again and then thins again eventually the filament loses adhesion to the bed.

Observation:
When I run the load filament function, the shifting in volume of filament extruded does not repeat. The filament comes out smoothly and does not indicate a clogged nozzle or clogged gear

Things I have already done.
Checked the gears for gunk.
Run the extruder Load filament
Checked the tension springs on the filament door and set them to 14mm
Increased flow through slicer settings ( this caused blobs )
Slowed down speed to 80% ( this changed nothing )

Some background.
I am a newbie in to 3D printing. I built my MK2s from a kit and have successfully printed the whistle, and the Rhino skull. The frog keeps failing cause of lifting of the PLA off the bed. Now I am printing my own designs and cannot even get through printing the raft layer because of this problem with filament flow. HELP!

thank you.
https://imgur.com/aYZMIyg

FransKrau
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Re: Filament flow Intermittent Inconsistency

Sun Mar 11, 2018 8:43 pm

I think this is a typical Z adjust issue. See the forum about it (adjust Z my way). Use the Z adjust to lower your hotend so the filament is properly pushed to the heatbed.

Frans
Frans Krau
Europe, Holland, Apeldoorn

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william.s40
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Re: Filament flow Intermittent Inconsistency

Sun Mar 11, 2018 11:23 pm

Thank you .. I played with the Z axis a lot.. actually think i might have damaged the surface a little getting it too close. The filament practically embedded. If you look at the image from the original post you can make out scrape marks on the bed where i had to really dig with a rounded edge to break off the filament bead. I will try some more tinkering with the z. Most frustrating is that I had already successful prints and not going backwards.


rob.l6
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Re: Filament flow Intermittent Inconsistency

Mon Mar 12, 2018 7:48 am

Still smells a lot like either bad z height or partial blockage, or perhaps a bit of both.

For z height, don't use that file, try the calibration squares, something like https://www.thingiverse.com/thing:1776031

For a partial blockage, turn up the hotend temp to about 280C and stick the needle in out a few times.

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william.s40
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Re: Filament flow Intermittent Inconsistency

Mon Mar 12, 2018 9:49 pm

Ok. Thank you. I am convinced that it is a partial blockage that creates fluctuations in the flow volume. I loaded filament and it appeared to flow normal the first few times then all of a sudden it started looping up back to the nozzle. It formed a loop, knotted up then dropped with increased weight. Now.. The thing about this needle. I don't have one. Was it included in the kit and I missed it? Where does one acquire "acupuncture needles" . Thank you kindly for the generous advice.

rob.l6
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Re: Filament flow Intermittent Inconsistency

Tue Mar 13, 2018 2:02 am

Yes, they were included in the kit. Very small so easy to miss and throw out with the packaging.

As to getting some, online, or perhaps try your local physiotherapy clinic? But don't tell them why you want one :lol:

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william.s40
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Re: Filament flow Intermittent Inconsistency

Tue Mar 13, 2018 7:07 pm

I cannot source an acupuncture needle. Stopped by an acupuncturist and started talking about needing to clear a nozzle and they literally said they could not give me a needle because...... Insurance. What other options do I have. Fully disassemble? I cannot wait any longer. :cry:

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william.s40
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Re: Filament flow Intermittent Inconsistency

Tue Mar 13, 2018 8:33 pm

Ok. answered my own question. Treated my partial blockage like a full blockage. I went through the process of pushing a 1.5mm wire through the extruder. Pushed the filament out of the extruder chamber through the nozzle. Looked good coming out with each push. Once I wasn't getting any more filament release, I loaded new filament and the flow of the filament continued to curve back up to the nozzle, knot up, and then drop after accruing enough buildup to form what looked like a rope with a noose at the end of it ( is this printer possessed? )

rob.l6
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Re: Filament flow Intermittent Inconsistency

Wed Mar 14, 2018 12:37 am

But have you actually tried to do a test print since then? And you are the using the PLA that came with the printer?

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