ray.a2
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First print artifact

Tue Mar 13, 2018 7:05 pm

Hi,

I just put my MK3 kit together and ran my first print, the Prusa logo. It looked good for a first print, but I did have some odd spots where the extruder stopped. They sort of look like the extruder re-melted the PLA or just globbed it.

I looked online and only found this visual guide, but it did not have an item for my issue.

http://reprap.org/wiki/Print_Troublesho ... rial_Guide

I'm thinking either the live Z is still too close (-782, but prints look awesome to me though), or the extruder temp is too high (but I'm using the default Prusa settings).

Would someone be able to point me in the right direction on what to try?

Thanks in advance.

Ray
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ray.a2
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Re: First print artifact

Tue Mar 13, 2018 7:10 pm

BTW, some sort of visual troubleshooting guide like the link above would be awesome for the MK3, for noobs like me, to show common problems and solutions.

pieter jan.v
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Re: First print artifact

Tue Mar 13, 2018 7:25 pm

Hey,

I'm having almost exactly the same prusa logo as you have! I'm also new to 3d printing and looking to improve the print. Hopefully someone can help us :).

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joan.t
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Re: First print artifact

Tue Mar 13, 2018 7:32 pm

Hi Ray,

this looks like a bit of over extrusion. have you updated the firmware yet?

if not, I would do a Factory reset, and firmware update. then re calibrate and try again...

with over extrusion, the nozzle ends up ploughing through the deposited filament and causing roughness,,,


the little swirls are probably caused by the wipe process before retraction, this will pretty much dissappear once the over extrusion is sorted...

have a look at this site https://www.simplify3d.com/support/prin ... eshooting/

regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

ray.a2
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Re: First print artifact

Tue Mar 13, 2018 7:46 pm

Joan,

Thanks for the reply.

Yes, I am running the latest 3.1.3 firmware. I updated it before first run or calibration.

I then ran the XYZ calibration and first layer calibration to get the Live Z setting to where it was at.

I also checked the downloads and made sure the SD card files were the latest on the website before printing the sample. The Prusa logo was printed from the Prusa gcode files with no changes.

I did not see a similar issue on the SImplify3D link you supplied. Let me know if I missed it though.

If not a firmware issue, is this normally seen with the stock prusa settings?
Do I need to change the extrusion rates on the supplied files, or should I be looking at some mechanical fix first?

christopher.o3
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Re: First print artifact

Tue Mar 13, 2018 8:20 pm

ray.a2 wrote:
Tue Mar 13, 2018 7:46 pm
Do I need to change the extrusion rates on the supplied files, or should I be looking at some mechanical fix first?
When the first layer starts printing, drop the flow by 3 or 4 in the "tune" menu and see how it looks. It's easier to do that than to change something mechanical and realize it was better before.

curtis.c2
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Re: First print artifact

Tue Mar 13, 2018 8:39 pm

ray.a2 wrote:
Tue Mar 13, 2018 7:46 pm
If not a firmware issue, is this normally seen with the stock prusa settings?
Do I need to change the extrusion rates on the supplied files, or should I be looking at some mechanical fix first?
You can try changing extrusion as suggested, but the rest of the print doesn't look horribly overextruded and isn't bad at all otherwise. I would sooner re-slice it and play around with restart and coast settings. I know thats an sd card print, but a couple of globs doesn't make for concrete evidence to change your extrusion multiplier.

print some other stuff and have fun.

bartosz.c2
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Re: First print artifact

Tue Mar 13, 2018 10:38 pm

Hi, I was going to post exactly same issue problem with MK3.
I got this problem with prusa original filament and others also.
And issue occurs also on gcodes created by me (look at triceratops).
Any help appreciated.
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CameraZOOM-20180313231733422.jpg
prusa original gcode
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CameraZOOM-20180227234957862.jpg
my gcode
CameraZOOM-20180227234957862.jpg (1.42 MiB) Viewed 447 times

ray.a2
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Re: First print artifact

Tue Mar 13, 2018 11:24 pm

Pieter, Bartosz,

Are you both on 3.1.3 firmware?

I'll post a picture of the rest of the print in a bit, but since the rest of the print looks great, so I was a bit hesitant to change too much.

I did see that some extrusion changes were made to 3.1.3 buy I could not find the changelog to see that was changed beyond the lcd display.

stephen.h14
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Re: First print artifact

Tue Mar 13, 2018 11:50 pm

FWIW, I haven't updated my firmware yet, I'm still on 3.1.1 and I believe I have the same spots on the logo:

Image

A question for the more experienced makers- On the bottom of the print, the side against the PEI sticker, should it be completely glass smooth or can you feel tiny ridges if you scratch your fingernail over it? TIA

Image

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