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Problem with print quality & grinding

Mindstormsnxt

Problem with print quality & grinding
April 10, 2015 05:22PM

Registered: 9 years ago
Posts: 13

Hi everyone!

I´ve got a problem with my RepRap Prusa i3 (i3 berlin), if I print ABS, everything works fine, but the layer placement is bad, if I print with PLA, its even worser and it grinds at the same layer height every print...
I have no idea what could cause this, before it worked perfectly with layer heights of as low as 0.025mm.

Anyone knows why?

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Mindstormsnxt

Re: Problem with print quality & grinding
April 10, 2015 06:11PM

Registered: 9 years ago
Posts: 13

A picture of a failed PLA print...

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Attachments:
open | download - Unbenannt.PNG (479.1 KB)

ggherbaz

Re: Problem with print quality & grinding
April 13, 2015 12:23PM

Registered: 10 years ago
Posts: 1,401

It looks like you have bad inter layer adhesion problems. Probable printing either too cold for the filament or too fast for the temperature settings.

Also, do you have a fan to cool your extruder and a fan for the PLA part?

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Mindstormsnxt

Re: Problem with print quality & grinding
April 13, 2015 01:10PM

Registered: 9 years ago
Posts: 13

Hi,

thanks for the answer smiling smiley

I´m using an E3D v5 hotend, i´ve got cooling for the hotend and the PLA part, I have tried different temp settings with no better results...

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ggherbaz

Re: Problem with print quality & grinding
April 13, 2015 01:52PM

Registered: 10 years ago
Posts: 1,401

Can you tell me what speed, temperature and layer height you used for that part?

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Mindstormsnxt

Re: Problem with print quality & grinding
April 13, 2015 02:55PM

Registered: 9 years ago
Posts: 13

The speed is normal, not very fast so around 40mm/s or so.
Im using 215°C for the PLA, the layer height is 0.2mm.

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ggherbaz

Re: Problem with print quality & grinding
April 13, 2015 03:15PM

Registered: 10 years ago
Posts: 1,401

Those settings should be fine, so let's move to next question:

It's the hotend a real e3d or Chinese clone?
Does the stainless steel barrel have a PTFE liner or it's all metal? If it have a PTFE liner when was the last time you replace it?

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Mindstormsnxt

Re: Problem with print quality & grinding
April 13, 2015 03:31PM

Registered: 9 years ago
Posts: 13

Hi,

It´s an original one, I even replaced the whole thing, but it hasn´t changed anything...
I havent got an PTFE tube... (using 1,75mm filament)

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ggherbaz

Re: Problem with print quality & grinding
April 13, 2015 09:26PM

Registered: 10 years ago
Posts: 1,401

When you extrude in the air, does the filament falls straight down or it curls up?

Your idler bearing might be too tight or feedrate or steps per mm might be off.

Other thing to look at is the extrusion width, what size is your nozzle and can you measure the filament after extruding some to see if comes out at the right thickness?

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Mindstormsnxt

Re: Problem with print quality & grinding
April 14, 2015 02:11AM

Registered: 9 years ago
Posts: 13

It falls straight, the nozzle should ne clean...
Before it worked perfectly, I haven't set anything with the steps per mm.
I've normally got a 0.4mm nozzle, I'll check the extrusion width later.