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Dalemaunder

Visible lines in first layer and bubble-like indentations?

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Hey guys,

I printed out a case for my phone to see how well the printer was handling large solid layers, I've tried searching for the problem myself for a little while but the answers I've found seem to be contradicting themselves.

I're read that the fix for the lines is getting the print head closer to the bed, but the answer for the bubbles is to raise it.

Here's a picture of the print in question: ucg5niL.jpg

The bottom left corner is super smooth line-wise but it does have a little bit of bubbling.

PLA at 50mm/s, 205C hotend, 70C bed. I've seen a couple of places say that 70C can be too high for PLA and yet a lot of people say 70 is recommended so I'd love some clarification on that.

Thanks.

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70C is quite high and higher then the glass transition temp of most PLA's

the default temp on UM2 is 60C and I also print at 50 all the time.

You can also get those bubble marks where it doesn't stick, you can see it peel up as it goes over those points when printing the first layer. maybe where you touched it or oil dripped on it. A good clean with Alcohol may help.

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70C is quite high and higher then the glass transition temp of most PLA's

the default temp on UM2 is 60C and I also print at 50 all the time.

You can also get those bubble marks where it doesn't stick, you can see it peel up as it goes over those points when printing the first layer. maybe where you touched it or oil dripped on it. A good clean with Alcohol may help.

 

Thanks for the info, It's in the middle of a print at the moment but I lowered the temp down to 55 before it started to see how it went.

I'll give it a clean after the print finishes, thanks.

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