First print rounded/rough corners

[joe 0]

I am new to Ultimaker and just finished building my machine. I am working through the Essential Calibration on Thingiverse. The .5 mm thin wall and 20mm box looked good.

I noticed a few issues when printing the 50mm tower http://www.thingiverse.com/download:17276. The first 5mm look good. Then I noticed the corners of two sides started to get rough and almost round a little bit. The entire tower printed, but I have two corners that indent and get worst as it kept printing.

Any ideas where I should look first?

I am printing PLA.

[Daid 306]

Most likely the corners are curling up, a better cooling shroud or a lower printing temperature could help.

[joe 0]

Thanks for the tip I will try both of these.

joe