Problems with finish on underside of print

[AndiG 0]

Hi there, new to 3D printing and having problems with recesses on underside of prints. Not really experimented with settings but it seems to have gotten worse the more I do so I'm thinking it's the hardware and not a software issue. Any ideas would be appreciated.

Picture attached.

Edited July 29, 2015 by Guest

[gr5 989]

That's normal. The 3 parts on the left have relatively easy bridging but that hole in the right 2 parts (I know I'm counting the same part twice) is extra tricky. Can you flip these parts over and print them the other way or some other direction down?

The trick for these "bridging" issues if you have to do it is to use lots of fan, print a bit cooler and use an extra good quality filament but this is actually pretty good - I've seen filaments that do much worse.

You could put in some support - for example a cylindrical wall that supports that round hole would help the layer that looks bad - and if you do it right (maybe it's just .2mm below with a gap) then you might be able to just break off the support.

But like I said - best to rotate a different side down.