hollow pyramid test piece

[bigalstew]

What's the secret to getting good results on the hollow pyramid?
I've calibrated my rostock accurately,I think.
I'm getting a very 'knobby' finish, especially in the interior of the legs.
I have set all the parameters in the slic3r file to those downloaded from Seemecnc.
Any help will be appreciated. I'm a newbie at 3d printing ,as you can tell.

[bubbasnow]

throw up a pic

[Tinyhead]

Need to get a fan on there. Mine still end up like that but only on 2 legs. Those 2 legs are on the backside of the legs closest to the fan so they don't see much air and will droop a bit.