I've designed a sword for a cosplay i'm working on which has an internal channel to thread an LED strip. Unfortunately my print has scarred and brittle walls... but only where there is internal structure. The same print has a column of just hollow material which prints beautifully, on every single layer in parallel with the messed up stuff. My best guess is too many retractions right now and i'm running some tests, but it's a slow process and maybe someone else has a better idea. I've posted pictures and the stl file here: http://www.thingiverse.com/thing:1707999 and I'm printing with T-Glase at 215 C / 70 C table. Again the hollow column is strong and beautiful so I don't want to mess with the any other settings, just slicing and maybe CAD. Thanks so much!
P.S. In the picture the left leg fell off, that's how bad the print is. It just has some goopy epoxy on it right now. And yes there was supports under the triangle but the bad quality continues above it for the rest of the 6" of height it has.