I'm new to 3d printing and enjoying getting to know the Ultimaker2. I'm generating .stl files using the DesignSpark software from RS then converting to gcode using Cura (downloaded late December 2015). However, I'm confused about some of the decisions Cura is making:
1. See attached photo (CAN'T ATTACH THE PHOTO! - TIPS APPRECIATED. In the meantime perhaps you can help anyway). This print is meant to be a matrix of 20mm circles with 0.5mm walls, every layer the same - total height 5mm. The circles toward the centre print well and smoothly, but for some reason, the software decides to print the outer perimeter of the design in short bursts rather that smoothly, leading to the lumpiness which can be seen. The photo shows a "Normal print", if I chose "Fast print" the effect is so bad that the "lumps" don't even join up. I'd like to be able to fix the problem, but I'd also like to understand why the software is choosing to print identical parts of the design in two completely different ways. The material is Polyflex from Polymakr, printing at 227 degrees with the bed at 60.
2. I'm also frustrated with the support structure printing. Sometimes it doesn't print when I ask it to, and when it does print, sometimes it doesn't come up high enough to touch the material it is supposed to support! Any tips?
Thanks for your help,
Derek Ryden (UK)