At the moment the main application uses WPF for rendering. This is slow, however works well enough. I just don't want to write a camera and mesh rendering stuff in OpenGL right now, but the OpenTK protoype looks very promising.
As of right now, the application can read a given STL file and render it.
Next steps:
3D Printing Slicer with visionary features
This project is WIP, more info coming soon
Using this software may damage your printer, do not use unless you know what you're doing