New features:
Experimental "Wipe" feature that retracts while moving back along last path (useful for Bowden extruders)
New "spiral vase" option for extruding while raising Z continuously (works with any number of solid layers)
Automatic version check
New option to remember last output directory
New command line --autosave for better integration with host software (automatically export configuration to a given file)
Improvements:
Memory usage was reduced enormously thanks to fixed memory leaks in upstream libraries
Many speed improvements (also thanks to J. Vincent and M. Hindness)
Bridge overlap was reduced to improve bridging
Rectilinear and line infill is now aligned across layers
Brim loops are ordered in a smarter way
Limit "Only Retract When Crossing Perimeters" to travel moves that are completely encosed in the upper layer's slices so that we avoid visible traces on top layers
When fill density is 0, don't extend solid layers and ignore Solid Infill Every 'n' Layers
The inwards move at the end of an external loop only takes place when we have more than one perimeter
Generate a better error when input file is too thin and no layers could be generated
Better compatibility with MakerBot/MakerWare and Sailfish G-code flavors (including dual extrusion)
Order objects using a nearest neighbor search instead of relying on the order in plater
Use G1 instead of G0 for restart after retraction to avoid problems with Mach3 blending it with previous travel move
Changes:
The "Disable fan for first 'n' layers" is now applied even if cooling is disabled, just like "Fan always on"
Concentric infill order was reversed so that smaller loops are printed at the end
The "makerbot" G-code flavor was renamed to "makerware"
Bugfixes:
Fixed crash with Simple mode
Cooling time estimates were not correctly computing all objects in a plate
Allow 0.1mm slots in models instead of merging them
Z wasn't always moved at travel speed
Scaling object from the plater applied scale factor over the factor used in the previous slicing job
Fixed regression causing skirt_height to be honored incorrectly when printing more than one object
Superfluous extra perimeters were generated
Fixed crash when user deleted object from plater before thumbnail was generated