This is another alpha release of PrusaSlicer 3.0.0. It fixes crashes when adding or selecting MMU printers and missing geometry
when slicing merged parts, both introduced in 3.0.0-alpha13, and several other issues. Please read change logs of 3.0.0-alpha11, 3.0.0-alpha12 and 3.0.0-alpha13 for more detailed description of the new features with respect to 2.9.7.

To let you enjoy the alpha without worries, the alpha builds save their profiles into the PrusaSlicer3-dev directory, so you may use the alpha side by side with the current release without ruining your production configuration. The configuration folder is different from what PrusaSlicer 2.x is using, meaning that PrusaSlicer 2.x and 3.x can run alongside each other without any conflicts.

Changes with respect to 3.0.0-alpha13

• Fixed a crash when selecting a Prusa Connect printer with an MMU, caused by missing feeder information in the hardware configuration (#16210).
• Fixed a crash when adding an MK4S MMU3 printer after updating profiles from 1.0.20 to 1.0.21.
• The "Extruder Assignment" button in the right panel now behaves like the "Print Goals" button: it toggles the Extruder Assignment dialog, appears checked while the dialog is open, and is highlighted when extruder assignment options are modified.
• Editable combo boxes in the right panel (e.g. Fill density) now show the "mixed" state when several objects with different values are selected. Previously, the value of the first object was shown.
• The Legend window in G-code Preview now has a minimum size, so it can no longer become too small to use (#15916).
• Fixed missing geometry when slicing merged parts that do not touch each other: only one of the parts was sliced (#16214).
• CLI: fixed applying per-tool setting overrides when slicing for a single-tool printer. Slicing errors reported by the CLI are now more readable.
• Objects with an empty outline are no longer silently skipped during arrange, so they are correctly reported when arranging finishes.
• Fixed right mouse button clicks that were sometimes ignored, for example after a small camera movement. Right-clicking the bed no longer clears the selection of objects.
• Fixed a crash after switching from a multi-tool printer to a printer with fewer material slots, when a filament other than the first one was selected (Material database).
• Improved security of plugin installation. The plugin ID is now validated before it is used as an install path, the plugin marketplace is locked to its origin, and the plugin ID and version of the downloaded bundle must match what was requested. Thanks to Leonardo Alfonso Maier for participating in our responsible disclosure program.
• Localization: updated the POT file and the list of files with translatable strings. Format strings are now marked as c++-format, so translators get warnings about broken placeholders. Community dictionaries were merged with the new POT.