"Export as .stl" scaling not applied on scaled object instances

[jhlchu]

Version

2.3.0

Operating system type + version

Win10x64

3D printer brand / version + firmware version (if known)

Prusa Mk3S + Latest FW

Behavior

• Describe the problem
  • When exporting as .stl, scaling of instanced objects no applied onto exported .stl
• Steps needed to reproduce the problem
  1. Add an .stl to the slicer.
  2. Change the scaling factor of object.
  3. Instance the object using right click context menu > "Set instance number". Enter any number > 1.
  4. Select any one (but not both) of the objects so that is becomes highlighted in green.
  5. Exported highlighted object using right click context menu > "Export as STL".
  6. Import the exported stl in another program (e.g. fusion).
  7. Imported stl object is not scaled to correct factor as shown in slicer.
• Expected Results
  • Exported object should have same scaling factor as applied in slicer. Object should export with parameters of highlighted object rather than root object.
• Actual Results
  • Exported stl has original scaling factor rather than the one applied.

Possible Cause

This behaviour seems to be specific to transformation applied on object instances. Exported stl is using transform parameters (in this case scaling factor) of the root object, rather than instance objects. Applying 300% scaling to object, then instancing it, all instance have correct 300% scaling but root object has original 100% scaling. Export as stl is using root object parameters to export rather in the highlighted instance object that users would expect to be exported.

Is this a new feature request? No

[supermerill]

fixed in 2.3.1 and 2.4.0 but it returned in 2.4.1 it seems.