3d Builder Windows 11 |link| -

You can orient models, add automatic or custom supports, and scale to fit your printer’s bed.

: Easily merge multiple shapes or use one object to "carve" a hole out of another for custom functional parts. Interface & Design Examples How to use 3D Builder app in Windows 11/10 The Windows Club

"The object is not manifold. Would you like to repair it?"

Once installed, it runs natively on Windows 11 (both x64 and ARM devices usually handle it fine).

: Requires Windows 10 version 15063.0 or higher (which includes all Windows 11 builds). Alternatives for Windows 11 Users