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FreeCAD
Tips
To fuse solids together it is better to have overlapping solids.
Dependency Graph
A useful tool to inspect how many solids compose a single document.
GraphViz
The dependency graph depends on the GraphViz library.
On major linux distribs you can simply install graphviz from the repos :
$ sudo apt install graphviz
If FreeCAD signals that it cannot find the GraphViz package when you are sure it is installed, you can correct this by pointing it to /usr/bin/ with the appropriate dialog box.
Functions
Groove
| Create a shape to be grooved (Sketch + Pad) |  |
| Create another sketch along the correct axis and create a closed shape to mark the groove |  |
| Select the first shape and the sketch and apply a groove along the corresponding axis (here Z) |  |