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Your first part

This makes a plate 40 mm by 20 mm and 5 mm thick, with a 6 mm hole, and exports it for your slicer.

Sketch. Click New Document, press S and click the XY plane, which lies flat on the floor. Press R and click two opposite corners.

A rough rectangle drawn on the sketch plane

Size it. Press D, click the bottom edge, type 40 and press Enter. Click a side edge and type 20. Press C to draw a circle inside, then D and type 6 for its diameter.

Make it solid. Press E, click inside the rectangle but outside the circle, and drag the arrow up or type 5 and press Enter.

The extrude arrow with the plate previewed

Change your mind. Click the Extrude step in the History and change 5 to 8. The plate follows. Press F, click an edge and type a radius to round it.

Save and export. Ctrl+S saves a .funda file that keeps the whole history. Ctrl+E opens the Export window, where STL with Millimeter and Medium suits most slicers.