3D Print Tolerancing

The tolerancing of the part is controlled by the TOLERANCE_OFFSET variable in the CAD model.

Desired Fit	Clearance Gap (mm)	Multiplier
Press Fit	Line to line (0)	0 x
Tight Fit	0.1	1 x
Normal Fit	0.2	2 x
Loss Fit	0.3	3 x

Press Fit

Tight Fit

This is commonly used in bearing interfaces

Normal Fit

Reference

Best practices for fits and tolerances and 3D-printing - FreeCAD Forumforum.freecad.org

3D Printing Tolerances: How to Test & Improve ThemAll3DP

3D Printing Tolerances & Fits3DChimera