QCAD supports a fixed set of lineweights. The lineweights available might seem somewhat arbitrary but are defined in the DXF/DWG standard. Custom lineweights in QCAD would break compatibility with any other DXF/DWG compatible CAD software.
However, if you are using QCAD Professional >= 3.11 (2015/10/06), there is a possibility to get around this limitation: custom segment widths for polylines. To make use of this feature, make sure that your entity is a polyline. Almost all entities can be easily converted to polylines, for example using Draw > Polyline > Create from Segments for lines or arcs or using Modify > Explode for splines or ellipses.
You can then use the property editor (View > Property Editor) to assign any custom lineweight to the whole polyline (global width) or to individual segments (start width, end width):
Tips and tricks you want to share with other users. Tutorials, user submitted documentation, etc.
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