Our 3D CAD supplier models have been moved to 3Dfindit.com, the new visual search engine for 3D CAD, CAE & BIM models.
You can log in there with your existing account of this site.
The content remains free of charge.
By circling around a Rotation axis (x-axis), the 2D contour becomes a solid.
Right-click on the x-axis.
From the context menu, select Attributes -> Rotation axis. --> The x-axis is now shown as a dotted line.