I’m not able to build a Moebius Strip. Who could help me?
Can you share the SKP file that you are trying to print?
https://3dwarehouse.sketchup.com/search.html?backendClass=both&q=moebius%20strip&backendClass=both
Returns many examples.
However, for 3d-printing you need a ‘solid’, and by definition a Moebius strip needs its back-side to morph into into its front-face, and it’s a single 2d face twisted.
Adding the 3d form to make a true solid is your challenge…
There are tools to extrude a surface into 3d - like Fredo’s JointPushPull - but at some point the 3d ‘extrusion’ will not join up in 3d…
It is fixable, but needs considerable effort…
You can use Spirix to rotate any outline 180 degrees while revolving 360 degrees around the z-axis. Here’s a simple example:

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