Hello. I would likt to know how only using the flip along method… because I found only a paid plugin to mirror a object. How to manually mirror without using the scale mode?
Are you still using SketchUp 2020 as shown in your profile?
You can also scale to negative values.
Chose a middle handle perpendicular to the plane you want to mirror - think of it as pushing the object through itself - like turning a paper bag inside out.
Once you push it through type -1 and press enter.
It will snap to -1 too…