Reply To: Chillul Shabbos?

Is the siddur itself muktzah after its final use?

Doubtful, since someone could use it if they wanted to.

Placing it for maariv would seem to be hachanah,

So, by doing so, for years, I have been mechalel Shabbos every time I davened for the amud on Shabbos mincha.

The Wolf