If printer isn't found he prints at default printer

hi guys

i've been looking around but didn't found anything.

At work the excel is been used by different people, but executed by 1. I wanted to make a button so that everyone just had to press the button and the correct printer starts.
first I was strugling with te Ne ports but since that is fixed i have a new problem. if the printer isn't installed yet at their pc it just prints at their default. i'd like to have some kind of security that it stops the macro and shows a MsgBox.
anyone that could help?

this is what i have.

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