I've always just copied and pasted sections from my actual script into a new document and printed those off. Sometimes I don't give the actor sides and have them improv things I want to see in the character. Do whatever works for you and your story.
With Celtx one can produce just an actor's dialog pages. I'm sure that the commercial scriptwriting products have something similar.
If you are not using a free scriptwriting package such as Celtx, or similar, or using a pro product, I'd suggest you find one that fits your needs/budget.
There are some people who have used Trelby but there have been issues, and I don't know the current state of things.
I've been using off and on, a scripting 'language' called Fountain. This allows one to use any simple editor, and a Fountain processor, such as Highland generate PDFs or Final Draft XML files for output.
o/t. One time shooting an embargoed political TV spot by the harbour here, one a series of 60sec spots, a script assistant running late,
for some unknown reason, bought along the whole series of scripts, fresh off the printer and uncollated.
She had them in a basket and as she was getting out of her car, she took a header and all the pages flew out. The wind got 'em
and the horrified client rep and crew watched their secret project flying up over the Opera House.
Worse, it got in the weekend newspapers with caustic comments by the opposition.
Be careful what you let out.