Can any style pen be engraved?

Generally, the answer is Yes!

The answer would be maybe or even no if the text or logo you want to engrave will not fit on the pen you have or will lose too many details when sized to fit on the pen.  The answer might also depend on the shape of the pen.  If there are extreme changes in barrel diameter the laser might not be able to accurately engrave it.  We've never had that happen so far, but there is always that first time.

Otherwise,  we can almost always work out a way to engrave your pen that will suit your needs.