I don’t think many people are still printing presentations in 2019. The one exception: bankers pitching to institutional investors. The latter still like to flip along (or ahead) with the presentation and make notes in the margin.
Still, I want SlideMagic 2.0 to be fully rounded app, so I start the work on its print function. Printing is often ignored by many application development frameworks. The feature is not that important, it is tricky to develop and get right, but it has to be done.
A positive side effect is that I am coming up with a better way to convert presentations to PDF without the need to rely on open source libraries, and I can soon support conversions as a parallel process that no longer will block the main application process (something that can be annoying especially if you used large images).
(Beta testers can get around the current lack of the print feature by converting to PowerPoint or PDF and then print in those apps).