If you wanted to print a slide optically, there are alternatives. Just thinking about some of the things that used to be done before digital became prominent.
You could project your slide onto panchromatic sheet film, for example. Or use a slide duplicator and photograph the slide with b&w film. Or use a macro lens and photograph the slide when it's back-lit, using b&w film.
I also agree with what Blansky said - chalk it up to learning experience.