Yes, I have projectors for MF slides.

One system is for separately mounted images in GePe mounts – but the glassed mounts are really expensive if you have many slides…

The second projector takes either classic 6 x 13cm slides or the Spicer card mounts (which is how I mount most of my MF slides).

Both work well, but unless you have a very large screen (ten feet high and above) there’s little advantage over projected 35mm slides unless you go right up to the screen. For a normally placed audience, the resolution provided by the 35mm slides is as much as eyes can resolve from that distance so there’s  no point in using larger film in terms of detail.

However, a medium format slide will look a little “smoother” because any gradual changes in the scene will have more film grains available for the graduation…

So, unless you have a huge screen, and the space to use it, it’s hard to justify the effort involved.

Bob Aldridge