I got a new Elmo 16 CL projector last summer. I did a quick check before I ran any films, but I should have done a better one. I now realized it does indeed have gooey rollers. It wasn't obvious as the top of the rollers look good. The goo came from the center of the roller, got pressed out of the side and then hit the film at the sprocket holes.
So that put the projector to a quick halt. The good news is that new, almost unused, rollers are on its way from a good friend! It is now located at Keflavik, Iceland, for a short stop on its way. So I hope to get it up and running again soon.
This hobby truly is an emotional roller coaster :-)