Thanks Kristof and Gumalca. Those are all useful comments. I agree with you about giving away small models. Only a couple of mine were premium until recently, but I thought I'd see what happens if I take the ones that were getting downloads and put a eur1 price tag on them. As expected, no more downloads. The Marble Maze has sold once and I think that traffic came from tweeting about it at JKBrickworks (who designed the original maze set on which it is based). I also shared it on Eurobricks and Reddit. I can see in the MOC analytics that all those things helped, and to some degree the increase in traffic seems to be holding, which is nice.