Very tight print in place, but eventually got working. A few drops of PTFE 'super lube' and windmill spins nicely (even just with strong wind). However the two bits which go together to hold the front part on were WAY too tight, even after sanding. They broke so resorted to epoxy glue. Also the model is over-balanced so doesn't sit upright on its own. Overall good, but could do with some fettling to make it better.