Hi im having a lot of trouble with the merge vertices tool, it just seems to only work occasionally, i have the highlight border edges on thick so that i can see where there are unjoined vertices on the model, but for some reason cannot correct them. I have tried the polygons>cleanup command but this doesnt seem to have any effect either, i was wondering if anyone could possibly let me know why this is and let me know how to get around this because im finding it difficult to progress. thanks Bill