I really love this Bowden Clamp for my ultimaker that owen put together. But every time I printed it with Cura (love it) i got the problem of thin walls on the corners where the screws would go through. So this morning I just tweaked it, so the outside line is about 1mm further out,which you dont notice when you mount it on your print head version 1 or 2 ultimaker and then cura prints it really nice and solid. also i cut away a little fat, that wasnt needed. Enjoy. Ian