@westy49 said: Am surprised that Curviloft is so expensive. It is £55 a year. This is about one-ninth of the cost of buying an open license for SketchUp Pro 18. I would not mind buying a one-off open license but there is no guarantee that I will use the plug-in very much so I am reluctant to pay so much for just one year's use. Can someone design a more cost-effective plug-in to do the same job? Where did you find Curviloft for £55 a year? Here on Sketchucation it's available at no charge. No need to have someone reinvent the wheel.