The US market research company Gartner is expecting sales of 3D printers to double every year up to 2019. According to a press release by Swedish retailer Clas Ohlson, Gartner predicts that around 500 000 3D printers will be sold worldwide this year. This is because such products for private use are becoming better and cheaper. Clas Ohlson aims therefore to expand its range in this category.