The Sentro 40/48 yarn guide is made of plastic and can easily break. If you order from China, it will take over a month to receive it and the shipping is expensive. The Knitting Enthusiast is in the USA and we ship within 24 hours of receiving your order. Our yarn guide is not a 3D printer created product. It is the original part from the manufacturer. It comes with the screw to fasten it to your machine.