Here is a great starter list of parts for your Wanhao Duplicator 4 and 4X printers that are 3D printable. These parts have been sourced from different sites and designers around the web. Downloading, installing, and/or using these parts is to be done by experienced users with the knowledge that you can potentially damage your machine if you are using a part or component not included with your original printer purchase. Use of these files may result in a voidance of your limited warranty with Wanhao USA. We are not responsible for damage or malfunction of your machine by downloading, installing, and/or using these parts. Enjoy!