Upload your 3D CAD files in STL, STEP,IGES or SLDPRT format * If you have multiple files, please place them into one folder and compress the folder Please put all files into one folder and compress the folder into a ZIP or RAP file before uploading(Max 10MB). into a ZIP or RAR file. Please keep files smaller than 10MB. If attachment over 10MB, please send it to Email: kevin@huatengzhenye.com directly.