Sometimes it could happen in the 3DPRN-WARE environment that an error is generated when you go to import a 3D file of the DWG or DXF type.
To solve the problem, just go to the download area of this site and download the VCREDIST component: you have to choose between 32 bit e 64 bit depending on the architecture of the operating system currently installed on your PC. Once the component has been installed, just restart the 3DPRN-WARE software.