In most cases Corel formats, including .des files (technical illustrations) can be only opened or exported to other formats in Corel software, in most cases CorelDraw Graphics Suite. So if you hope to print .des files to PDF format, you have to use Corel software.
Convert Corel Designer technical illustration to Adobe Portable document format.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert des to pdf on Windows
A set of applications used by professional graphic designers
Convert from des file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.