You should be able to save BLEND graphics files to 3DS format using Blender program.
Convert Blender 3D data file to 3ds Max (3D Studio MAX) graphics.
We found 4 software records in the database related to .blend to .3ds file format conversion.
Microsoft Windows software - convert blend to 3ds on Windows
A very popular free program used for work with 3D graphics
Convert from blend file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned blend to 3ds. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert blend to 3ds on OS X
The Mac version of popular free 3D graphics software
Linux/Unix software - convert blend to 3ds on Linux
Easy-to-use 3D modeling utility
On-line services software - convert blend to 3ds on web
A free online 3D model conversion service