This is a model of a Sharpie brand magic marker (not endorsed by the manufacturer) that I needed for an upcoming project.

It is a fairly detailed model including even the "mold draft" size difference along the length of the tube.

The result is a snug fit when making models for actual Sharpie!

More about this on my projects blog, here:
https://theheadlesssourceman.wordpress.com/2018/05/09/sharpie-3d-model/

• A pen holder.
• Combine with other models (a pen cap in the shape of Donald Trump?)
• Create a mouthpiece so quadriplegics can hold a marker.

There is a .scad file for doing your own thing, or there are two .stl files. One of the actual marker, and one that is 0.2mm larger on all sides.

If you're planning to use this model to subtract from something to fit a marker (most likely). Then you probably want the 0.2mm oversized one.