Pen holder made to scale for, especially, a Targa 1003 v1, maybe some other Targa models will work as long as the diameter is still very similar to a Targa's.
There is a very small notch towards the back, this is for scaling, it represents 1cm. I didn't make the scale correct in blender so just scale it.
Should work with no supports, but you can use them to be safe.
Version pictured is outdated, changes have been made after observing initial results, mainly that it used to lack rolling supports, which are essential due to a high CofG.
The author marked this model as their own original creation. Imported from Thingiverse.