Hyperboloid Pencil Holder

This is a pencil holder designed to look like the cooling tower of a nuclear power plant. At its narrowest, it is about 50 mm wide in the interior. The file labeled "Hyperboloid Pencil Holder 2" is a stronger, more robust version of "Hyperboloid Pencil Holder" (the original file). However, some may still find the original to be more aesthetically pleasing.