It's Robber Rex from zheng3 remixed to be a pencil topper! Fits regular No. 2 pencils. That's it!
Supports are required for Rex's right toe. The hole itself prints fine without supports.
Supports are easily removed with needle-nosed pliers.
Supports needed for right toe
I took zheng's Robber Rex design and remixed it with Tinkercad to insert a cylindrical void into the existing model. I printed a few variations of hole width until I dialed in the diameter. Here, hole width is 8.1mm.