I was able to create a small titanium sublimation vacuum pump using a few simple components.
This pump is part of my larger vacuum chamber system. I had previously shown a simple vacuum setup in several other projects: https://hackaday.io/project/188141-sputtering-magnetron and https://hackaday.io/project/186063-my-little-scanning-electron-microscope .
Most of my vacuum table uses kf-25 sizes.

This pump consists of a short ~20mm coiled 26 gauge titanium filament wire supported by 2 copper wires.. These wires are pushed through a 1" silicone stopper.
The semi-conical silicone stopper is fitted tightly into a KF-25 100mm flange and clamped with a sealing ring.

A benchtop power supply is used to generate ~12V 5A of power. A separate transformaer power supply may be used later to supply thicker filaments at higher currents.