A practical small sized fusor is a fantasy at this point. The only reaction that stands any chance to break even is the Deuterium-Tritium fusion, which generates one neutron for each tritium atom fused. Since tritium is not found in nature and has a 12 years half life, it needs to be produced by capturing the free neutron. The classic proposal is to line the reactor with a thick blanket of molten or ceramic lithium that will breed a tritium atom for each captured neutron.

This whole design is purely speculative, there is no practical instance of this process at industrial scale and there are significant doubts tritium self-sufficiency is even attainable -the neutron capture and tritium recovery efficiency must be close to 100% or you need a large ratio of neutron multiplication that brings its own problems of nuclear waste and contamination. Tritium is a particularly hazard with the nasty habit of replacing hidrogen in living tissue, seeping out of the tinniest pores and embrittling the reactor vessel and ducts.

Assuming all these problems are solved (which are themselves already researched for decades and worthy of 100s of patents), you will still end-up with a factory sized tritium production facility, not something container sized. BTW, did I mention tritium is the key ingredient for moving from clasic fission nukes to thermonuclear weapons? (never mention the classic proliferation appeal of any environment with plenty of neutrons)

And this is just one subsistem, one problem to solve out of a vast number. But hey, they've got a patent.