Primary good that can be presnetly produced via Ponoko: a bat box. Sounds simple, admittedly, but it’s well suited to the current production capabilities of Ponoko. Additionally, this qualifies as a “primary good” precisely because, by housing bats in one’s yard, it’s possible to 1) control insect populations, and 2) accumulate valuable fertilizer from the bats for use in localized food production. Bee hives and relate systems are another good example, though the need for wire mesh is slightly beyond the current Ponoko capabilities. Another: cold frames. Worm farm. The list goes on.
Primary good that can be produced via Ponoko with modifications to its capabilities: A hand pump. This would probably require the ability to work with metal, in both sheet and tube form. I recognize that this is well beyond the current capability of Ponoko, but it’s not theoretically that big of a change. Also, if you added the ability to work with sheet metal and pipes/tubing, the universe of potential “primary” goods would open quite quickly (e.g. solar water heaters, stoves, etc.).