EXPOSED
The core of this job — reading engineering drawings and turning metal or plastic stock into a working prototype on lathes, mills, grinders, and by hand fitting — is physical work in a shop that no current robot does end-to-end. The real pressure isn't LLMs, it's CAD/CAM and additive manufacturing: parts that once required a skilled model maker's hands are now printed or cut from a solid model, and design iteration happens in software before anything is made. There is no license, no signature requirement, and the buyer is an internal engineering team rather than a client paying for a relationship, so the moats are almost entirely craft and embodiment.
Mixed — a routine tier and a judgment tier. Setting up a Bridgeport, indicating stock to a thou, hand-scraping a mating surface and dressing a scale model's compound curves still needs a person at the machine — but a large slice of your old work (making a one-off housing, a proof-of-concept bracket, a foundry pattern) now leaves the shop as an STL file to a printer or a 5-axis CNC, which is why this sits at 13 and not 17.
Hands-on in uncontrolled environments. You work standing at lathes, mills, surface grinders and sanders with chips, coolant, solvents and 3D-printer resins around you, fitting and reworking parts by feel on stock that never arrives twice the same — the only thing keeping it off the top of the band is that the shop is climate-controlled and you aren't crawling through a plant or up a structure.
No licence, no signature requirement. No state licence, no stamp, no certification gates model-making work; the engineer who signed the drawing owns the design and the QC inspector signs off the part, so nothing legally requires a specific credentialed human to have made it.
Some relationship component. Engineering and design teams come back to the model maker who reads intent past the drawing and says 'that wall won't hold at .020' before the part is cut, and that standing is real inside one company — but the work is bought as a part on a job number, transfers to whoever else can hold tolerance, and no outside customer knows your name.
Meaningful discretion. You choose fixturing, machining sequence, stock allowance and where to deviate from a drawing that can't actually be built, and a wrong call scraps expensive material or sends a flawed prototype into testing — but a designer or engineer reviews the result and the stakes are schedule and cost, not safety, which caps this below the top band.
Has AI actually changed your work?