New technologies
Powder or Plate
The garages stay. What's in them changes.
Two articles ago this magazine said a thousand garages could print the panels for a barrel big enough to spin. One article ago it admitted the problem with that: a sintered stainless part is not wrought stainless. It is more porous, it is weaker, and it is worse under the kind of repeated load a pressure hull sees every time the sun comes around. We proposed fixing that at the yard, with a furnace and hot isostatic pressing and shot peening. That still works. But there is a simpler way to get a part with known properties, and it is the way every machine shop in the country has been doing it for a hundred years. Start with metal that is already good, and cut away what you don't need.
Certify it once
Here is the supply chain. A mill makes the plate. It tests the plate, the way plate is always tested: chemistry, tensile, hardness, a heat number stamped on every piece. A second operation cuts that plate into blanks, one blank per panel, a little oversize, and ships them out with the certification riding along. The garages never touch metallurgy. They receive a blank whose properties are a matter of record, they machine it to the file, and they send the finished panel back. At the dock, every panel goes through a gauge. Anything out of tolerance goes back to the melt. Anything in tolerance gets its heat number logged against the machine that cut it and the day it was cut, and goes into a cartridge.
That is not a new idea. It is how a wing spar is made. The only thing new is that the spindles are in ten thousand garages instead of one building.
Notice what the blank does for control. You cannot make a panel without one. The yard knows exactly how many blanks exist, where each one went, and whether it came back. A panel that fails in orbit ten years from now traces to a lot, a machine, and an afternoon. A printed part can't give you that, because the material was made in the garage, on the day, and nobody was watching.
The machine problem
There is one honest objection, and it's the reason the first article said print instead of cut. The machines in garages today don't cut stainless.
They will, in the sense that chips come off. A router on a gantry, the two-thousand-dollar kind, lacks the rigidity and the spindle torque to take a real cut in 316. You take a shaving instead. And 316 stainless punishes shaving; it work-hardens the instant a tool rubs instead of cuts, and then the next pass is cutting something harder than the tool was meant for.1 You'd spend a day per panel and burn through end mills doing it.
The next tier up does the job. A benchtop mill with real linear rails and a real spindle cuts stainless in production every day, in one-man job shops all over the country. But that tier starts around ten thousand dollars and runs to forty, plus coolant, fixturing, and someone who knows feeds and speeds.2 That is a job shop, not a garage.
As this was being written, a Shenzhen startup called InfiMaker was two weeks from closing a Kickstarter for exactly the machine that gap implies: a desktop five-axis mill at about five thousand dollars that lists stainless and titanium on its material sheet.3 It hasn't shipped, so treat it as a signal, not a proof. But read the fine print and you find that a desktop machine of that weight gets its finish by taking very light cuts,4 and the five-axis work envelope is under five inches on a side. So it touches stainless, and it can't hold our panel. It's a very good general-purpose machine, and general-purpose is the problem.
So there is a gap. Nothing sits between the machine that can't do it and the machine that costs as much as a truck. That gap is the article.
One triangle, forever
A general-purpose mill is expensive because it has to do everything: any part, any material, any size that fits the table. Ours doesn't. It cuts one triangle, from one blank, of one alloy, to one file, and it does that ten thousand times.
And a word about that triangle. Ten inches was never a structural decision. We picked it because that is the bed size on the most affordable printer a person could put in a garage, and the whole point was that the work had to be doable in garages all over the country. The panel was sized to the machine we thought people already had. If the right machine turns out to want a bigger panel, the panel gets bigger. Nothing in the lock, the stagger, or the keystone cares what the number is. What we can't compromise on is the other half of it: whatever the machine is, it has to be something we can mass produce and put, evenly, into ten thousand garages. Find that machine and the size follows it. That is the order the problem actually runs in.
That changes the design. The work envelope shrinks to the panel, and stiffness climbs fast as a machine gets smaller: a short beam bends far less than a long one under the same load. The fixture is not a vise; it is a nest cut to the blank, so the part locates itself and the operator's only job is drop it in and close the clamp. The spindle runs one speed, the program is one program, and the controller has one button.
The frame is where the money should go. Cast iron, or a granite-epoxy pour, damps chatter better than any bolted-up aluminum extrusion. The linear rails and ballscrews are commodity parts, and the best of them come from Taiwan; buy those. Spindles and drives, mostly Asia; buy those too. Strip out every axis, every tool changer, every inch of travel the triangle doesn't need, and the price falls toward what the frame costs. That is how you get under five thousand dollars. And the "stick to it" part matters as much as the price: sell it at cost or lease it, and let the yard make its money on panels, not machines.
Where it gets built
Realistically, nobody builds a machine like this start to finish in one place. You buy the guts from whoever makes them best and you make the part that decides whether it cuts: the frame. Cast iron gets poured in foundries all over the Midwest and the South, and a granite-epoxy base can be poured damn near anywhere. Assembly and alignment belong in the machine-tool belt, Ohio, Michigan, Indiana, Wisconsin, Rockford, where the supplier density is and, more importantly, where the people are who already know how to scrape a way and align a spindle. Haas proves it can be done in California. It can be done in Cleveland too.
Who we need to hear from
So the correction stands. The printer was the romantic answer, and the metallurgy broke it. Cutting from certified plate fixes the porosity, the strength, the fatigue, and the traceability in one move, and the thousand garages survive it. You're not abandoning them. You're changing what's on the bench.
But the machine that belongs on that bench doesn't exist yet, and that is where this magazine needs help.
So let's be plain about it. Here is a need. Somebody has to build a small, stiff, single-purpose machine that cuts one panel out of certified plate, sells for a price a person can justify in a garage, and can be manufactured in the thousands and distributed evenly across the country. That is the whole specification. It isn't a hard machine. It's a machine nobody has had a reason to build until now.
We want to hear from anybody who touches that problem. Machine tool builders first: you know what it costs to make a frame stiff, and whether five thousand dollars is a real number or a wish. Foundries who can pour a base. Job shops who cut 316 all day and know what feeds and speeds this would actually run at. Tooling people. Control and firmware people. Investors, if this is a product rather than a project. And the mills, because none of it works without certified plate cut to blanks and shipped with the paper.
And if you think the whole approach is wrong, we want to hear that too. We've already corrected this magazine twice in public and we'll do it again. We're not attached to the answer. We're attached to getting the panel made.
Who do we have to talk to? Tell us. Write to hello@starboundmagazine.com.
From one explorer to another, we appreciate you reading this far. We are excited about what this endeavor brings, and we would like you along for the rest of it.
Come join us. Because we are Star Bound.
John LangEditor
Ideas in Star Bound are published open — take them, build them better. Our open proposal.
A note on where this comes from. I am not a metallurgist, a spacecraft engineer, or a degreed engineer of any kind. But I am a practical one, with more than forty years in heavy industrial construction: welding, millwright work, hydraulics, mining, and thirty-three years of electrical construction and commissioning on the North Slope of Alaska, in a place that punishes anything built wrong. Much of that time I have worked as a field engineer, which means I am the one standing in front of the equipment when the drawing turns out to be wrong, and the fix has to be made on the spot, with what is on hand, and has to work the first time. Anyone who has done that long enough learns that a lot of engineering gets corrected in the field by people with more experience than the people who drew it. That is the eye I bring to these subjects: not what should work on paper, but what actually gets built, and what breaks. The facts I take from other people are footnoted so you can check them and read further. The ideas built on top of those facts are my own, and I would rather see them knocked down by somebody who knows better than left standing because nobody looked.
Sources
- Austenitic stainless work-hardens under a rubbing tool, which is why light passes on a lightweight machine make the next pass harder; a desktop mill gets acceptable finish only by taking very light cuts. Cameron Coward, My Experience at the InfiMaker K1 Five-Axis CNC Launch Event, Hackster.io, September 2026. ↩
- Price band for a production-capable benchtop mill versus a hobby gantry router: editor's own market survey, September 2026, across the Tormach and Haas Mini Mill class and the desktop router class (Shapeoko, X-Carve, Genmitsu). Treat the ten-to-forty-thousand range as a bracket, not a quote. ↩
- InfiMaker K1: enclosed desktop simultaneous five-axis mill, 1,500 W / 20,000 rpm spindle, about 110 kg; Kickstarter pledges from $5,199, campaign opened August 11 and closes September 26, 2026, delivery estimated December 2026. 3DPCC, InfiMaker Launches K1 Desktop Five-Axis CNC on Kickstarter; campaign page, InfiMaker K1: The Pro-Grade Desktop 5-Axis CNC. ↩
- Five-axis work envelope of roughly 120 mm on a side, compared against the Pocket NC V2 and Xhorse3D WM-100. TechnicalTrendy, InfiMaker K1 Kickstarter: Desktop 5-Axis CNC with AI CAM, August 2026. ↩
This follows A Thousand Garages and Cold, Vacuum, and a Hundred Thousand Joints, and it is the second time this magazine has corrected the first of those in public. The blank-and-machine supply chain, the single-purpose machine, and the argument that the panel size follows the machine rather than the other way round are my own proposals. I am not a machine tool designer. The ten-to-forty-thousand-dollar bracket is a working engineer's estimate from shopping the market, not a quotation, and anyone who builds machine tools for a living and can show that the five-thousand-dollar figure is a wish rather than a number is exactly who this article is asking to write in.
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