Sourcing Guide

Steakholder 3D prints first edible fish: what it means for hardware sourcing

An Israeli food-tech company, Steakholder, 3D prints first edible fish using a grouper-cell bioink and a custom food printer. If you build machines like this, the printed fish is the easy part. The extruder head, heated cartridge, food-safe nozzle and gantry are machined parts, and they decide whether the print runs or jams. This guide gives engineers and buyers seven checks for sourcing those parts.

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Food-safe materials±0.005 mm toleranceNo MOQ12-hour DFM

CNC machining prototype parts for a Steakholder 3D prints first edible fish style food printer

On this page

1
Key takeaways
2
Seven checks when Steakholder 3D prints first take hardware to production
3
Start with the food-contact path, not the frame
4
Match tolerance to the feature, not to the drawing header
5
Confirm machine capacity before you send the file
6
Read lead time, order size and certificates together
7
Price the finish and the paperwork, not just the cut
8
Step by step: sourcing machined parts for a cultivated-fish printer

Quick answer

Key takeaways

The printer, not the fishCultivated fish printing is a hardware problem: print head, gantry, cartridge and plumbing.

Food contact drives material choice316L stainless and PEEK handle cleaning cycles; 6061 aluminium does not belong in the wet path.

Tolerance is a routing decision±0.005 mm suits nozzles and seal faces; brackets and frames run fine at ±0.05 mm.

Certificates are filters, not guaranteesISO 9001 and ISO 13485 tell you the process works, not that your part is right.

Quote speed reveals the shopA supplier that returns DFM notes in 12 hours usually has its process under control.

Selection table

Seven checks when Steakholder 3D prints first take hardware to production

Compare what matters at prototype stage against what matters at pilot production.

Check	Prototype stage	Pilot production
Tolerance	±0.05 mm is enough for brackets	±0.005 mm on nozzles and seal faces
Material	6061 aluminium for dry frames	316L stainless and PEEK for wet path
Order size	One piece, no minimum	10,000+ part runs with tooling plan
Lead time	Parts ship in 3–5 days	Scheduled releases over months
Inspection	Visual plus key dimensions	100% inspection with reports
Certification	ISO 9001:2015 baseline	ISO 13485:2016 for food and medical
Confidentiality	NDA on request	ISO 27001:2022 controls on files

Pick the supplier that answers the tolerance question first

If a shop quotes before asking which surfaces touch the bioink, keep looking. The right partner splits tolerance bands, names the alloy for the wet path and shows you the inspection plan.

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Check 1 and 2

Start with the food-contact path, not the frame

When Steakholder 3D prints first edible fish, the headline is the biology. The engineering question sits one layer down: which surfaces touch the bioink, the cleaning fluid and the steam cycle. Those surfaces decide the alloy, the finish and the inspection routine. Everything else is structure.

Build the wet path from 316L stainless. It resists chloride cleaning agents and hot water better than 304, and it welds and machines predictably at the small sizes a print head demands. PEEK covers the parts that must insulate heat or slide without lubrication, such as the cartridge sleeve and the plunger guide.

Keep 6061 aluminium out of the wet path. It machines faster and costs less, which makes it tempting for manifolds and adapters. Chloride cleaners pit the surface, and the pits become harborage points that no rinse cycle removes. Use aluminium for the gantry, the frame and the electronics enclosure instead.

Surface finish matters as much as alloy. A wet-path part at Ra 0.8–1.6 μm cleans well without extra cost. Going to Ra 0.2–0.8 μm makes sense on nozzle bores and seal faces, where a finer surface reduces adhesion and biofilm risk. Specifying that finish on a mounting bracket just adds cost.

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Wet path316L stainless, Ra 0.8–1.6 μm, no dead-end bores.
2
Dry structure6061-T6 aluminium, anodized if the shop floor is humid.
3
Insulation and wear partsPEEK or POM, depending on temperature at the cartridge.

Check 3

Match tolerance to the feature, not to the drawing header

A drawing that says ±0.005 mm everywhere is a cost problem, not a quality statement. On a food printer, the nozzle orifice, the seal face and the extrusion screw flight need that tolerance. The base plate, the cable bracket and the drip tray do not.

Ask the shop to quote two tolerance bands on the same drawing. On a typical print-head assembly, that split cuts machining time without touching the critical features. A supplier that pushes back and explains which features drive the tight band is worth keeping.

Inspection has to follow the same logic. Critical features get measured on a CMM and reported. Cosmetic and structural features get checked against the drawing with go and no-go gauges. That mix keeps the report readable and the price honest.

1
Tight band±0.005 mm (±0.0002 in) on nozzle, seal and metering features.
2
Open band±0.05 mm or wider on frames, covers and mounting plates.
3
ReportsAsk for dimensional reports on the tight band only.

Check 4

Confirm machine capacity before you send the file

Print heads are small, but the machines that make them are not always the constraint. The parts that surprise buyers are the long ones: a gantry rail, a conveyor frame or a cartridge housing that grew during the design review. A shop that tops out at 600 mm cannot quote those, no matter how good its five-axis work is.

Capacity also decides how many setups your part needs. A five-axis machine cuts a complex head housing in one setup, which holds the datum relationships between the nozzle bore and the mounting face. Three-axis work needs two or three setups, and each one adds stack-up error.

Ask for the work envelope in writing before you release the file. GreatLight runs 127 high-precision CNC machines, including 16 simultaneous 5-axis centers and a Ø400 mm rotary table, with a maximum processing size of 4,000 mm. That covers a full gantry rail or a palm-sized nozzle in the same shop.

1
Small parts500 × 500 × 450 mm and 500 × 310 × 200 mm travels.
2
Mid-size parts750 × 1,150 × 550 mm and 600 × 600 × 600 mm travels.
3
Long partsUp to 4,000 × 400 × 150 mm on the large travels.

Check 5 and 6

Read lead time, order size and certificates together

A food printer program rarely needs 10,000 parts on day one. It needs three heads to test, then thirty to place with pilot customers, then a production release. A supplier with a high minimum order quantity forces you to guess the final design too early.

No minimum order quantity changes the economics of iteration. You can order one machined nozzle, measure the flow, change the taper and order again the next week. GreatLight quotes and returns a free DFM analysis within 12 hours, and production can start within 24 hours once the drawing is frozen.

Certificates work as filters. ISO 9001:2015 says the quality system is audited. IATF 16949:2016 adds automotive discipline. ISO 13485:2016 covers medical devices, which is the closest framework to food-contact hardware. ISO 27001:2022 covers how your CAD files are stored. If your design is confidential, that last one matters more than buyers expect.

None of these certificates proves your part is right. They prove the shop can repeat a documented process and show you the records. Pair them with a first-article inspection on your own drawing.

1
IterationNo minimum order quantity, from one prototype to 10,000+ part runs.
2
SpeedQuote and DFM in 12 hours, parts ship in 3–5 days.
3
RecordsRaw material check, in-process monitoring, final inspection.

Check 7

Price the finish and the paperwork, not just the cut

Two quotes for the same nozzle can differ by 40 percent, and the gap is rarely the machining. It is the finish, the inspection and the paperwork. A bead-blasted, passivated, laser-marked part with a dimensional report costs more than a raw machined one, and both may be valid depending on where the part sits.

Laser marking needs a minimum character height of 1.5 mm to stay legible after cleaning cycles. If your part number has to survive steam, plan the marking area early. Etching a 0.8 mm character into a curved housing looks fine on the bench and disappears after twenty cycles.

Finishing options worth knowing: anodizing for aluminium frames, electroless nickel for wear surfaces, passivation for stainless wet-path parts, and bead blasting where grip or appearance matters. Ask which operations are in-house. Subcontracted finishing adds days and hides the process control.

1
StainlessPassivation after machining; specify if chloride cleaners are used.
2
AluminiumClear or hardcoat anodizing on frames and enclosures.
3
MarkingLaser engraving, minimum character height 1.5 mm.

Workflow

Step by step: sourcing machined parts for a cultivated-fish printer

1
Split the assembly by contactMark every part that touches bioink, cleaning fluid or steam. Those go to 316L stainless or PEEK; the rest stays aluminium or steel.
2
Set two tolerance bandsPut ±0.005 mm on nozzle bores, seal faces and metering features. Leave ±0.05 mm on brackets, covers and frames.
3
Check the work envelopeList the largest part in the assembly and confirm the shop can reach it. A 4,000 mm rail and a 20 mm nozzle may come from the same supplier.
4
Send files under NDAUpload STEP files with the tolerance bands marked. Request an NDA before release if the design is not public. Uploads stay secure and confidential.
5
Review the DFM notesExpect feedback within 12 hours. Look for comments on wall thickness, tool reach and datum choice, not just a price.
6
Order one piece firstMachine a single head housing and measure it. Adjust the taper or the seal groove before committing to a batch.
7
Lock inspection scopeAgree which features get CMM reports and which get gauge checks. 100% inspection before shipment is the default.
8
Plan the finishConfirm passivation, anodizing or plating before the first batch ships, so the second batch matches the first.

FAQs

Questions engineers ask after Steakholder 3D prints first edible fish

Can the same shop machine the print head and the gantry?

Usually yes, if the work envelope covers the longest part. GreatLight runs 127 machines across five-axis, four-axis, three-axis and mill-turn centers, with a maximum processing size of 4,000 mm.

Splitting the work between two suppliers means two sets of datums, two inspection reports and two delivery schedules. One shop keeps the assembly tolerances consistent.

Which stainless grade should the wet path use?

316L is the default for food-contact hardware. It handles chloride cleaning agents and repeated steam cycles better than 304, and it machines cleanly at small diameters.

Use 17-4PH where you need higher strength on a shaft or a plunger, then passivate it. Do not use 303 in the wet path; the sulfur addition improves machinability but hurts corrosion resistance.

How tight does a nozzle bore really need to be?

±0.005 mm is realistic for a machined nozzle bore and keeps flow variation low across a batch. Going tighter adds cost fast and rarely changes print quality.

Pair the bore tolerance with a surface finish of Ra 0.2–0.8 μm. A tight bore with a rough wall still traps material and clogs.

What does a supplier need to quote a food printer part?

A STEP or native CAD file, the material, the tolerance bands per feature, the finish, and the quantity. Mark the food-contact surfaces on the drawing.

With those inputs, a quote and DFM analysis come back within 12 hours. Production can start within 24 hours after the drawing is frozen.

Is there a minimum order quantity for prototype heads?

No. Orders run from one prototype to 10,000+ part runs, so you can iterate on a single housing without paying for tooling.

For small batches, expect parts to ship in 3–5 days. Historical late-delivery probability is below 2 percent.

How are confidential food-tech designs handled?

Uploads are secure and confidential, and an NDA is available on request before files are released.

ISO 27001:2022 covers the information security management system behind that promise, which matters when the design is not yet patented.

Send your print-head drawing and get DFM notes in 12 hours

Upload STEP files, mark the food-contact surfaces, and we return a quote with manufacturability notes. No minimum order quantity, 100% inspection before shipment.

12-hour quote100% inspectionNo MOQNDA on request

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