A New Type of 3D Printed Pasta and What It Says About Printing

Barilla released a new type 3d printed spaghetti format through its BluRhapsody line, a service that already produced short pasta shapes on demand. The spaghetti variant is extruded from the same durum semolina and water dough used for conventional dry pasta, not from a plastic or a resin. That detail matters: the material is food, and the machine is a printer.

The geometry is the point. A round strand at a fixed diameter looks trivial, but a fresh pasta dough at 30–35% moisture is soft, sticky, and prone to slumping. Holding a Ø1.6 mm cross-section over a long run is where the engineering sits. Any printed strand has to survive its own weight before it dries.

Barilla does not publish nozzle sizes, print speeds, or dryer profiles, so we should not invent them. What is public is the input: semolina flour, water, and a paste that behaves like a non-Newtonian fluid. That is the same class of material many paste-extrusion and ceramic printers handle.

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  MaterialDurum semolina and water dough, the same input as dry pasta
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  ProcessPaste extrusion through a nozzle, then drying
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  Hard partKeeping strand diameter and roundness stable before the dough sets
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  Not the sameThis is food printing, not FDM filament or metal powder

Paste extrusion shares physics with FDM and with direct ink writing. A pump or screw pushes material through a small orifice, and the extrudate swells slightly as it leaves the nozzle. Die swell, wall slip, and yield stress decide whether the strand comes out round or oval, straight or wavy.

Food dough adds two complications. It is abrasive enough to wear brass nozzles over long runs, and it is temperature sensitive. Warmer dough flows better but sags faster. Cooler dough holds shape but raises back pressure and can stall a small extruder. Printers for this work usually control the barrel temperature within a few degrees.

Then comes drying. A strand printed at 30–35% moisture loses most of that water in the dryer, and it shrinks as it does. Shrinkage is not uniform: a thick section dries slower than a thin one, so a shape with mixed wall thickness can bow or crack. That is the same distortion problem injection molders and machinists fight, just at a slower clock.

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  Die swellExtrudate expands after leaving the nozzle; compensate in the toolpath
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  Yield stressBelow it the paste will not flow; above it the strand sags
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  Drying shrinkThick sections dry slower and pull the part out of shape
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  Nozzle wearAbrasive dough erodes brass; steel or coated nozzles last longer

When a customer brings a printed concept part to us, the first question is what the part has to do. Printing wins when the geometry is internal, lattice-like, or impossible to reach with a cutter. It also wins when the part is one of a handful and the design is still moving. Changing a print file costs nothing but time.

Machining wins when the part carries load, seals against another surface, or has to hold a tolerance across a batch. A printed polymer part typically lands in the ±0.1 to ±0.3 mm range and varies with orientation and moisture. On our 5-axis centers we hold ±0.005 mm (±0.0002 in) on metals, with surface finish down to Ra 0.2–0.8 μm when the drawing calls for it.

There is also a material argument. Printing gives you a limited shelf of resins and filaments. Machining gives you 6061-T6, 7075, 17-4PH, Ti-6Al-4V, PEEK, and more, each with published mechanical data. If the part has to pass a fatigue or pressure test, that data matters more than the shape freedom.

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  Choose printingComplex internal channels, low volume, design still changing
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  Choose machiningTight tolerance, load bearing, sealing faces, known material data
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  Hybrid routePrint close to shape, then machine the critical interfaces
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  Watch outPrinted threads and bearing bores rarely hold spec without rework

The pasta case is a reminder that printing is not only for prototypes. Barilla prints on demand because holding inventory of dozens of shapes is expensive, and a digital file costs nothing to store. The same logic applies to spare parts, custom jigs, and low-run brackets. Tooling amortization disappears.

In our shop, printing handles form and fit checks before a metal run, plus end-use parts like covers, ducts, and cable guides where loads are light. We keep it in-house so a design change does not restart the clock with an outside vendor. Printed fixtures also show up on the floor, holding parts for a first op.

Where we push back is on anything safety related. A printed hinge on a machine guard, a printed pressure-fitting thread, or a printed load path in a lifting device is a bad trade. Print the mock-up, machine the working part. That split keeps the schedule short and the risk low.

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  Good fitCovers, ducts, brackets, jigs, fit-check models
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  Good fitOn-demand spares where inventory cost beats unit cost
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  Poor fitPressure boundaries, fatigue parts, threads under load
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  Rule of thumbIf failure is dangerous, use a known wrought material