Electric Concept Car 3D Printing: What the Renault Filante Record 2025 Actually Shows

• 1
  Why electric concept car 3D printing shapes the Filante Record 2025
• 2
  How Scalmalloy and laser powder bed fusion behave in practice
• 3
  Cable-actuated controls and the parts that hold them
• 4
  Cell-to-pack design and what it means for printed brackets
• 5
  Where printing stops making sense and CNC takes over
• 6
  Printed versus machined parts on an electric concept car

The Filante Record 2025 is a demonstration car, not a production model. Renault built it to test how far energy efficiency can be pushed when mass, drag and mechanical losses are all attacked at once. The published figure is a 1,000 kg vehicle, which for an EV with a battery pack is very light. Every subsystem had to justify its own weight.

That constraint is what drives the printing. A steering wheel structure that would normally be a welded steel or cast aluminium assembly can instead be grown as one lattice part. The material Renault names is Scalmalloy, a scandium-aluminium-magnesium alloy developed for laser powder bed fusion. Scandium refines the grain structure during solidification, so the finished part reaches strengths closer to wrought 7075 than to a cast aluminium grade.

Printing also removes joints. Every bolted flange, weld and bracket is mass plus a stress riser plus an inspection point. A printed wheel hub with an integrated rim interface has none of those. In an electric concept car, 3D printing is therefore not a styling trick. It is a way to trade assembly count for design freedom.

The catch is anisotropy. A printed part is stronger along the build layers than across them. Any engineer specifying printed load paths has to know which direction the loads travel and orient the part accordingly. Get that wrong and the part fails at a fraction of its datasheet strength.

Laser powder bed fusion melts a thin layer of metal powder, typically 30–60 μm, then recoats and repeats. Layer thickness sets both surface finish and build time. A 30 μm layer gives a smoother surface but takes roughly twice as long as a 60 μm layer for the same height. For a steering wheel structure, that trade is usually worth taking at the grip surfaces and not worth taking in the hidden web.

Scalmalloy in the as-built condition is hard and tends to crack if you try to machine or bend it. Most production routes therefore include a heat treatment before any finishing cut. After aging, the alloy is machinable and can be tapped, reamed or faced without tearing. If a supplier skips that step, expect scrapped threads.

Support structures are the hidden cost. Downward-facing surfaces above roughly 45° from horizontal need support, and that support must be cut off by hand or on a CNC. Internal channels that cannot be reached by a cutter should stay simple. Curved cooling or cable routes are fine. Blind internal pockets are not.

Porosity is the other limit. Gas-entrapped pores of 50–200 μm are normal in as-built metal, and they matter on any sealing face or fatigue-critical section. Hip treatment reduces them, but it changes the cost structure entirely.

The Filante Record 2025 uses a cable-based system for acceleration and braking rather than a steering column full of mechanical linkages. That deletes a lot of mass: no intermediate shafts, fewer bearings, fewer brackets. It also moves the precision requirement from the linkage to the cable terminations and the pivot points.

Those small parts are where machining still earns its place. A cable anchor needs a clean bore, a defined radius and a repeatable crimp seat. Printed anchors can work, but the bore usually needs reaming afterwards, and printed threads in a 5 mm anchor are a poor idea. Turning the anchor from 7075 or 17-4PH stainless costs little and removes an entire failure mode.

The same split shows up on the steering wheel itself. The printed structure carries bending and torsion. The grip interface, the bearing seats and the fastener threads are better as machined inserts bonded or bolted into the printed body. That hybrid approach is common on concept vehicles because it keeps the printed geometry where it adds value.

Note the inspection implication. A printed lattice cannot be measured the way a machined boss can. You inspect the machined interfaces to ±0.005 mm and you qualify the printed structure by coupon tests and CT scans from the same build. Both are needed.

Renault integrated the battery directly into the vehicle without intermediate modules. Cell-to-pack designs remove module housings, busbars and a layer of fasteners, which is where a large share of pack mass usually sits. What remains is a structural enclosure that has to carry crash loads and keep the cells in compression.

Printed brackets are a good fit around the edges of that enclosure. They let you follow the body contour exactly, add stiffness only where the load path runs, and consolidate several small steel brackets into one part. On a low-volume build, that saves tooling cost as well as weight.

They are a poor fit for the main crash structure. Large printed sections have direction-dependent properties, and crash simulation is not yet reliable enough for a printed primary load path on a road car. Renault is testing on a demonstration vehicle. That is a meaningful distinction for anyone reading the press release as a production roadmap.

The practical rule for brackets: print them when the load path is short, the geometry is organic and the annual volume is low. Machine them when the load path is long, the interface is bolted and the part number will run for years.

Printing wins on complexity, not on unit cost. A part with internal channels, organic ribs or a shape that would need five setups on a mill is a good printed candidate at any volume. A simple flanged bushing is not, no matter how the marketing reads.

Volume changes the answer. Powder bed fusion has a high cost per cubic centimetre and a build rate measured in tens of cubic centimetres per hour. Once a part number reaches a few thousand units a year, die casting or machining from bar usually beats it on cost, and the machined part will have better and more uniform mechanical properties.

Lead time is the other axis. A printed prototype can be in hand in days without tooling. A machined prototype from 6061-T6 or 7075 also ships fast when the shop has the stock, and it can be anodized, hardcoated or bead blasted to match the final finish. For a concept car that will be photographed, finish matters.

The sensible workflow on a concept vehicle is to print the geometry you cannot machine, machine the interfaces you cannot print, and validate both with the same inspection plan.