Chantal Paquet | National Research Council Canada: Can we completely eliminate support structures and layer lines in 3D printing?
00:00:33 - 00:01:52
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Summary of the clip:
Can we completely eliminate support structures and layer lines in 3D printing?
Tomographic Additive Manufacturing, often referred to as Volumetric Additive Manufacturing (VAM), represents a paradigm shift from traditional layer-by-layer 3D printing. By utilizing a digital light processing (DLP) projector to cast dynamic light patterns onto a rotating vial of photosensitive resin, the technique constructs entire 3D geometries simultaneously rather than sequentially. This parallel light exposure triggers localized polymerization only within specific voxels where the cumulative light dose crosses the threshold.
The primary advantages of this volumetric approach lie in speed, surface quality, and structural freedom. Because the entire object is printed concurrently within a self-supporting resin medium, there is no need for sacrificial support structures. This eliminates the tedious post-processing steps typical of stereolithography (SLA) or fused deposition modeling (FDM) methods.
Furthermore, the absence of discrete layering means the finished parts are free from staircase artifacts, resulting in exceptionally smooth surfaces. This makes the technology highly appealing for microfluidics, bioprinting, and optical components like lenses, where surface roughness directly impacts performance.
In this short video, you can learn:
* How dynamic light patterns and rotating vials achieve volumetric polymerization.
* Why volumetric printing eliminates the need for sacrificial support structures.
* The technical benefits of a layerless finish for optics and microfluidics.
📋 **Clip Abstract** This clip introduces Tomographic Additive Manufacturing (VAM) and explains how projecting 3D light patterns into a rotating photo-resin vial allows for rapid, support-free printing. Chantal Paquet highlights its advantages, including the elimination of layer artifacts to produce ultra-smooth surface finishes.
#VolumetricAdditiveManufacturing, #Tomographic3DPrinting, #VolumetricPolymerization, #Layerless3DPrinting, #PrecisionOptics, #Microfluidics
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00:06:02 - 00:08:04
How do you solve the light attenuation bottleneck in volumetric 3D printing?
How do we overcome the fundamental trade-off between light attenuation and feature resolution in vat photopolymerization?
In projection-based stereolithography, achieving high-fidelity micro-features is historically limited by light attenuation. As the projected light penetrates the liquid photoresin, the photoinitiator absorbs the energy, causing a rapid decay in light intensity. To ensure sufficient light reaches the build platform to initiate polymerization, formulation chemists are typically forced to use low photoinitiator concentrations, which inherently limits the spatial control of the cure.
This low concentration of photoinitiator yields slow polymerization kinetics, allowing active radicals to diffuse outside the illuminated zones. This diffusion manifests as blurry, inaccurate features and poorly defined boundaries. By shifting the process strategy to pre-coating the base object, it becomes possible to deploy resins with tenfold higher photoinitiator concentrations, drastically accelerating polymerization rates and arresting radical diffusion.
Leveraging this high-concentration formulation enables exceptional spatial resolution, allowing successful patterning down to single-pixel line widths of approximately 50 microns. The rapid reaction kinetics enable near-instantaneous curing within seconds upon light exposure. Once the green state pattern is resolved, the uncured resin is washed away, and the part is metallized via copper plating to yield highly conductive, finely patterned functional components.
In this short video, you can learn:
* How photoinitiator concentration and light attenuation limit resolution in projection micro-stereolithography.
* The mechanism of radical diffusion that causes blurry features and dimensional inaccuracy in low-concentration resins.
* A novel pre-coating methodology that enables tenfold higher photoinitiator loading for rapid, single-pixel resolution and subsequent copper plating.
📋 **Clip Abstract** The speaker explains how low photoinitiator concentrations in projection stereolithography lead to slow polymerization rates and blurry prints due to light attenuation and radical diffusion. She demonstrates that pre-coating the base object allows for a tenfold increase in photoinitiator concentration, enabling rapid, single-pixel printing down to 50 microns that can be finished with copper plating.
🎤 Speaker: Chantal Paquet
🏢 Company: National Research Council Canada
📅 Event: Additive, Sustainable or 3D Electronics Innovations Day 2025
📍 Location: TechBlick Online Platform
🌐 Learn more at the next TechBlick event: https://www.techblick.com
#VolumetricAdditiveManufacturing, #PhotopolymerizationKinetics, #DipCoating, #Micro3DPrinting, #3DPrintedElectronics, #AdditiveElectronics
00:10:57 - 00:12:51
Can volumetric additive manufacturing displace Laser Direct Structuring for 3D electronics?
Can volumetric additive manufacturing displace Laser Direct Structuring for 3D electronics?
When comparing tomographic additive manufacturing (VAM) to industry standards like Laser Direct Structuring (LDS), the primary differentiator is processing speed and design freedom. LDS relies on sequential laser rastering to activate catalysts embedded in plastic substrates, which can be slow and limited by the laser's line-of-sight. In contrast, VAM patterns entire 3D conductive pathways simultaneously through parallel light projection.
This projection-based approach compresses patterning times down to mere seconds, compared to the minutes or hours required by traditional Digital Light Processing (DLP) or laser-based systems. While DLP must build structures layer-by-layer, VAM's volumetric execution cures the entire design envelope at once. This speed advantage makes it a highly competitive candidate for high-throughput manufacturing of customized 3D electronics.
Furthermore, VAM allows for the direct overprinting of functional polymers on virtually any arbitrary, pre-existing 3D surface—including glass and metals. Combined with subsequent electroless copper plating, this method opens up commercial pathways for printing high-frequency RF antennas and sensor arrays directly onto complex consumer product housings.
In this short video, you can learn:
* The speed comparison between parallel VAM projection and sequential laser rastering.
* Why volumetric printing scales differently than layer-by-layer DLP processes.
* The commercial implications of overprinting electronics onto arbitrary, pre-existing objects.
📋 **Clip Abstract** This clip compares volumetric additive manufacturing to Laser Direct Structuring and Digital Light Processing for electronics integration. Chantal Paquet details how VAM's parallel light exposure slashes patterning times to seconds while enabling seamless electronics integration on complex 3D geometries.
#VolumetricAdditiveManufacturing, #LaserDirectStructuring, #ElectrolessCopperPlating, #3DStructuralElectronics, #MoldedInterconnectDevices, #ConformalAntennas