Tech Briefs Magazine - June 2022 - 38

Manufacturing &
Prototyping
Nicknamed " the replicator " after the
fictional device in " Star Trek " that can
instantly fabricate nearly any object, the
Computed Axial Lithography (CAL)
technology developed by LLNL and UC
Berkeley is inspired by computed tomography
(CT) imaging methods. CAL
works by computing projections from
many angles through a digital model of a
target object, optimizing these projections
computationally and then delivering
them into a rotating volume of photosensitive
resin using a digital light
projector. Over time, the projected light
patterns reconstruct, or build up, a 3D
light dose distribution in the material,
curing the object at points exceeding a
light threshold while the vat of resin
spins. The fully formed object materializes
in mere seconds - far faster than traditional
layer-by-layer 3D printing techniques
- and then the vat is drained to
retrieve the part.
Combining a new microscale VAM
technique called micro-CAL, which uses
a laser instead of an LED source, with a
nanocomposite glass resin developed by
the German company Glassomer and
the University of Freiburg, UC Berkeley
researchers reported the production of
sturdy, complex microstructure glass objects
with a surface roughness of just six
nanometers with features down to a minimum
of 50 microns.
UC Berkeley Associate Professor of Mechanical
Engineering Hayden Taylor, the
ing process. The team found the breaking
loads of CAL-printed structures were
more tightly clustered together, meaning
that researchers could have more
confidence in in the breaking load of
CAL-printed components over conventional
techniques.
Researchers at Lawrence Livermore National
Laboratory and the University of California,
Berkeley demonstrated the ability to 3D print
microscopic objects in silica glass through volumetric
additive manufacturing, part of an effort
to produce delicate, layer-less optics that
can be built in seconds or minutes. (Image:
Adam Lau/Berkeley Engineering)
project's Principal Investigator, said the
micro-CAL process, which produces a
higher dose of light and cures 3D objects
faster and at higher resolution, combined
with the nanocomposite resins characterized
at LLNL proved a " perfect match for
each other, " creating " striking results in
the strength of the printed objects. "
The team compared the breaking
strength of glass built with micro CAL
against objects of the same size made by
a more conventional layer-based printPainting
3D-Printed Objects
An efficient painting method reaches nooks and crannies.
Rutgers University, New Brunswick, NJ
E
ngineers have created a highly effective
way to paint complex 3D-printed
objects, such as lightweight frames for
aircraft and biomedical stents, that could
save manufacturers time and money and
provide new opportunities to create
" smart skins " for printed parts.
Conventional sprays and brushes can't
reach all of the nooks and crannies in
complex 3D-printed objects but the new
technique coats any exposed surface and
fosters rapid prototyping. The technique
is a more efficient way to coat not only
conventional objects but even hydrogel
soft robots. The coatings are robust
enough to survive complete im mersion
in water and repeated swelling and
de-swelling by humidity.
38
The engineers discovered new capabilities
of a technology that creates a fine
spray of droplets by applying a voltage to
fluid flowing through a nozzle. This
technique - electrospray deposition -
has been used mainly for analytical
chemistry. But in recent decades, it has
also been used in lab-scale demonstrations
of coatings that deliver vaccines,
light-absorbing layers of solar cells, and
fluorescent quantum dots (tiny particles)
for LED displays.
Using the approach, engineers are
building an accessory for 3D printers
that will, for the first time, allow automated
coating of 3D-printed parts with
functional, protective, or aesthetic layers
of paint. The technique features much
www.techbriefs.com
1 cm
A hydrogel lattice without (left) and with
(right) coating. (Image: Jonathan P. Singer/Rutgers
Uni versity - New Brunswick)
Tech Briefs, June 2022
For the past several years, the LLNL/
UC Berkeley VAM collaboration has experimented
with different resins and materials
to create intricate objects. The latest
advancement stems from a study with
UC Berkeley to discover new classes of
versatile materials that could expand the
range of chemistries and material properties
achievable through the VAM method.
According to the researchers. VAM-printed
glass could impact solid-glass devices
with microscopic features, produce optical
components with more geometric
freedom and at higher speeds and could
potentially enable new functions or lower-cost
products.
Real-world applications could include
micro-optics in high-quality cameras,
consumer electronics, biomedical imaging,
chemical sensors, virtual-reality
headsets, advanced microscopes and microfluidics
with challenging 3D geometries
such as " lab-on-a-chip " applications
(where microscopic channels are needed
for medical diagnostics), fundamental
scientific studies, nanomaterial manufacturing,
and drug screening.
For more
Martin at martin59@llnl.gov; 935-424-4175.
information, contact Carrie
TB Manufacturing Prototyping 0622_1.indd 38
Cov
ToC
5/19/22 1:30 PM
http://www.techbriefs.com http://info.hotims.com/82322-850

Tech Briefs Magazine - June 2022

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