Additive Manufacturing Strategies

Electric 3D Printing by Adrian Bowyer May Take Only a Few Seconds to Build Objects

ST Medical Devices

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RepRap Ltd. user and hero of the open-source 3D printing movement Adrian Bowyer endeavors to use an electric current to create a 3D printed liquid plastic monomer that will polymerize in just a single scan—and in just a few seconds. If feasible this may be a much faster path to 3D printing objects.

By combining three different innovative techniques Adrian thinks that he may be able to come up with a new innovative 3D printing method. The reverse-CT scan 3D printing technique from University of California (UC), Berkeley and Lawrence Livermore employs a printer projecting scans onto rotating photosensitive resin. The device, aptly named after the Star Trek Replicator, works through computed axial lithography (CAL).

“Basically, you’ve got an off-the-shelf video projector, which I literally brought in from home, and then you plug it into a laptop and use it to project a series of computed images, while a motor turns a cylinder that has a 3D-printing resin in it,” explained Hayden Taylor, assistant professor of mechanical engineering at the UC Berkeley, and senior author of a recently published paper on the technology.

“Obviously there are a lot of subtleties to it — how you formulate the resin, and, above all, how you compute the images that are going to be projected, but the barrier to creating a very simple version of this tool is not that high.”

The Berkeley/Livermore system [thanks to B. E. Kelly et al., Science 10.1126/science.aau7114 (2019)

The open-source electric 3D scanning technique for 3D reconstruction from Spectra offering a seamless technology for medical imaging via electrical conductivity, permittivity, and ‘impedance of a part of the body’ from electrode measurements—transferred via small AC currents.

“This impedance information is then used to create an image reconstruction using techniques like a CATSCAN. By running multiple frequencies through the body cross-section of interest, you can obtain further information on dielectric spectrums of individual materials located between the electrodes,” states the Spectra team. “This multi-dimensional data is perfect for machine learning to delve into and make EIT and even more powerful tool for transforming human health!”

A preliminary scan of lung cross-section by the Spectra system [thanks to the Spectra Crowdfunder page].

Last, Bowyer uses Electropolymerisation as a coating procedure and one that is conducive for small areas, applying an electrochemical coating.

“The polymerization solution contains the monomer, solvent, and the supporting electrolyte. This method can be further divided into potentiodynamic, galvanostatic, and potentiostatic electropolymerization,” state the researchers studying the process in their recent paper.

Nanowires made on a surface by electropolymerisation; scale bar is 10 μm [thanks to the Science Direct article on electropolymerisation].

Combining these three concepts, Bowyer plans to use a bath of monomer that will polymerize with an electric current, with the system programmed ‘using the reverse of the Spectra system.’ Ultimately, the liquid monomer would be inside a cylindrical bath with an array of electrodes spanning the whole area. A controller would be used to electrify the monomer enough to solidify it and turn into what would feasibly be like a 3D print—but produced by a machine with no moving parts and created in mere seconds.

The Electric 3D Printing system

“The entire machine could, of course, be printed in a conventional two-filament RepRap if one filament were conducting,” states Bowyer.

“Finally, and very speculatively, an even more ambitious possibility would be to move from organic chemistry to inorganic, and to replace the bath of monomer with an electrolyte such as copper acetate or copper sulphate.  It might then be possible to cause the copper to precipitate at any location in 3D space if the pattern of electric currents through the liquid could be got right.”

RepRap Ltd. continues to be a dynamic force in 3D printing, behind projects such as sensory wearables and more, along with other users who continue to explore conductivity within 3D printing from creating supercapacitors to smart materials and sensors, as well as items like composites and more.

What do you think of this news? Let us know your thoughts! Join the discussion of this and other 3D printing topics at 3DPrintBoard.com.

[Source / Images: RepRapLtd.]

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