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Jonathan Weiss
3D Printing - Biofabrication - Engineering

About

I'm a 5th-year Bioengineering Ph.D. candidate at Stanford developing low-cost, high-throughput 3D-printing technologies for generating cardiac tissues in Mark Skylar-Scott's 3D-Bioprinting Lab.

I have extensive experience in 3D computer-aided design (CAD), mechanical device prototyping, 3D printing, and biofabrication. I use 3D bioprinting technologies, particularly novel multinozzle printheads, to create soft-material structures such as silicone elastomers, photocurable hydrogels, and cell-laden engineered tissues. My work includes printing custom-geometry heart valves and small-scale cardiac and stem cell tissue models, which I use to study function, growth, and maturation.

I am currently seeking a full-time R&D position beginning in fall 2025 where I can blend these engineering disciplines to develop impactful technologies with applications in biotechnology, regenerative medicine, electronics, sustainability, and beyond.

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Publications

Google Scholar

Portfolio

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A low-cost ($300), open-source 3D printer for multimaterial and high-throughput direct ink writing. Designed from scratch and built using 3D-printed, laser-cut, and off-the-shelf components. Dozens have been assembled and shared with other research groups. See publication, and click image to learn more.
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An 8x4 (32) array multinozzle printhead for high-throughput embedded 3D printing. Printhead is 3D-printed using stereolithography and biocompatible resins. See video below, and click image for more information on printhead design.
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An array of 32 tree models printed with Carbopol in 3 minutes using the 32-multinozzle. See video below.
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Multimaterial gradient 3D printing of the Stanford "S" logo from white to yellow with Pluronic F-127 using a mixing nozzle.
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Multimaterial multinozzle 3D printing of an auxetic structure using silicnes of varying stiffness. See video below for actuation of this structure.
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Embedded 3D printing of the Stanford dragon using Carbopol.

Videos

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Uniaxial tensile testing of auxetic structures on a custom-built stepper motor strain device. Poisson ratio changes by the ratio of stiffness between the horizontal and vertical struts. Red is stiff silicone, blue is soft silicone.
3D printed trileaflet valve made from PEGDA subjected to pulmonary pressures and flows in an in vitro heart simulator.
Custom-made 8x4 stirplate array to accomodate custom 8x4 multinozzle printhead and well plate. All magnets are driven by a single stepper motor.
3D printing of stem cell embryoid body bioink embedded into basement gel. See publication, Large-Scale Production of Wholly Cellular Bioinks.
Multinozzle printing of enginered heart tissues (yellow) inside silicone support frames (blue).
Beating engineered heart tissue printed from single cardiomyocytes (central filament) and silicone (outer frame).
Demonstration of high-throughput multinozzle embedded 3D printing using an 8x4 array printhead. This 3.5 minute print takes 2 hours when using a single nozzle.

Other

In my free time, I enjoy guitar 🎸, chess 👑, running 🏃‍♂️, and Olympic weightlifting 🏋️.

I also tutor up to college-level calculus, physics, and other mathematics. Feel free to contact me with inquiries.

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