Welcome to RAWWERKS! This site features the work of Raymond Weitekamp. I mostly make materials and music.

Additive Manufacturing Is Cheaper Than You Think

Today’s buzz around 3D printing promises a future of mass individualization, a market-of-one paradigm. The ability to make individually customized parts is a unique opportunity for additive manufacturing with 3D printers. On the opposite end of the spectrum, high-throughput manufacturing technologies such as injection molding offer the economies of scale for producing very large volumes of identical parts. But where is the cross-over point? Assuming we can make the same quality parts with either approach, there must be a lot size between one and many where the costs are equal. »

SF Cleantech Pitchfest

I gave a short presentation on my ARPA-E supported project towards paint-on window coatings at Berkeley Lab’s Cleantech Pitchfest in San Francisco on June 1, 2016. To view the entire Pitchfest with the other 5 presenters, see https://youtu.be/gMCt2f_NlEY DIY Efficient Windows: Applying paint-on coatings for energy-efficient windows Replacing millions of porous windows with energy-efficient versions in older buildings and homes can be prohibitively expensive. Berkeley Lab’s Raymond Weitekamp, a Caltech PhD, has a new approach: an inexpensive, paint-on, energy-efficient coating that can be applied simply and evenly without the help of a professional—while the windows are still in place. »

What is Structural Color?

Our everyday sense of color is based on the absorption of light. If our shirt appears red, a dye or pigment is absorbing all of the colors except for red. By contrast, structural color is based on reflection, not absorption. Structural color is an important consequence of the fact that light is a wave. We can define the color either through the wavelength — the physical distance between the repeating crests, or the period — the amount of time for the wave to repeat. »

Teaching Disabilities

I really enjoyed this recent interview of Eric Weinstein on The Tim Ferriss Show Podcast. One of the most powerful moments for me was when Eric says, “We don’t talk about teaching disabilities, we talk about learning disabilities.” (1:08:41) Eric continues: A lot of the kids that I want are kids that have been labelled learning disabled but they are actually superlearners, they’re like learners on steroids who have some deficits to pay for their superpower. »

Materials Science Startup Lessons

I’ve learned a lot over the last year of running polySpectra, as part of the Cyclotron Road accelerator program at LBNL. Here are a few bite-sized tips that might help you in your endeavors: A prototype is worth a million words. Most people have a very hard time hearing descriptions of chemical and physical properties and translating that into an accurate mental image. Even people with PhDs in your field may not immediately understand what you are talking about (although they will pretend they do, which is even worse). »