Três Instructables, e um Site de Impressão 3D.

Impressão 3D sobre Papel, eis algo que merece bem destaque!

3D Printing PLA on Tissue Paper

clothbot

At the World Maker Faire this year in NYC I was sharing my experiments in 3D printing plastic on different substrates.
Here is what I have found works with tissue paper.

When it comes to printing plastic on tissue paper, the most important thing to do is keep the paper flat and wrinkle-free during the first few layers and stationary all the way through the build process.  Spray-on adhesive can't be used directly on the build surface because the paper will tear when you try to remove it at the end.

The only method I have found that works consistently is to construct a frame that sits snuggly around the build platform, flush with the surface, and glue the tissue paper to it around the perimeter.

http://www.instructables.com/id/3D-Printing-PLA-on-Tissue-Paper/

O nosso amigo brazilero2008 continua a fazer das suas, eis uma excelente Turbina Electroestática, que tal, para Projecto escolar?

Electrostatic Turbine

brazilero2008

Static electricity is high voltage (HV) at low current. That unexpected ZAP! occurring when you walk across a carpet and touch a metal object demonstrates HV conduction by ionized air particles. Ion wind turbines use electrostatic forces acting between these particles to produce mechanical movement.
I decided to go green by making this desk-top project from mostly dollar-store hardware; re-purposed plastic, cardboard and aluminum disposables from my kitchen recycling bin as well as some curbside junk from the neighbors. The turbine uses foil electrodes that encircle a plastic, tubular rotor.
Each electrode has a sharp edge that sprays a wind of positive or negative ions on the rotor's surface. When these electrodes are arranged so they alternate in polarity around the rotor, each electrode repels a rotor segment carrying the same charge and simultaneously attracts that rotor segment carrying charges deposited by the preceding electrode.

http://www.instructables.com/id/Ion-Wind-Turbine-Shows-Static-Electricity-in-Actio/

E mais um Instructable, atenção a este, não se brinca com a Segurança, tenham muito cuidado para onde apontam estas setas! Á parte disso, é um Brinquedo bacano, para praticar Tiro-ao-Alvo, sem sobressaltar os Vizinhos.

The B.E.A.S.T. - Bart's Eight Arrow ShooTer

bartolo

It doesn't happen often to me being really satisfied with a project, or calling one of my own projects 'megacool'.
This time it's different! I'm proodly presenting you my newest deadly weapon: The BEAST - bart's eight arrow shooter ;-)
Cool, fast, simple, powerful, accurate!

All you need:
- a climber's eight / figure eight / abseilacht
- a strong rubber band
- some paracord
- a few stretchers
and of course, a few arrows

http://www.instructables.com/id/The-BEAST-Barts-Eight-Arrow-ShooTer/

E vem-nos da Alemanha mais este Serviço de Impressão 3D, Beta-Prototypes, vão lá, e vejam se vos serve, para os vossos propósitos:

BETA-PROTOTYPES are specialists in rapid prototyping. Any 3D Model can be created to scale with our cutting edge 3D printers. Turn your digital designs into physical objects in just a few days. Lead the way with BETA-PROTOTYPES!

http://www.beta-prototypes.com/