Sep 25, 2016

DIY 3D Printed Compressed Air Tank by CVRA

CVRA (Club Vaudois de Robotique Autonome) is a group of students and engineers passionate about robotics. It is based in Renens, Switzerland. They needed a compressed air tank for their robot project that could hold 4 bar (400kPa) of pressure.
They made several 3d printed prototypes in PLA and were successful in the end with tank holding some 6,5 bar sealed with some acrylic coating.
Interesting experiment, but be aware that pressurizing plastic containers with gas can lead to serious explosion.

Here is the advanced prototype sealed with "Doc Blue" sealant pressure tested under water:

Project homepage with extensive information and progression of development:

Here is the Hackaday post with lot of safety concerns and possible problems with this concept:

Stay safe kids!

Anti-Taser 3D Printed Chainmail

GreekGadgetGuru 3d printed a DIY mail armor and proved that it works well against taser stun baton.

It is also slightly slash and cut resistant ...

We are living in a strange times kids. Just sayin' ...

Makerbot Releases New 3D Printers and Declares the End of Consumer Market

Makerbot released their new 3d printers in some sort of public display of masochism. Why did you do this Makerbot?
The 3d printers are basically just a slight upgrades from previous models with larger print volume. It is aimed at "professional" market. Looks like you guys are mostly just not good enough profitable group for their stuff.

You can see their new stuff here;

Oh yes, they also have a new free slicer: the Makerbot Print

Here is Angus from Maker's Muse with some thoughts I can mostly agree with:

3D Printing and Marxism

We are still in a world that is dominated by political debates from old times and old technological systems.

Source: unknown

Sep 20, 2016

NinjaFlex 3D Printed Metamaterial Mechanisms

Team of researchers at Hasso Plattner Institute, Potsdam, Germany developed a technique that gives internal structure to objects that they printed on Ultimaker 2 in NinjaFlex filament. Since the structure is designed it gives the object mechanical movements enabling it to act as a tool or a device. 

From project description:
Recently, researchers started to engineer not only the outer shape of objects, but also their internal microstructure. Such objects, typically based on 3D cell grids, are also known as metamaterials. Metamaterials have been used, for example, to create materials with soft and hard regions.

So far, metamaterials were understood as materials—we want to think of them as machines. We demonstrate metamaterial objects that perform a mechanical function. Such metamaterial mechanisms consist of a single block of material the cells of which play together in a well-defined way in order to achieve macroscopic movement. Our metamaterial door latch, for example, transforms the rotary movement of its handle into a linear motion of the latch. Our metamaterial Jansen walker consists of a single block of cells—that can walk. The key element behind our metamaterial mechanisms is a specialized type of cell, the only ability of which is to shear.

In order to allow users to create metamaterial mechanisms efficiently we implemented a specialized 3D editor. It allows users to place different types of cells, including the shear cell, thereby allowing users to add mechanical functionality to their objects. To help users verify their designs during editing, our editor allows users to apply forces and simulates how the object deforms in response.

Personally I find that the software for design of those metamaterials is the most interesting part and would be of great use for DIY and Maker community. I don't know who has the property rights to that code, but I think if the research was funded by public money the code should be open sourced.

Project homepage:

PDF research paper with much more information:

MERL 5D Printing on a Custom Delta

After 4D printing comes 5d printing. It's just a fancy name for five axis 3D printing that enables more strength due to layers being extruded in optimized paths to resist more pressure force.
It is developed at  Mitsubishi Electric Research Laboratories (MERL) on a custom delta machine with movable printbed.

Here is the explainer video:

PDF research paper on the topic:

More on the researcher:

Sep 19, 2016

DIY Polycarbonate Sheet Dehumidifier Chamber for your Filament

Akshay Gupta developed a 3d printing filament dehumidifier you can build yourself. It is made from common polycarbonate sheets and uses an Arduino, a cross flow fan, silica gel desiccant, sensors and a 100W heater to maintain a specific temperature and humidity in the chamber.

As you can see it can hold many spools of filament:

Looks like the great solution to keep your filament dry.

Detailed build guide:

Octowatch Pebble Smartwatch App

Jason Gullickson from Wisconsin developed a small app for the Pebble smartwatch that enables you to monitor your 3d printer remotely via Octoprint API.

Get it at: page:

Voodoo of Prusa I3 XYZ Automatic Leveling

Read more about it at Prusa homepage: