3D printed Math Grenade

Calculator hacks are fun and educational and an awesome way to show-off how 1337 your skills are. [Marcus Wu] is a maker who likes 3D printing and his Jumbo Curta Mechanical Calculator is a project from a different era. For those who are unfamiliar with the Curta, it is a mechanical calculator that was the brainchild of Curt Herzstark of Austria from the 1930s. The most interesting things about the design were the compactness and the complexity which baffled its first owners.

The contraption has setting sliders for input digits on the side of the main cylindrical body. A crank …read more http://pje.fyi/PWMztB

Paul Jacob Evans

Using 3D Printing To Speed Up Conventional Manufacturing

3D printers, is there anything they can’t do? Of course, and to many across the world, they’re little more than glorified keychain factories. Despite this, there’s yet another great application for 3D printers – they can be used to add speed and flexibility to traditional manufacturing operations.

A key feature of many manufacturing processes is the use of fixtures and jigs to hold parts during machining and assembly operations. These must be developed before manufacturing begins and must be custom made to suit the given application. Many manufacturers outsource the development of such fixturing, even in large operations – even …read more http://pje.fyi/PVt2hn

Paul Jacob Evans

The Almost Working, DIY Underwater Scooter Pistol Thing

A dive scooter, or a submersible ducted fan used by divers, is not a new invention. They’ve been around for years, used by everyone from the villain of the week on Miami Vice to professional divers. Now that high-capacity Lipos, 3D printers, and powerful brushless motors are cheap, it was only a matter of time before someone built a DIY dive scooter. [Peter Sripol] is the man, and he also built a dive scooter, underwater pistol thing.

[Peter]’s dive scooter is almost entirely 3D printed. That includes the ducted fans/thrusters. The electronics are what you would expect from a grab …read more http://pje.fyi/PRjd1l

Paul Jacob Evans

The 3D Printer Packing Problem

Form Labs recently announced the launch of the Fuse 1, a desktop SLS printer that will print all your parts using nylon powder and a laser. This a fundamentally different method of 3D printing as compared to filament-based machines, and the best way to use a Fuse 1 is to fill the entire volume of the machine with 3D printed parts. [Michael Fogelman] decided to investigate the 3D packing problem, and managed to fill this printer with the maximum number of 3D printed tugboats. If you’re wondering, it’s 113, as compared with 82 tiny Benchies using naive bin packing.

The …read more http://pje.fyi/PR44VZ

Paul Jacob Evans

A Crash Course in Thingiverse Customizer

OpenSCAD is a great way to create objects for 3D printing (or other purposes), especially if you are already used to programming. For things like front panels, it is great because you can easily make modifications and — if you wrote your code correctly–everything will just adjust itself to new positions.

However, what if you have a general-purpose piece of code, and you want people to have the ability to customize it? For example, consider this code: $fn=100; difference() { cube([25,25,5]); translate([4,4,-1]) cylinder(h=7,r=2); translate([25-4,4,-1]) cylinder(h=7,r=2); translate([4,25-4,-1]) cylinder(h=7,r=2); translate([25-4,25-4,-1]) cylinder(h=7,r=2); }

That creates the plate with four drill holes you see …read more http://pje.fyi/PQZl8K

Paul Jacob Evans

Another Helping Hands Build

[Punamenon2] wanted a soldering station with integrated helping hands. He couldn’t find one, but he decided it would be a good 3D printed project. In all fairness, this is really 3D printing integrating several off-the-shelf components including a magnifier, a soldering iron holder, a soldering iron cleaner, a couple of “octopus” tripods, and some alligator clips. Total cost? Less than $30.

In addition to holding the Frankenstein monster together, the 3D printed structure also provides a storage tray with special sloped edges to make removing small screws easier.

We were a bit surprised at the use of the cell phone …read more http://pje.fyi/PQ5KMm

Paul Jacob Evans

Animated Bathroom Sign

Once upon a time, pants were created. After a while, women were allowed to wear them too. This has made a lot of people happy and been widely regarded as a good thing. There is a problem, however – bathroom signage is largely predicated on the idea that there are two rigid genders which all humans must be sorted into, and they’re defined by whether you’re wearing pants or a dress. [Robb Godshaw], among others, disagrees with this, and set about building a gender fluid bathroom sign.

The project seeks to exploit the traditional symbols of “male” and “female” – …read more http://pje.fyi/PQ3Mr7

Paul Jacob Evans