Living Hinges at the Next Level

First of all, a living hinge is not a biological entity nor does it move on its own. Think of the top of a Tic Tac container where the lid and the cover are a single piece, and the thin plastic holding them together flexes to allow you to reach the candies disguised as mints. [Xiaoyu “Rayne” Zheng] at Virginia Tech designed a method of multimaterial programmable additive manufacturing which is fancy-ese for printing with more than one type of material.

The process works under the premise of printing a 3D latticework, similar to the “FILL” function of a consumer printer. Each segment of material is determined by the software and mixed on the spot by the printer and cured before moving onto the next segment. Like building a bridge one beam at a time, if that bridge were meant for tardigrades and many beams were fabricated each minute. Mixing up each segment as needed means that a different recipe results in a different rigidity, so it is possible to make a robotic leg with stiff “bones” and flexible “joints.”

We love printing in different materials, even if it is only one medium at a time. Printing in metal is useful and could be consumer level soon, but you can print in chocolate right now.

Via Phys.org. Thank you again for the tip, [Qes].

Parametric Hinges with Tinkercad

Simple tools are great, but sometimes it is most convenient to just use something easy, and since it gets the work done, you don’t try out some of the other features. Tinkercad is a great example of that kind of program. It is actually quite powerful, but many people just use it in the simplest way possible. [Chuck] noticed a video about making a 3D-printed hinge using Tinkercad and in that video [Nerys] manually placed a bunch of hinges using cut and paste along with the arrow keys for positioning. While it worked, it wasn’t the most elegant way to do it, so [Chuck] made a video showing how to do it parametrically. You can see that video below, along with the original hinge video.

There are really two major techniques [Chuck] shows. First, he adds the necessary pieces to create the hinges to the Tinkercad toolbox. That makes it really simple to add them to any of your future designs. Second, he uses a combination of numeric parameters and duplication to quickly and precisely place the hinge components across another object — in this case a Batman logo.

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Opening the Door to Functional Prints

If you are going to do something as a joke, there is nothing to say that you can’t do a nice job of it. If you’re like [Michael], a whimsical statement like “Wouldn’t it be funny to put Gr├╝nderzeit-style doors on the server cabinet?” might lead down a slippery slope. True to his word, [Michael] not only installed the promised doors, but he did a darn nice job of it.

Buying new doors was the easy part because the door frame and hinges were not standardized back then, so there was nothing on the server cabinet to his mount doors. He walks us through all the steps but the most interesting point was the 3D printed door hinges which [Michael] modeled himself and printed in steel. His new hinges feature his personal flair, with some Voronoi patterning while matching the shape of the originals. We love seeing 3D printed parts used as functional hardware, and hinges are certainly a piece of hardware meant to hold up under pressure.

This is not the first 3D printed door hardware we’ve seen. Check out this innovative latch printed as a single piece and here’s the skinny on making flexible objects yourself.

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Blinding Shades Hide Wearer’s Four Eyes

We ran into [Garrett Mace] at Maker Faire. He wasn’t exhibiting, but in keeping with the fun he made something to show off. This pair of RGB LED Shades was assembled the night before. They may have been hacked together, but they were in no way a hack. Especially of interest to us is the hinge design which is made of PCB substrate and a few machine screws.

Our video above does a pretty good job of showing off the blinky patterns he coded. What’s surprising to us is that the wearer is almost no view of the light the specs are emitting. The slots aren’t that hard to see out of either, and they hide [Garrett’s] prescription glasses quite nicely.┬áThis pair steps up from the single color version we saw a couple of years back. That set was also on display, but you really do need to get a closer look at the newer design. Luckily it took us so long to get this video edited that the Macetech blog now has complete details.

Simple laptop conversion

[Jakob] sent in his method of dealing with broken laptop hinges. Broken hinges are a plague. We have no less than 4 laptops lying around that are beyond repair with broken hinges. Some are just propped up against things, some have had box hinges glued to them and some are just waiting to die slowly from non use. [Jakob] has a nice neat conversion where he basically made a tablet. We’ve seen that before as well as picture frames. His version, while being quite possibly easier than most of the others, has a neat design aspect. An extended lip at the bottom fits in a groove in a plastic slab. All in one PC becomes a tablet in an instant. Not too shabby for a broken laptop. It looks like he needs to pop a touch screen kit on it though.