3D-Printed Tourbillon Demo Keeps The Time With Style

February 4, 2019 by Dan Maloney 9 Comments

It may only run for a brief time, and it’s too big for use in an actual wristwatch, but this 3D-printed tourbillon is a great demonstration of the lengths watchmakers will go to to keep mechanical timepieces accurate.

For those not familiar with tourbillons, [Kristina Panos] did a great overview of these mechanical marvels. Briefly, a tourbillon is a movement for a timepiece that aims to eliminate inaccuracy caused by gravity pulling on the mechanism unevenly. By spinning the entire escapement, the tourbillon averages out the effect of gravity and increases the movement’s accuracy. For [EB], the point of a 3D-printed tourbillon is mainly to demonstrate how they work, and to show off some pretty decent mechanical chops. Almost the entire mechanism is printed, with just a bearing being necessary to keep things moving; a pair of shafts can either be metal or fragments of filament. Even the mainspring is printed, which we always find to be a neat trick. And the video below shows it to be satisfyingly clicky.

[EB] has entered this tourbillon in the 3D Printed Gears, Pulleys, and Cams Contest that’s running now through February 19th. You’ve still got plenty of time to get your entries in. We can’t wait to see what everyone comes up with!

Continue reading “3D-Printed Tourbillon Demo Keeps The Time With Style” →

Geared Cable Winder Keeps Vive Sync Cable Neatly Wound

February 1, 2019 by Dan Maloney 8 Comments

Long cables are only neat once – before they’re first unwrapped. Once that little cable tie is taken off, a cable is more likely to end up rats-nested than neatly coiled.

Preventing that is the idea behind this 3D-printed cable reel. The cable that [Kevin Balke] wants to make easier to deal with is a 50 foot (15 meters) long Vive lighthouse sync cable. That seems a bit much to us, but it makes sense to separate the lighthouses as much as possible and mount them up high enough for the VR system to work properly.

[Kevin] put a good deal of effort into making this cable reel, which looks a little like an oversize baitcasting-style fishing reel. The cable spool turns on a crank that also runs a 5:1 reduction geartrain powering a shaft with a deep, shallow-pitch crossback thread. An idler runs in the thread and works back and forth across the spool, laying up the incoming cable neatly. [Kevin] reports that the reciprocating mechanism was the hardest bit to print, as surface finish affected the mechanism’s operation as much as the geometry of the mating parts. The video below shows it working smoothly; we wonder how much this could be scaled up for tidying up larger cables and hoses.

This is another great entry in our 3D Printed Gears, Pulleys, and Cams Contest. The contest runs through February 19th, so there’s still plenty of time to get your entries in. Check out [Kevin]’s entry along with all the others, and see what you can come up with.

Continue reading “Geared Cable Winder Keeps Vive Sync Cable Neatly Wound” →

3D Print That Charging Dock For Your 3DS

January 31, 2019 by Brian Benchoff 15 Comments

The Switch is the new hotness and everyone wants Nintendo’s new portable gaming rig nestled in a dock next to their TV, but what about Nintendo’s other portable gaming system? Yes, the New Nintendo 3DS can get a charging dock, and you can 3D print it with swappable plates that make it look like something straight out of the Nintendo store.

[Hobby Hoarder] created this charging dock for the New Nintendo 3DS as a 3D printing project, with the goal of having everything printable without supports, and able to be constructed without any special tools. Printing a box is easy enough, but the real trick is how to charge the 3DS without any special tools. For this, [Hobby Hoarder] turned to the small charging contacts on the side of the console. All you do is apply power and ground to these contacts, and the 3DS charges.

Normally, adding contacts requires pogo pins or hilariously expensive connectors, but [Hobby Hoarder] has an interesting solution: just add some metal contacts constructed from LED leads or paper clips, and mount it on a spring-loaded slider. A regular ‘ol USB cable is scavenged, the wires stripped, and the red and black lines are attached to the spring-loaded slider.

There is a slight issue with the charging voltage in this setup; the 3DS charges at 4.6 Volts, and USB provides 5 Volts. If you want to keep everything within exacting specs, you could add an LDO linear regulator, but there might be issues with heat dissipation. You could use a buck converter, but at 0.4 Volts, you’re probably better off going with the ‘aaay yolo’ theory of engineering.

[Hobby Hoarder] produced a few great videos detailing this build, and one awesome video detailing how to print multicolored faceplates for this charging dock. It’s an excellent project, and a great example of what can be done with 3D printing and simple tools.

Continue reading “3D Print That Charging Dock For Your 3DS” →

This 3D Printer Is Soft On Robots

January 30, 2019 by Al Williams No comments

It always seems to us that the best robots mimic things that are alive. For an example look no further than the 3D printed mesh structures from researchers at North Carolina State University. External magnetic fields make the mesh-like “robot” flex and move while floating in water. The mechanism can grab small objects and carry something as delicate as a water droplet.

The key is a viscous toothpaste-like ink made from silicone microbeads, iron carbonyl particles, and liquid silicone. The resulting paste is amenable to 3D printing before being cured in an oven. Of course, the iron is the element that makes the thing sensitive to magnetic fields. You can see several videos of it in action, below.

Continue reading “This 3D Printer Is Soft On Robots” →

3D Printed Wheels Get Some Much Needed Grip

January 30, 2019 by Tom Nardi 11 Comments

You’d be hard-pressed to find more ardent supporters of 3D printing then we here at Hackaday; the sound of NEMA 17 steppers pushing an i3 through its motions sounds like a choir of angels to our ears. But we have to admit that the hard plastic components produced by desktop 3D printers aren’t ideal for a number of applications. For example, the slick plastic is useless for all but the most rudimentary of wheels. Sure there are flexible filaments that can give a printed wheel a bit of grip, but they came with their own set of problems (not to mention, cost).

In the video after the break, [Design/Forge] demonstrates a clever method for fitting polyurethane rubber “tires” onto 3D printed hubs which is sure to be of interest to anyone who’s in the market for high quality bespoke wheels for their project. The final result looks extremely professional, and while there’s a considerable amount of preparation that goes into it, once you’re set up you should be able to pump these out quickly and cheaply.

The process begins with a 3D printed mold pattern, which includes the final tire tread texture. This means you can create tire treads of any design you wish, which should have some creative as well as practical applications. The printed part is then submerged in silicone rubber and allowed to cure for 8 hours. Once solidified, the silicone rubber becomes the mold used for the next steps, and the original printed part is no longer needed.

The second half of the process is 3D printing the wheels to which the tires will be attached. These will be much smaller than the original 3D printed component, and fit inside of the silicone mold. The outside diameter of the printed wheel is slightly smaller than the inside diameter of the mold, which gives [Design/Forge] the space to pour in the pigmented polyurethane rubber. The attentive viewer will note that the 3D printed wheel has a slight ribbed texture designed into it, so that there will be more surface area for the polyurethane to adhere to. Once removed from the mold and cleaned up a bit, the final product really does look fantastic; and reminds us of a giant scale LEGO wheel.

Whether you’re casting metal parts or just want a pair of truly custom earbuds, creating silicone molds from 3D printed parts is an extremely useful skill to familiarize yourself with. Though even if you don’t have a 3D printer, there’s something to be said for knowing how to mold and cast real-world objects as well.

Continue reading “3D Printed Wheels Get Some Much Needed Grip” →

Supportless Overhangs: Just Reorient Gravity By 90 Degrees

January 30, 2019 by Donald Papp 14 Comments

The 3D print by [critsrandom] in the image above may not look like much at first glance, until one realizes that the 90 degree overhang has no supports whatsoever. Never mind the messy bottom surface, and never mind that the part shown might avoid the problem entirely with some simple supports or a different print orientation; the fact that it printed at all is incredible.

[critsrandom] shared the method in a post on Reddit, and it consists simply of laying the 3D printer on its side. When the print head reaches the overhang, the fact that it is printing sideways is what allows that spot to make the leap from “impossible” to merely “messy”. Necessary? Probably not, but a neat trick nevertheless.

Tilted 3D printers is something that we’ve seen in the past, but for different reasons. When combined with a belt-driven build platform, a tilted printer has a theoretically infinite build volume (in one axis, anyway.)

Plastics: PETG

January 29, 2019 by Dan Maloney 30 Comments

You’d be hard-pressed to walk down nearly any aisle of a modern food store without coming across something made of plastic. From jars of peanut butter to bottles of soda, along with the trays that hold cookies firmly in place to prevent breakage or let a meal go directly from freezer to microwave, food is often in very close contact with a plastic that is specifically engineered for the job: polyethylene terephthalate, or PET.

For makers of non-food objects, PET and more importantly its derivative, PETG, also happen to have excellent properties that make them the superior choice for 3D-printing filament for some applications. Here’s a look at the chemistry of polyester resins, and how just one slight change can turn a synthetic fiber into a rather useful 3D-printing filament.

Continue reading “Plastics: PETG” →