Spider-Man Swings A Little Closer To Reality

October 26, 2021 by Matthew Carlson 5 Comments

Despite reading Hackaday daily and seeing the incredible things that people do, something comes along that just sort of blows you away every once in a while. Sometimes it’s just technically impressive, but often it is just, “I didn’t think that anyone would try this or even think of this.” [Joel Creates] is one such example with his Spider-Man wrist-mounted web-shooters.

Previously, [Joel] had built a web-slinging system based around a pressurized tank of hot glue worn like a backpack. What it lacked in miniaturization, it made up for in functionality. However, [JT of Build IRL] created a grappling-based Spider-Man system that fired ropes which got [Joel] thinking that perhaps the hot glue and the grappling system could be combined for a smaller overall package.

His solution is quite simple. Old CO2 cartridges filled with glue and a small nozzle drilled in are loaded into a quick-connect fitting. The hot glue is heated via an induction coil on a small tool belt before loading. A thermally insulating layer of paint and micro-vacuum spheres on the canister helps [Joel] place it in the wrist shooter without burning himself. A bike tire inflator with a lever-activated system forms the main assembly of the shooter. Using compressed air, the system fires a glob of hot glue at a surface and a metal web-shaped disk with holes and a rope attached to the blob of hot glue. As the glue rapidly cools, the metal disk provides a lot of surfaces for the adhesive to hang onto. Overall, the results are pretty impressive, but the engineering challenges make for an exciting journey. Everything from failed prototypes to failed power supplies seems to happen on this build.

Combined with some electromagnets, you could really have the whole spider package.

Thanks [Carson B] for sending this one in! Video after the break.

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3D Printed Preschooler Proof MP3 Player Takes A Beat-ing

October 8, 2021 by Ryan Flowers 9 Comments

Prototyping new ideas can be a lot of fun, but putting new projects in a durable enclosure can be a difficulty. This is especially the case when the user of this product is one of the most destructive forces in nature: A toddler! This is the circumstance that [blue blade] found himself in when he wanted to build a durable MP3 player for his grandson, and you can see the results of his work below the break.

The hardware is simple: A 16850 lithium-ion battery powers an MP3 Decoder/Amplifier module that plays MP3s stored on a Micro SD card. A speaker, power switch, and micro USB powered battery charger complete the build. What stands out most is the enclosure. Why?

When children are involved, durability isn’t a matter of product lifetime, it’s also a matter of safety. Items that are easily broken aren’t just useless, they can be dangerous. With this in mind, [blue blade] built a brightly colored enclosure with extra thick walls joined by metal bolts. Externally, a rounded cover bolts over the charger connector and Micro SD card slot. The only other protrusion is a lighted rocker switch for powering the MP3 player on and off.

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Huge Hand-Wired Ortho Is A Beautiful Battleship Keyboard

June 5, 2021 by Kristina Panos 11 Comments

There are all sorts of reasons to build your own keyboard, and we would argue that the more custom the layout, the easier it is to justify the time and expense. At least, that’s what we’re going with for this post about [GoldenSights]’ big, beautiful custom ortholinear called Nearer, as in nearer to perfect. Just look at this battleship!

[GoldenSights] has long wanted a mechanical keeb, but has never been into any of the commercial offerings. That goes double since none of them seem to have a vertical Home/End cluster, which [GoldenSights] has become quite attached to thanks to a space-saving Logitech rectangle keeb. But if you’re going to make your own keyboard, you should go all out, right? Right. So [GoldenSights] started by adding another 12 F keys and making it ortholinear. Then things got personal with an extra Backspace where Num Lock usually lives, and dedicated keys for switching between English, Korean, and Chinese.

[GoldenSights] wanted USB-C and so they used an Elite-C microcontroller, but there’s one big problem — it only has 24 pins, and according to the matrix math, the board needs 27 total. Rather than using an I/O expansion chip or a second microcontroller, they wired it up as duplex matrix. This is an alternative way of wiring up a matrix so that it’s closer to being square by doubling up the rows and halving the number of columns.

We don’t think [GoldenSights] gives themselves enough credit here. They say that they lean toward calling it assembly rather than a build, but we disagree with that assessment. [GoldenSights] broke in this giant keeb with giant write-up of the build, so go see for yourself. There’s a ton of build pictures and a fair amount of hot glue, so be warned.

Let’s talk about those keycaps for a second. The space bar was supposed to be black PBT like the others, but the keycap manufacturer didn’t have a 6u space bar in black and sent a gray one instead. Honestly, we like the way it looks. And we love that [GoldenSights] painstakingly laid out the keys on foam board before committing to a laser-cut metal switch plate.

Want a space-saving ortholinear that doesn’t feel too cramped? Check out this wafer-thin keyboard that’s designed to squat over your inferior laptop keys.

Via KBD and r/mk

Stitching Up Custom Belts

April 12, 2020 by Tom Nardi 17 Comments

If you’ve got a 3D printer, you’re probably familiar with the reinforced belts that are commonly used on the X and Y axis. These belts either come as long lengths that you attach to the machine on either end, or as a pre-sized loop. Traditional wisdom says you can’t just take a long length of belt and make your own custom loops out of it, but [Marcel Varallo] had his doubts about that.

This is a simple tip, but one that could get you out of a bind one day. Through experimentation, [Marcel] has found that you can use a length of so-called GT2 belt and make your own bespoke loop. The trick is, you need to attach the ends with something very strong that won’t hinder the normal operation of the belt. Anything hard or inflexible is right out the window, since the belt would bind up as soon as it had to go around a pulley.

It seems the key is to cut both ends of the belt very flat, making sure the belt pattern matches perfectly. Once they’ve been trimmed and aligned properly, you stitch them together with nylon thread. You want the stitches to be as tight as possible, and the more you do, the stronger the end result will be.

[Marcel] likes to follow this up with a bit of hot glue, being careful to make sure the hardened glue takes the shape of the belt’s teeth. The back side won’t be as important, but a thin layer is still best. The end result is a belt strong enough for most applications in just a few minutes.

Would we build a 3D printer using hand-stitched GT2 belts? Probably not. But during a global pandemic, when shipments of non-essential components are often being delayed, we could certainly see ourselves running some stitched together belts while we wait for the proper replacement to come in. Gotta keep those face shields printing.

Cheap Strain Relief By Casting Hot Glue In A 3D Print

February 11, 2020 by Donald Papp 52 Comments

[Daniel Roibert] found a way to add cheap strain relief to JST-XH connectors, better known to hobby aircraft folks as the charging and balance connectors on lithium-polymer battery packs. His solution is to cast them in hot glue, with the help of 3D printed molds. His project provides molds fitted for connectors with anywhere from two to eight conductors, so just pick the appropriate one and get printing. [Daniel] says to print the mold pieces in PETG, so that they can hold up to the temperature of melted glue.

The 3D models aren’t particularly intuitive to look at, but an instructional video makes everything clear. First coat the inside surfaces of the mold with a release agent (something like silicone oil should do the trick) and then a small amount of hot glue goes in the bottom. Next the connector is laid down on top of the glue, more glue is applied, and the top of the mold is pressed in. The small hole in the top isn’t for filling with glue, it’s to let excess escape as the mold is closed. After things cool completely, just pop apart the mold (little cutouts for a screwdriver tip make this easy) and trim any excess. That’s all there is to it.

One last thing: among the downloads you may notice one additional model. That one is provided in split parts, so that one can make a mold of an arbitrary width just by stretching the middle parts as needed, then merging them together. After all, sometimes the STL file is just not quite right and if sharing CAD files is not an option for whatever reason, providing STLs that can be more easily tweaked is a welcome courtesy. You can watch a short video showing how the whole thing works, below.

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Injection Molding With A Hot Glue Gun

June 11, 2019 by Lewin Day 11 Comments

Injection molding is an industrial process used the world over for the quick and economical production of plastic parts. [Nikodem Bartnik] wanted to experiment with this at home, so whipped up some molds and got to work (Youtube link, embedded below).

[Nikodem] produced aluminium molds, using a Dremel-based CNC platform. This allowed for the design to be created in CAD software, and helps with the production of the geometry for both the part, as well as the gates and vents. Having learned about thermal issues with an early attempt, the mold was then clamped in a vice. Wood was used as an insulator to minimise heat lost to the vice.

With this setup, it was possible to mold M5 washers using hot glue, with good surface finish. Later attempts with a larger mold were unsuccessful, due to the glue cooling off before making it through the entire mold. [Nikodem] has resolved to improve his setup, and we look forward to seeing what happens next. We’ve seen others experiment in this area before, too. Video after the break.

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Hot Glue Makes These Segments Glow

January 13, 2019 by Jenny List 14 Comments

It’s safe to say that hot-melt glue is a staple of the projects we see here at Hackaday. There won’t be many readers who don’t have a glue gun, and a blob of the sticky stuff will secure many a project. But it’s not so often we see it used as an integral component for a property other than its stickiness, so [DusteD]’s reaction timer project is interesting for having hot glue as a translucent light guide and diffuser for its LED seven-segment display.

The timer is simple enough, being driven by an Arduino board, while the display is pre-formed into the 3D-printed case. The hot glue fills the enclosures behind each segment, and after several experiments it was found that the best filling method was from behind against a piece of Kapton tape. The LEDs were wired into a common cathode array, and along with the arcade-style button and the Arduino the whole fitted neatly in the box. You can see the result in action in the video below the break.

Of course, this display is unusual for its use of hot glue, but not unique. We’ve seen a different take on a hot glue light pipe display before.

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