Color by Number 3D Printing Style

Remember paint-by-number kits? Your canvas has outlines with numbered regions that you paint with correspondingly numbered paints. When you are done, you’ve recreated the Mona Lisa. [KurtH3] uses a similar technique to coax multicolor prints from his 3D printer.

The technique isn’t general purpose, but it still is an interesting way to add some color to your usually monochrome prints. The idea is simple: You find a paint-by-number layout (apparently, you can find them with a Google search). Use your favorite method to get the outline into a CAD program. [KurtH3] doesn’t really get into the details about this, but some CAD programs will directly import images. Others will require you to trace in Inkscape (or a similar program) and convert to a vector format like DXF that the 3D CAD program can import.

Here’s the trick: instead of extruding the 2D image as one piece, you extrude the numeric regions to slightly different heights. Say you wanted to print a red, white, and blue flag to a thickness of about 5mm and you use 0.2mm layers. You could extrude the white part to 5mm, for example. Then the red parts could be extruded to 5.2mm (one layer higher) and the blue parts to 5.4mm. You could extend the idea to do multiple layers, although that will increase the surface roughness.

[KurtH3] pauses the print at the end of the layers to change filament, but we would probably edit the sliced G-Code to put pauses in the right places (for example, Repetier Host lets you put @pause in your file). You could also use software to split the G-Code as we’ve previously covered.  The resulting print, using our example, would be white from the bottom up but would have thin red and blue layers over the top in the right places. The few hundred microns difference from the white surface to the other colors means you won’t get a perfectly smooth surface, but a few hundred microns shouldn’t be too noticeable.

Continue reading “Color by Number 3D Printing Style”

3D Printed Vice Holds Dev Boards Beside Breadboard

The Stickvise has been a staple of the Hackaday community for a while now. If you need something held for soldering there’s no better low-cost helping hand. But if you’re just using a breadboard and a dev board of some sort, there’s another vice on the horizon that uses similar spring clamping to hold everything in place while you build something awesome.

BreadboardVise1-croppedWhile [Pat]’s inspiration came from the aforementioned Stickvise, the new 3d-printed vice is just what you’ll need before you’re ready to do the soldering. The vice is spring-loaded using rubber bands. The base is sized to fit a standard breadboard in the center with clamping arms on either side to hold dev boards such as an Arduino. This innovative yet simple de”vice” grips boards well enough that you won’t be chasing them around your desk, knocking wires out of place, anymore.

There are some nuances to this board, so be sure to check out the video below to see it in action. As we mentioned, it uses rubber bands instead of springs to keep it simple, and it has some shapes that are easily 3d printed such as the triangular rails. If you want to 3d print your own, the files you’ll need are available on the project’s site. If you want to get even simpler, we’ve seen a few other vices around here as well.

The Stickvise is available for sale in the Hackaday Store.

Continue reading “3D Printed Vice Holds Dev Boards Beside Breadboard”

NES Reborn as Nexus Player and NES

Anyone who has a Raspberry Pi and an old Nintendo has had the same thought. “Maybe I could shove the Pi in here?” This ran through [Adam’s] head, but instead of doing the same old Raspberry Pi build he decided to put a Nexus Player inside of this old video game console, with great success. Not only does it bring the power of a modern media player, it still works as an NES.

If you haven’t seen the Nexus Player yet, it’s Google’s venture into the low-cost home media center craze. It has some of the same features of the original Chromecast, but runs Android and is generally much more powerful. Knowing this, [Adam] realized it would surpass the capabilities of the Pi and would even be able to run NES emulators.

[Adam] went a little beyond a simple case mod. He used a custom PCB and an Arduino Pro Micro to interface the original controllers to the Nexus Player. 3D printed brackets make sure everything fits inside the NES case perfectly, rather than using zip ties and hot glue. He then details how to install all of the peripherals and how to set up the Player to run your favorite game ROMs. The end result is exceptionally professional, and brings to mind some other classic case mods we’ve seen before.

3D Printing Helps Rekindle Old Love with an Uncommon Truck 

People may know many name and brands of cars and trucks, and there’s tons of scale models available for the average popular ones. What happens if your favorite truck is a 1960 Bucegi? You could do what [Arin] did and 3D print your own custom model.

[Arin] used to drive these machine back in his youth and it made an impression on him. In the few years of production, the 140HP V8 truck was adapted to all sorts of uses from farm trucks to military vehicles and even cranes.  The base truck and the desired configuration is modeled up in quite a bit of detail, then it’s 3D printed.

Once the printing is done the models are smoothed out using body filling primer paint, (and we imagine some fine sanding) , painted with acrylic paint, and assembled into an accurate model complete with working steering systems.

Below is a video showing assembly and painting and a second video showing off the steering system.

Continue reading “3D Printing Helps Rekindle Old Love with an Uncommon Truck “

Better 3D Prints by Mixing Slicing Techniques

Most 3D printing projects start with a 3D model of some kind. Slicing programs transform the model into gcode. The gcode file contains the commands that actually drive your printer. There are different ways to slice a model and sometimes you want to use more than one on a single model. I’ve been working on a way to make that easier.

When you slice a 3D printing model, you can select different attributes for the resulting gcode file. For example, you might set the slicer to produce different infill density, temperatures, or print speeds. These settings can have a big impact on your printing results. For example, a piece that needs high strength might require a denser infill  than some trinket or key chain. You might want an artistic piece to have a finer layer height than some internal part for some gadget no one will ever see.

One Size Fits All?

The problem is that for most open source slicers, these settings will apply to the entire model. Cura has some plugins that can change settings at different Z heights, and Slic3r can vary layer height, but in the general case, what you set for the slicer will apply to the entire model. Of course, a gcode file is nothing more than a text file, so if you are industrious, you can manually merge two or more files into one.

A manual merge is a pain, which is why I wrote gblend. It can stitch together gcode files to get various effects. The program takes multiple gcode files in as inputs and can combine them in different ways. The most useful feature allows you to get a certain number of layers from each source file and combine them into a single print. Measurements are in millimeters, so you don’t have to worry about layer numbers. The entire process is much easier than anything else I’ve come across.

Continue reading “Better 3D Prints by Mixing Slicing Techniques”

Maker Faire Kansas City: That’s A Wrap

The 5th annual Kansas City Maker Faire was as fun as ever, but it definitely felt different from previous years. There seemed to be an unofficial emphasis on crafts this year, and I mean this in the broadest sense of the word. There was more exposure for the event in the local media, and this attracted a wider variety of faire-goers. But the exposure also brought more corporate sponsorship. This wasn’t an exclusively bad thing, though. For instance, several people from Kansas City-based construction firm JE Dunn were guiding mini makers through a birdhouse build.

Many of the this year’s booths were focused on a particular handicraft.  A local music shop that makes custom brass and woodwind instruments had material from various stages of the building process on display. Several tables away, a man sat making chainmaille bags. At one booth, a girl was teaching people how to fold origami cranes. Several makers had various geek culture accessories for sale, like a shoulder bag made from a vintage Voltron sweatshirt. The guys from SeeMeCNC made the 12-hour drive with the Part Daddy, their 17-foot tall delta printer. They printed up a cool one-piece chair on Saturday, then made a child-sized version of it on Sunday.

The entire lower level of the venue was devoted to a series of exhibits related to the film and television industry. Collectively, they covered the entire production process from the casting call to the red carpet. Several local prop and costume makers were showing off their fantastic creations, including [Steven] of SKS Props. He started making video game props for fun a few years ago. These days, his work adorns the offices of some of those same game companies.

Of course, there was plenty to see and do outside, too. All the kids playing human foosball were having a blast. LARPers larped next to lowriders and food trucks, power wheels raced, and a good time was had by all.

3D Printing Binaural Microphones

Binaural audio is probably the coolest thing you can listen to with a pair of headphones. Instead of just a single microphone, binaural recordings use two microphones, set inside an analog for a human head, to replicate exactly what you would hear if you were there.

The only way to record binaural audio is with fake plastic ears attached to a dummy head. Most of the famous microphone manufacturers have something like this, but with a 3D printer, anything is possible. [Carlos] created his own binaural microphone using a 3D printer and went through the trouble of creating a few audio demos. The results are weird, like [Carlos] is whispering into your ear.

The ears used in this microphone setup are taken from a Thingiverse project by [Jonathan March]. This model did not properly model the ear canal,and didn’t have any way to mask the sound from ear to ear; this is why the professional models also include a head. [Carlos] fixed these shortcomings and created a few 3D models that accurately model the human ear and head.

There’s also a simple stereo microphone amplifier for this project that is designed to fit right between the ears. This amplifier was designed in KiCAD, and the PCB is single sided. It’s not quite simple enough to assemble on a piece of stripboard, but [Carlos] did manage to manufacture it on some copper clad board in his mill.

The results? It sounds awesome. [Carlos] put together a demo of his microphone, link below, and it only works if you’re wearing headphones.

Continue reading “3D Printing Binaural Microphones”