3D Printering: Making A Thing In Autodesk 123D


In the continuing battle against 3D printers used exclusively for fabricating plastic octopodes and useless trinkets, here’s yet another installment of a Making A Thing tutorial. If you’ve ever wanted to make one single object in multiple 3D design softwares, this is for you.

Previously, we’ve built a ‘thing’ in a few different 3D modeling programs, including:

See that ‘Read more…’ link below? You might want to click that.

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3D printed arc reactor replica


[James] just keeps cranking on the idea of the perfect arc reactor replica. This time around he’s made most of the parts using a 3D printer. His write-up covers the basics of the build, but he also used this opportunity to make some tutorial videos on designing the parts using Autodesk 123D.

This is definitely an improvement on his last prop, which was built out of dollar store parts. When designing the components he tried to be as true to the original movie design as possible, while keeping in mind the limitations of using a home 3D printer; he printed them on a Lolzbot AO-101.

The videos below give you a good idea of what it’s like to model parts using 123D. The tool set is pretty simple compared to something like Blender 3D. But [James] uses them in such a way that the components get complex fairly quickly. The second video includes some footage of the parts being printed, as well as the assembly process that adds wrapped wire for looks, and LEDs for illumination.

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Repairing broken injection molded parts with a 3D printer


The value of a 3D printer is obvious for people who hack hardware as a hobby. But this repair project should drive home their usefulness for the commoner. [James Bruton] used a 3D printer to recreate a hopelessly broken injection molded plastic part. This is a suction cup mounting bracket for a Tom Tom GPS module. The sphere which makes it adjustable had broken off of the column holding it. For 100% of non-hacking consumers that’s the end of this item. We can’t see a fix that would restore the strength of the original part.

The replacement starts by measuring the broken part with precision calipers. [James] then grabbed a copy of 123D, which is free software. He starts by modeling the sphere, then builds up the support column and the base with a cut-out. It’s obvious he’s already very familiar with the software, but even the uninitiated should be able to get this done pretty quickly. After slicing the design for the 3D printer he finds the part will be ready in about 11 minutes. The first prototype is a bit too small (the ball requires close tolerances to work well). He spins up a second version which is a bit large and uneven. A few minutes of filing leaves him with a smooth sphere which replaces the original part beautifully!

You can see the entire design, print, and assembly process in the clip after the break.

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Revolving camera mount helps to capture 3D video-game assests


Here’s a camera rig that makes it a snap to produce photorealistic 3D models of an object. It was put together rather inexpensively by an indie game company called Skull Theatre. They published a couple of posts which show off how the rig was built and how it’s used to capture the models.

They’re using 123D, a software suite which is quite popular for digitizing items. The rig has a center table where an object is placed, and a movable jig which holds three different cameras (or one camera for three rotations). You can see the masking tape on the floor which marks the location for each shot. These positions are mapped out in the software so that it has an easy time putting them all together. The shaft which connects the jig to the base is adjustable to accommodate large or small items.

One thing that we found interesting is the team’s technique for dealing with reflections. They use a matte spray to make those surfaces less reflective. This helps 123D do its job but also allows them to map reflective surface more accurately using the game engine.

Your face in chocolate

We think in might be absurdly vain, but wouldn’t it be fun to give everyone in your family a chocolate modeled after your mug this holiday season? [Eok.gnah] has already worked out a system to make this possible. It consists of three parts: scanning your head and building a 3D model from it, using that model to print a mold, and molding the chocolate itself.

He used 123D to scan his face. No mention of hardware but this face scanning rig would be perfect for it. He then cleaned up the input and used it to make a mold model by subtracting his face from a cube in OpenSCAD. That needs to be sliced into layers for the 3D printer, and he used the Slic3r program which has been gaining popularity. Finally the mold was printed and the face was cast with molten chocolate. We’d suggest using a random orbital sander (without sand paper) to vibrate the bottom of the mold. This would have helped to evacuate the bubble that messed up his nose.

You know, it doesn’t have to be your face. It could be another body part, even an internal one… like your brain!

Autodesk enters the hobby market

Autodesk aims to enter the hobby market with its offering of Autodesk 123d. If you’ve ever been spoiled by a nice CAD suite like Solidworks, Pro-E, or Inventor it becomes readily apparent that the free offerings don’t come anywhere close. At first Autodesk 123d seems to be entirely a Google Sketchup clone, and in some ways it is. Though, after a bit more exploring, the software offers some pretty advanced features, such as assemblies and constraints . All worries about it being windows only and closed source aside, it’s pretty cool that a big name in the CAD industry is taking a look at the hobby market, and overall it is worth testing out to see if it fits into your toolbox.
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