3D printed buildings

3D_printed_houseThe idea of building houses using massive 3D printers is nothing new…but it hasn’t moved beyond the idea stage…until now.  In China, the WinSun Decoration Design Engineering company has developed a machine to print ten sample structures, each about 200 square meters in size (they didn’t invent the machine, but are the first to really do something on this scale).  The printer extrudes a concrete-like material to build up the walls layer by layer; printing the sloped roof is possible if the house is done in slices that are then rotated up into position (or you can print the walls in their normal orientation, and add a roof using other construction methods).  The video below shows the process well.  I’d be curious in seeing an environmental comparison of this process versus traditional wood frame houses – concrete is not eco-friendly, but it does have the potential to last much longer.

3D printing with Graphene?

Graphene, a one-atom thick sheet of carbon atoms, is truly a ‘super material’, though one that’s still mostly existing only in labs and not everyday life.  Yet.  American Graphite Technologies is working on extrudable graphene which could then be used in 3D printers to enable new manufacturing possibilities for this fantastic material.  Just how good is it?  Well it conducts electricity well, conducts head extremely well, and is 200 times stronger than steel.  It’s also virtually transparent.  Pretty cool stuff, and regardless of whether they pull off this 3D printing, expect this material to become a part of your life soon.

(via Inhabitat)

3D Printed Gun stirs up controversy…and idiocy

Not surprisingly, people are freaking out about the 3D Printed Gun design that was released a few days ago.  The US State Department sent a cease and desist letter to the person who posted the plans online, demanding that they be removed.  He complied (though has hired a lawyer to fight this), but to even make such a request shows incredible ignorance of the information age we live in.  The plans were downloaded around one million times and are available elsewhere online.  Governments cannot suppress information…to attempt to do so is futile.   Lawmakers in California and other areas of the country are trying to ban 3D printed gun technology.  Meanwhile, efforts to implement mandatory background checks for gun purchases have failed in Congress.  So, you can’t print your own single-shot gun that might explode in your hands when you try to use it and at has horrible accuracy, but it’s OK to go buy an AR-15 with high capacity magazine, armor piecing rounds, and body armor.  Does anyone else see the lunacy in this?

3D printed gun

liberator-pistol-3d-printed-parts-640x440With all the advances in 3D printing, it was inevitable that someone, someday, would create a 3D printed gun…and that day is here.  The only non-plastic parts are the firing pin, and the bullet.  Everything else is plastic, printed on a Stratasys Dimension SST 3D printer in ABS…a step above the hobbyist grade 3D printers like the Cube.

As far as firearms go, this one is pretty crude – it’s a single shot device which must be manually loaded, and a test with a larger caliber bullet resulted in destruction of the gun (the successful test used a .380 caliber round).

So, this is very much an immature product, but represents a huge milestone for the technology.  There are those who believe that our species can create amazing technology and regulate it to the point where it is safe for society, but the reality is that technology can be used for both good and bad, and attempts to regulate that are eventually futile.

If you want to download the models yourself, head to DefCAD.  I wouldn’t recommend it though…this is a marginal design and really more of a proof of concept…be careful.  Note that in the test firings, a string was used to actuate the trigger.

Read more at ExtremeTech.

Part Design for 3D Printing on a Cube

bracket_originalI’ve been really enjoying my Cube printer, but it has not been without its learning curve.  Like any part design, you need to design the part with the manufacturing process in mind, and I’m learning quite a bit about extruded filament part production.

One issue is that large parts with thick sections tend to warp.  The Cube software provides an option for a raft – basically a lattice of thin lines laid down first, providing a stable bed upon which to build the part – but this greatly increases the post-processing time.  Namely, you need to scrape or sand off the raft.  It’s not a huge deal but does waste material and time.

Consider the bracket design shown above.  It’s simple enough, with a uniform cross section and was designed to be printable without needing supports (thin webs of material to support overhangs and such).  However, when printing, this part would warp and curl, forcing me to abort the print.

To address this, I did a few things.  First, I added thin tabs at the corners to help hold those down.  The principle is similar to the raft, but much easier to clean up (just cut them off – very quick and clean).  This alone did not produce a repeatable, printable part.  So, I added large chamfers at all edges, to reduce the part thickness and reduce warping.  This did the trick, and I was able to repeatedly print this (I’m using ABS, for what it’s worth).  Here’s what the final design looks like:

bracket_mod

As I learn more, I’m just not seeing how this technology is ready for mainstream home use like some articles seem to suggest.  You need to be a tinkerer and know your way around CAD to get parts that are really going to do what you want.  For that type of person though, this printer is fantastic!  I’ve been able to iterate prototype parts much quicker than before and am producing better designs, faster.

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