Makerpipe Turns Conduit Into Structures

At the risk of stating the obvious, building big things can be difficult. Sure, parts that fit on the bed of a 3D printer are easy to make, if not particularly fast, and scaling up from there is possible. But if you need a long beam or structural element, printing makes little sense; better to buy than build in that case. The trouble then becomes, how do you attach such parts together?

Enter Makerpipe. This South Carolina company, recently out of a crowdfunding campaign, makes a range of structural connectors and fittings for electrical mechanical tubing, or EMT, the galvanized steel conduit used in the electrical trades. EMT is widely available in multiple sizes and is relatively cheap, although we have noticed that the price here has ticked up quite a bit over the last couple of years. It also has the advantage of being available off-the-shelf at any big-box home improvement store, meaning you have instant access to a fantastic building material.

Makerpipe’s bolt-together couplings let you turn pieces of EMT, easily cut with a hacksaw or pipe cutter, into structures without the need for welding. Yes, you can do the same with extruded aluminum, but even if you’re lucky enough to live near a supply house that carries extrusions and the necessary fittings and is open on Saturday afternoon, you’ll probably pay through the nose for it.

Makerpipe isn’t giving their stuff away, and while we normally don’t like to feature strictly commercial products, something that makes building large structures easier and faster seems worth sharing with our community. We’ve done our share of fabricobbling together EMT structures after all, and would have killed for fittings like these.

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Open Source DIY Printers Are Alive And Well: What We Saw At ERRF 18

If you follow the desktop 3D printer market, it probably won’t surprise you to hear that nearly every 3D printer on display at the inaugural East Coast RepRap Festival (ERRF) was made in China. Even Printrbot CEO Brook Drumm had to admit that this was the year his company may finally bite the bullet and begin selling a branded and customized printer built overseas.

When you can get a decent (but let’s be clear, not great) 3D printer for $200 USD, it’s no surprise that American and European manufacturers are having a hard time staying competitive. But not everyone is seduced by low-cost printers. They know they could buy a decent printer for a couple hundred bucks, but for them that’s not the point. Some hackers are just as (if not more) interested in designing and building the machines than they are churning out little plastic boats with the finished product.

Luckily for us, these are also the type of folks who document their builds and make all their collected information and design files available for others under an open source license. Such builders exemplify the true spirit of the RepRap movement, and we’re happy to report that in a sea of imported printers, there were several interesting home built open source printers.

Whether you want to build your own copy of one of these machines, or simply get inspired by some of the ideas their creators had, these machines are physical proof that just because you can order a cheap 3D printer on eBay right now doesn’t mean you have to.

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Little Laser Light Show Is Cleverly Packaged, Cheap To Build

We’re suckers for any project that’s nicely packaged, but an added bonus is when most of the components can be sourced cheaply and locally. Such is the case for this little laser light show, housed in electrical boxes from the local home center and built with stuff you probably have in your junk bin.

When we first came across [replayreb]’s write-up and saw that he used hard drives in its construction, we assumed he used head galvanometers to drive the mirrors. As it turns out, he used that approach in an earlier project, but this time around, the hard drive only donated its platters for use as low mass, first surface mirrors. And rather than driving the mirrors with galvos, he chose plain old brushed DC motors. These have the significant advantage of being cheap and a perfect fit for 3/4″ EMT set-screw connectors, designed to connect thin-wall conduit, also known as electromechanical tubing, to electrical boxes and panels. The motors are mounted to the back and side of the box so their axes are 90° from each other, and the mirrors are constrained by small cable ties and set at 45°. The motors are driven directly by the left and right channels of a small audio amp, wiggling enough to create a decent light show from the laser module.

We especially like the fact that these boxes are cheap enough that you can build three with different color lasers. In that case, an obvious next step would be bandpass filters to split the signal into bass, midrange, and treble for that retro-modern light organ effect. Or maybe figuring out what audio signals you’d need to make this box into a laser sky display would be a good idea too.

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