All posts by João Duarte

One of the founders of eLab Hackerspace! Post-Graduate with a Specialization in Electrical and Electronics Engineering. Some of his interests include digital fabrication, home automation, robotics, high voltage and chemistry.

GearBest Decaker Micro Laser Engraver Review

A few months ago I received this Decaker Micro Laser Engraver from GearBest and finally I’ve had some time to do the review. This will be a short overview, since you can read my full review here. Starting with the basics, this has a 1000mW laser head and a engraving area of just 38×38 mm. It works on paper, card, wood, plastic and leather, as long as it’s not a reflective material.

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DIY Metal Melting Furnace

The world is always evolving fast and new technologies emerging, like metal 3D printing, but sometimes it just feels good to do things the “old” way. Don’t get me wrong, I love technology but still is great to learn old techniques specially when they tend to disappear when less and less people actually care to learn them and the craft becomes closer to extinction. Not that this is the case, although a few foundries have been closing over the last years. Be that an excuse or not, Gonçalo and me decided to build a simple DIY furnace, not only for the reasons above but we’re crazy about forging and metal working, and we would love to create some amazing metal pieces. Besides this is a dangerous project, what more do I need to say?!!

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Jacob’s Ladder

This is a quick and simple project that is a bit old but still always a delight to see. Who doesn’t love staring at those high voltage sparks moving upwards again and again on the background of a mad scientist’s laboratory?  Since we have a few high voltage transformers around here, I thought I could make a Jacob’s Ladder as a last minute project to add to the ones that would be presented on the Open Day.

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UAlg Open Day 2016

Last Thursday, the University of the Algarve organized once more its annual open day, where it showcases their curricular offers to young students from all over the regional high schools. The  Electrical Engineering Department asked us to be a part of the event and to prepare a small demonstration of our own projects to help motivate and inspire these young minds.

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Think3DPrint3D Kossel Mini Kit: Unboxing, Review & Upgrade

A few months ago we got the amazing news that our project 3D Printed DNA Lamp was one of the winners of the instructables 3D printing contest! As a reward we received the Kossel Mini Kit 3D printer, so here’s the unboxing, review and … upgrade? (I’ll explain later :P)

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Logic Pirate 3D Printed Case

We recently got our hands on the Dangerous Prototypes Logic Pirate, which is an inexpensive open source logic analyzer. While it’s cool to see the PCB and the entire circuitry, this is the kind of thing that you’re gonna end up carrying it with you a lot, since it’s a useful tool, therefore our first thought was that it needed a proper enclosure to protect it from the rough environment that is the tool kit! And, since we have a LulzBot 3D printer, why not design a cool looking case that we can use.

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Ion Thruster

An ion thruster is a type of electrical propulsion system used for spacecraft propulsion capable of creating thrust by accelerating ions.  Back in June 2015, I remember seeing this demonstration for the first time on Makezine, by . I thought it was amazing for its scientific value and at the same time quite easy to build, so me and Hugo thought we could make our own version of it, using 3D printed parts.

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Geodesic Dome

A few weeks before Lisbon Maker Faire we were discussing about the projects we would present this year. We wanted to take there something big, something different, and then it came to us, what about a geodesic dome? As we were working on the SatNOGS project, which we will post soon, we came across the domes for protecting the antennas, basically a radome. It started out as a crazy idea, but eventually we thought it was simple enough for us to do it in a short amount of time, using 3D printed connectors and PVC pipes and clamps. Sponsored by Grupo Rolear!

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3D Printed DNA Lamp

This is a project I have made for the Instructables 3D Printing Contest. I was browsing online for some 3D designs when I found a DNA strand, and I noticed that when I rotated it, it created a weird hypnotising upwards and downwards effect, so I thought it would be cool to take advantage of that effect and use it on something, then came the idea of making a lamp. This will be a small summary, since  the full article can be found on Instructables. And STLs can be found on My Mini Factory.

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