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Hardened wood as a renewable alternative to steel and plastic

"Hard materials are in high demand in engineering applications. Widely used hard materials, e.g., alloys and ceramics, are often nonrenewable and expensive. Their production requires high energy consumption and often leads to negative environmental impacts. We demonstrate a potential low-cost and sustainable hard material made from natural wood. Through a simple and effective approach, bulk natural wood can be processed into a hardened wood (HW) with a 23-fold increase in hardness. To demonstrate the potential applications of HW, we show that an HW table knife can be made nearly three times sharper than commercial table knives. An HW nail can be as functional as a steel nail with comparable performance but is immune from rusting, a key failure mechanism of steel nails. These encouraging applications suggest the promise of HW as a renewable and low-cost alternative for conventional hard materials with the potential to replace plastic table utensils and steel nails."

Nanino – the DIY friendly Arduino

"I got a request from a college student in Brazil for a minimalistic Arduino PCB, very similar to a project I worked on a while ago. The requirements were to have a low cost single sided board that was easy to manufacture. It uses wide traces and a minimum of components. Instead of having a USB connection, a 5V FTDI cable is used. The board can be powered by either the FTDI cable or an external power supply (like a 5V USB charger or batteries). See it as what comes between a Veroduino and a Diavolino.

The Texas Instruments HX-1000 Printer/Plotter Photos

The HX-1000 Printer/Plotter attached to the CC-40 with a Hexbus cable and had a passthrough for additional Hexbus devices. The unit utilized an ALPS DPG1302 Print Head assembly. It and other ALPS variants were also utilized by many other brands of printers and plotters of the time. The HX-1000 used four pens and regular calculator paper. Its undoing is a small plastic gear that seems to crack and cause 1) The print head to stop moving, or 2) The paper to stop advancing.

These are various pictures of the innards of a HX-1000, including pictures of the box, the famed gears that break, the ALPS DPG1302 Print Head assembly, and the special pens that the unit used.

Open Source Waste Plastic Granulator

"In order to accelerate deployment of distributed recycling by providing low-cost feed stocks of granulated post-consumer waste plastic, this study analyzes an open source waste plastic granulator system. It is designed, built, and tested for its ability to convert post-consumer waste, 3D printed products and waste into polymer feedstock for recyclebots of fused particle/granule printers. The technical specifications of the device are quantified in terms of power consumption (380 to 404 W for PET and PLA, respectively) and particle size distribution. The open source device can be fabricated for less than $2000 USD in materials. The experimentally measured power use is only a minor contribution to the overall embodied energy of distributed recycling of waste plastic. The resultant plastic particle size distributions were found to be appropriate for use in both recyclebots and direct material extrusion 3D printers. Simple retrofits are shown to reduce sound levels during operation by 4dB-5dB for the vacuum. These results indicate that the open source waste plastic granulator is an appropriate technology for community, library, maker space, fab lab, or small business–based distributed recycling.

RepRapable Recyclebot

"In order to assist researchers explore the full potential of distributed recycling of post-consumer polymer waste, this article describes a recyclebot, which is a waste plastic extruder capable of making commercial quality 3-D printing filament. The device design takes advantage of both the open source hardware methodology and the paradigm developed by the open source self-replicating rapid prototyper (RepRap) 3-D printer community. Specifically, this paper describes the design, fabrication and operation of a RepRapable Recyclebot, which refers to the Recyclebot’s ability to provide the filament needed to largely replicate the parts for the Recyclebot on any type of RepRap 3-D printer. The device costs less than $700 in mate rials and can be fabricated in about 24 h. Filament is produced at 0.4 kg/h using 0.24 kWh/kg with a diameter ±4.6%. Thus, filament can be manufactured from commercial pellets for <22% of commercial filament costs. In addition, it can fabricate recycled waste plastic into filament for 2.5 cents/kg, which is <1000X commercial filament costs. The system can fabricate filament from polymers with extrusion temperatures <250 °C and is thus capable of manufacturing custom filament over a wide range of thermopolymers and composites for material science studies of new materials and recyclability studies, as well as research on novel applications of fused filament based 3-D printing."

Stringent, the $15 Wall Plotter

The cheapest possible minimalistic wall plotter.

Hidden Wireframe Removal
2021/10/04-18:55:38 converts 3D STL files to 2D SVG suitable for #plottertwitter with interactive camera positioning, back-face culling, hidden-line removal, and coplanar-triangle merging.

DIY Mini Laser Engraver

Got a couple of old DVD-RW drives lying around, just collecting dust? Of course you do. If not, you likely know where to find a pair so you can build this totally adorable and fully dangerous laser engraver for your desk. Check out the complete build video after the break.

Hydrogen supply unit

"Hydrogen is generated by heating a metal surface under water to a temperature at which the metal reacts with water to produce hydrogen. The hydrogen can then be used, for example, as a fuel for a motor vehicle engine or another type of engine. The heating can be done electrically by providing an electrical discharge, under water, between the metal surface and another surface. Water and the metal surface are consumed."


The iBoardbot is an ARDUINO robot connected to the internet capable of writing texts and drawing with great precision. Also, it can erase in a quick and effective way. Send to your iBoardbot your information from any part of the world. As it has a multi-user interface you can also play and challenge your kids, use it as a collaborative notice board or as a twitter wall in your store window.

Criado/Created: 2018

Última actualização/Last updated: 21-10-2021 [18:37]

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(c) Tiago Charters de Azevedo