3d printing

862 Articles

Finishing FDM Prints With SLS Resin

December 25, 2019 by 17 Comments

[Thomas Sanladerer] has a filament-based 3D printer and a resin one. Can the two types of raw material combine to make something better? [Thomas] did some experiments using some magnets to suspend the parts and a hot air soldering gun to heat things up.

The trick turns out to be cutting the resin with alcohol. Of course, you also need to use a UV light for curing.

The parts looked pretty good, although he did get different results depending on a few factors. To see how it would work on a practical part, he took a very large printed alien egg. The problem is, the egg won’t fit in the curing station. A few minutes with a heat sink, a drill press, and an LED module was all it took to build a handheld UV curing light.

The good news is you don’t need a resin printer to take advantage of the process — just the resin. He also points out that if you had parts which needed to maintain their dimensions because they mate with something else, you could easily mask the part to keep the resin away from those areas.

If this video (and the results it shows) has you interested, then you’ll love the in-depth account that [Donald Papp] wrote up last year about his own attempts to smooth 3D printed parts with UV resin.

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Annealing 3D Prints: A Scientific Approach

December 18, 2019 by 28 Comments

We’ve all been taught the scientific method: Form a hypothesis, do some experiments, gather some data, and prove or disprove the hypothesis. But we don’t always do it. We will tweak our 3D prints a little bit and think we see an improvement (or not) and draw some conclusions without a lot of data. Not [Josef Prusa], though. His team printed 856 different parts from four different materials to generate data about how parts behaved when annealed. There’s a video to watch, below.

Annealing is the process of heating a part to cause its structure to reorganize. Of course, heated plastic has an annoying habit of deforming. However, it can also make the parts firmer and with less inner tension. Printed parts tend to have an amorphous molecular structure. That is to say, they have no organization at all. The temperature where the plastic becomes soft and able to reorganize is the glass transition temperature.

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3D Print Your Way To A Glass Cockpit Simulator

December 14, 2019 by 9 Comments

Today’s commercial aircraft are packed to the elevators with sensors, computers, and miles and miles of wiring. Inside the cockpit you’re more than likely to see banks of LCDs and push buttons than analog gauges. So what’s that mean for the intrepid home simulator builder? Modern problems require modern solutions, and this 3D printed simulator is about as modern as it gets.

Published to Thingiverse by the aptly named [FlightSimMaker], this project consists of a dizzying number of 3D-printed components that combine into a full-featured desktop simulator for the Garmin G1000 avionics system. Everything from the parking brake lever to the push buttons in the display bezels was designed and printed: over 200 individual parts in all. Everything in this X-Plane 11 compatible simulator is controlled by an Arduino Mega 2560 with the SimVim firmware.

To help with connecting dozens of buttons, toggle switches, and rotary encoders to the Arduino, [FlightSimMaker] uses five CD74HC4067 16-channel multiplexers. The display is a 12.1 inch 1024 x 768 LCD panel with integrated driver, and comes in at the second most expensive part of the build behind the rotary encoders. All told, the estimated cost per display is around $250 USD.

Even if you aren’t looking to build yourself a high-tech flight simulator, there’s plenty of ideas and tips here that could be useful for building front panels. We particularly like the technique used for doing 3D-printed lettering: the part is printed in white, spray painted a darker color, and then the paint is sanded off the faces of the letters to reveal the plastic. Even with a standard 0.4 mm nozzle, this results in clean high-contrast labels on the panel with minimal fuss.

Of course, while impressive, these panels are just the beginning. There’s still plenty more work to do if you want to build an immersive simulation experience. Including, in the most extreme cases, buying a Boeing 737 cockpit.

Bring The Smithsonian Home With 3D Printing

December 9, 2019 by 1 Comment

If you’ve ever been to Washington DC, you know the Smithsonian isn’t just a building, instead it’s a collection of 19 museums, 21 libraries, 9 research centers, and a zoo. Even though there are hundreds of affiliated museums, there is a way to bring at least some of the museum to you. The Smithsonian has a 3D digitization portal that currently features 124 models of items from the collection. Almost 100 of them have models you can download and print — or have someone print for you.

Printing yourself is probably the most cost-effective option if you already have a printer. According to the Smithsonian, if you want a 1/20th scale model of a T. Rex cranium, Shapeways will do it for about $21. If you want a 9-inch version of Neil Armstrong’s spacesuit, that would go for $130 or so.

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Testing Carbon Fibre Reinforced Filament By Building An Over-Engineered Skateboard

December 3, 2019 by 4 Comments

Advances in filaments for FDM 3D printers have come in leaps and bounds over the past few years, and carbon fibre (CF) reinforced filament is becoming a common sight. Robotics extraordinaire [James Bruton] got his hands on some CF reinforced PLA, and ended up building a completely over-engineered 3D printed skateboard. (Video, embedded below.)

[James] started by printing some test pieces with a 0.5 mm and a big 1.2 mm nozzle with and without the CF, which he subjected to cantilever deflection tests. The piece with CF was 20% stiffer than without.

[James] then built an extremely strong and cool looking skateboard deck with alternating section of the CF PLA and toughened PLA, totalling 2.7 kg of filament. It was extremely strong, so after bolting on a set of trucks and wheels, he did some mild riding at a local skate park, where it survived without any problems. He admits it was completely over-engineered, but points out in that the internal cavities in the deck is the perfect place for batteries on an electric long board.

Designing something from the ground up with the strength and weaknesses 3D printing in mind, leads to some very interesting and innovative designs, of which this is a perfect example, and we hope to see many more like it. We’ve featured a number of [James]’ project, including the remote controlled bowling ball he built for [Mark Rober] and his impressive OpenDog and Start Wars robots.

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Manual Mesh Bed Levelling For 3D Printers

December 1, 2019 by 18 Comments

In 3D printing, we often talk about leveling the print bed, although that’s not an accurate term. A bed that is level in our terms presents a flat surface that is parallel to the path of the print head, but within reason we care little about that. Instead we care more about it being parallel to the path of the head than it being perfectly flat. If we had a perfectly flat bed — say a sheet of glass — you’d think it might be pretty easy, but for some other materials it could be convex or concave or even have ripples all over the place. [Teaching Tech] shows you how to manually “level” the bed using a mesh but without using an automatic sensor. You can see the technique in the video below.

When you use adjustments to level the bed, you are tramming it, but only the very pedantic use that term for fine adjustment. But no amount of adjusting bed springs will get rid of bulges and ripples. A common solution is to use a sensor to measure the distance to the bed and form a mesh correction. Then, as the printer head moves in the XY plane, the software will adjust the Z-axis to rise over bumps and go down if there is a concave portion of the bed. What [Teaching Tech] is doing, however, is a manual mapping. You won’t need to add a sensor to your printer to take advantage of the method. 

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Multi Material 3D Printing Makes Soft Robot

November 30, 2019 by 8 Comments

When you zoom in on a fractal you find it is made of more fractals. Perhaps that helped inspire the Harvard 3D printers that have various arrays of mixing nozzles. In the video below you can see some of the interesting things you can do with an array of mixing nozzles. The coolest, we think, is a little multi-legged robot that uses vacuum to ambulate across the bench. The paper, however, is behind a paywall.

There are really two ideas here. Mixing nozzles are nothing new. Usually, you use them to mimic a printer with two hot ends. That is, you print one material at a time and purge the old filament out when switching to the new filament. This is often simpler than using two heads because with a two head arrangement, both the heads have to be at the same height, you must know the precise offset between the heads, and you generally lose some print space since the right head can’t cross the left head and vice versa. Add more heads, and you multiply those problems. We’ve also seen mixing nozzles provide different colors.

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