3D Printing On A Spinning Rod

FDM 3D printing traditionally operates on a layer-by-layer basis, using a flat bed to construct parts. However, [Humphrey Wittingtonsworth IV] demonstrates in his video how this process can be significantly enhanced in terms of mechanical strength and print speed by experimenting with printing on a rotating rod instead of the standard flat bed.

[Humphrey] modified a Creality CR-10 3D printer by removing the bed and installing a regular 8mm linear rod under the hotend. The rod is rotated by a stepper motor with a 3:1 belt drive. This lets him use the rod as the printing surface, laying down layers axially along the length of an object. This means parts that can stand up to bending forces much better than their upright-printed counterparts.

Additionally, this rotational action allows for printing functional coil and wave springs – even multi-layer ones – something that’s not exactly feasible with your run-of-the-mill printer. It can also create super smooth and precise threads as the print head follows their path. As an added bonus – it could also speed up your printing process as you’re just spinning a slim rod instead of slinging around an entire bed. So cylindrical parts like tubes and discs could be printed almost as quickly as your hotend can melt filament.

Of course, this approach isn’t without its challenges. It works best for cylindrical components and there’s a limit to how small you can go with inner diameters based on your chosen rod size. Then there’s also the task of freeing your prints from their rod once they’re finished. [Humphrey] addressed this by creating mesh sleeves that snugly fit over his center rod. This limits how much melted plastic can adhere to it, making removal a breeze.

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High temperature 3D printer

Extreme Thermal Mods For 3D Printing Exotic Materials

For general everyday use, there’s nothing wrong with the standard selection of plastics that most 3D printer filaments are available in. PLA, ABS, PETG — they’ve all got their place, and they’re all pretty easy to work with. But if you need to work with more exotic materials, you might need to go to extremes and modify an off-the-shelf printer for high-temperature work.

For the team led by [Andreas Hagerup Birkelid] at the Norwegian University of Science and Technology, the standard menu of printer chow wasn’t up to the jobs they had in mind. They wanted to print using polyether ether ketone, or PEEK, a high-performance thermoplastic with useful mechanical and thermal properties, in addition to chemical resistance. Trouble is, the melting point of PEEK is a whopping 343°C (649°F), making it necessary to turn up the heat — a lot. A standard Creality CR-10 printer was upgraded to withstand not only the 500°C max temperature of the new hot end and 200° printed bed, but also to survive operating in what amounts to an oven — a balmy 135° in a chamber made from IKEA cabinets. That entailed replacing plastic parts with metal ones, upgrading belts, pulleys, and wires, and moving all the electronics outside the enclosure. Even the steppers got special treatment, with water cooling to keep their magnets from reaching the Curie point.

The mods seemed to do the trick, because a Benchy printed in a carbon-fiber PEEK filament came out pretty good. It seems like a long way to go and kind of pricey — $1,700 for the printer and all the mods — but if you have a need to print exotic materials, it’s way cheaper than a commercial high-temp printer.

[via 3D Printing Industry]

Knock Your 3D Printer Down To 2D

Hackers love 3D printers. In fact, they might love them a little too much. We hope know we aren’t be the only ones who couldn’t turn down a good deal on an overseas printer (or two). But when you’re not pumping out plastic boats and other PLA dust collectors, what are you supposed to do with them?

Well if you’re like [Uri Shaked] you could hand them a pen and tell them to get writing. The holidays are coming up quick, and somebody’s gotta sign all these cards. In his detailed write-up, he shows how he was able to add a pen to his Creality CR-10 printer to turn it into a lean mean letter-writing machine without making any permanent changes to the printer.

The physical aspect of this hack is about as simple as they come: just come up with some way to hold the pen a bit below the printer’s hotend. The positioning here is a bit critical, as you don’t want to crash the nozzle into the bed while writing out a missive. [Uri] got fancy and designed a little bracket that clamps onto the CR-10 and even has a M3 screw to hold the pen in place, but you could get away with zip ties if you just want to experiment a bit.

[Uri] goes into much greater detail on the software side of things, which is good, as it does take a bit of Inkscape trickery to get the printer to perform the specific dance moves required. He goes through step by step (with screen shots) explaining how to set up Orientation Points and configure the tool parameters for optimal performance. Even if you aren’t looking to put a 3D printer to work autographing your 8x10s before the next hackerspace meet, this is an excellent guide on producing GCode with Inkscape which can be helpful for tasks such as making PCBs.

The general process here is very similar to adding a laser module to your 3D printer, but with considerably lower risk of your eyeballs doing their best Death Star impression.

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GPL Violations Cost Creality A US Distributor

One of the core tenets of free and open source software licenses is that you’re being provided source code for a project with the hope that you’ll “pay it forward” if and when you utilize that code. In fact some licenses, such as the GNU Public License (GPL), require that you keep the source code for subsequent spin-offs or forks open. These are known as viral licenses, and the hope is that they will help spread the use of open source as derivative works can’t turn around and refuse to release their source code.

Unfortunately, not everyone plays by the rules. In a recent post on their blog, Printed Solid has announced they are ending their relationship with Chinese manufacturer Creality, best known for their popular CR-10 printer. Creality produces a number of printers which make use of Marlin, a GPLv3 licensed firmware that runs (in some form or another) a large majority of desktop 3D printers. But as explained in the blog post, Printed Solid has grown tired with the manufacturer’s back and forth promises to comply with the viral aspects of the GPL license.

Rather than helping to support a company they believe is violating the trust of the open source community, they have decided to mark down their existing stock of Creality printers to the point they will be selling them at a loss until they run out. In addition, for each Creality printer that is sold Printed Solid has promised to make a $50 USD donation to the development of Marlin saying: “if Creality won’t support Marlin development then we will.”

As is often the case when tempers are high and agreements break down, Printed Solid has also pulled back the curtain a bit as to the relationship they have had thus far with the manufacturer. According to the blog post, Printed Solid claims that some models of Creality printers have had a 100% fault rate, and that the company needed to repair and tweak the machines before sending them out to customers. The not so subtle implication being that Creality printers have been benefiting from the work Printed Solid has been doing on their hardware, and that purchasing a unit direct from the manufacturer could be a dicey proposition.

We’ve previously covered an issue with Creality’s CR-10S printer that required the end-user to replace an SMD capacitor just to get reliable results out of the machine, and of course we’ve talked of the extra work that’s often required when wrangling a low-end Chinese printer. It’s even more disheartening when you realize cheap machines sold by shady manufacturers are pushing open source manufacturers out of business.