Reinforcing Plastic Polymers With Cellulose And Other Natural Fibers

While plastics are very useful on their own, they can be much stronger when reinforced and mixed with a range of fibers. Not surprisingly, this includes the thermoplastic polymers which are commonly used with FDM 3D printing, such as polylactic acid (PLA) and polyamide (PA, also known as nylon). Although the most well-known fibers used for this purpose are probably glass fiber (GF) and carbon fiber (CF), these come with a range of issues, including their high abrasiveness when printing and potential carcinogenic properties in the case of carbon fiber.

So what other reinforcing fiber options are there? As it turns out, cellulose is one of these, along with basalt. The former has received a lot of attention currently, as the addition of cellulose and similar elements to thermopolymers such as PLA can create so-called biocomposites that create plastics without the brittleness of PLA, while also being made fully out of plant-based materials.

Regardless of the chosen composite, the goal is to enhance the properties of the base polymer matrix with the reinforcement material. Is cellulose the best material here?

Continue reading “Reinforcing Plastic Polymers With Cellulose And Other Natural Fibers”

Orion Ceases Operations, Future Of Meade Unclear

There was a time when building a telescope was a rite of passage for budding astronomers, much as building a radio was the coming age for electronics folks. These days, many things are cheaper to buy than build, even though we do enjoy building anything we can. Orion was a big name in telescopes for many years. Their parent company also owned Meade and Coronado, both well-known optical brands. A recent video from [Reflactor] brought it to our attention that Orion abruptly ceased operations on July 9th.

We always hate to hear when well-known brands that serve a big part of our community vanish. According to [Reflactor], people who have telescopes with the company for repair are likely to never see them again. [Dylan O’Donnell] also had a video about it (see below), and, as he notes, at that time, the website was still operating, but it’s gone now. To add further fuel to the fire Sky & Telescope ran an article on July 12th saying that Meade was also on the chopping block, although at the time of this writing, their site is still online.

You have to wonder what problems you might have selling telescopes today. Many people live where there is light pollution. We’d like to think there are still people who want to ponder the universe from their backyard, though.

There are still people selling telescopes, so presumably, one of them — maybe Celestron — will take up the slack. Or maybe we’ll see a resurgence in telescope homebrewing.

After all, if you have a 3D printer, you could make a 114/900 mm telescope on a tight budget. Or, try IKEA.

Continue reading “Orion Ceases Operations, Future Of Meade Unclear”

Microsoft Sculpt Keyboard Lives Again With RP2040

Hackaday readers are likely the kind of folks that have a favorite keyboard, so you can probably imagine how devastating it would be to find out that the board you’ve sworn by for years is going out of production. Even worse, the board has some internal gremlins that show up after a few years of use, so functional ones in the second-hand market are becoming increasingly rare. So what do you do?

This is the position [TechBeret] recently found himself in with his beloved Sculpt keyboard. When Microsoft decided to step back from the peripheral market last year, he started looking at alternatives. Finding none of them appealing, he decided instead to breathe new life into the ergonomic keyboard with the RP2040. Every aspect of the resurrection is covered in a phenomenally detailed write-up on his blog, making this a valuable case study in modernizing peripherals with the popular microcontroller.

Continue reading “Microsoft Sculpt Keyboard Lives Again With RP2040”