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Occasionally I don't use the sun as a UV source for cyanotypes.

This is what happens if you place an UV LED torch on cyanotype paper and turn it on for a few seconds.

Each of the LEDs in the torch makes an individual spot.

Combine it with origami and you can get some interesting patterns. This final image started as a Fujimoto Cube, folded from a single sheet of watercolour paper.

#origami #cyanotype #FujimotoCube #blueprint #UVTorch #metamorphogram #UVLED #UltraVioletTorch

Add-On Lets FDM 3D Printer Wash And Cure Resin Parts

The dramatic price reductions we've seen on resin 3D printers over the last couple of years have been very exciting, as it means more people are finally getting access to this impressive technology. But what newcomers might not realize is that the cost of the printer itself is only part of your initial investment. Resin printed parts need to be washed and cured before they're ready to be put into service, and unless you want to do it all by hand, that means buying a second machine to do the post-printing treatment.

Not sure he wanted to spend the money on a dedicated machine just yet, [Chris Chimienti] decided to take an unusual approach and modify one of his filament-based 3D printers to handle wash and cure duty. His clever enclosure slips over the considerable Z-axis of a Anet ET5X printer, and includes banks of UV LEDs and fans to circulate the air and speed up the drying process.

Looking up into the curing chamber.

The curing part is easy enough to understand, but how does it do the washing? You simply put a container of 70% isopropyl alcohol (IPA) on the printer's bed, and place the part to be washed into a basket that hangs from the printer's extruder. Custom Python software is used to generate G-code that commands the printer to dip the part in the alcohol and swish it back and forth to give it a good rinse.

Once the specified time has elapsed, the printer raises the part up into the enclosure and kicks on the LEDs to begin the next phase of the process. The whole system is automated through an OctoPrint plugin, and while the relatively low speed of the printer's movement means the "washing" cycle might not be quite as energetic as we'd like, it's definitely a very slick solution.

[Chris] provides an extensive overview of the project in the latest video on his YouTube channel, Embrace Racing. In it he explains that the concept could certainly be adapted for use on printers other than the Anet ET5X, but that it's considerable build volume makes it an ideal candidate for conversion. Of course it's also possible to use the foam board enclosure by itself as a curing chamber, though you'll still need to wash the part in IPA ahead of time.

This is perhaps one of the most unusual wash and cure systems we've seen here at Hackaday, but we appreciate the fact that [Chris] based the whole thing on the idea that you've probably got a FDM printer sitting nearby that otherwise goes unused when you're working with resin. If that's not the case for you, putting together a more traditional UV curing chamber is an easy enough project.

#3dprinterhacks #enclosure #foamboard #resin3dprinter #uvcurebox #uvled #washandcure

Modified Microwave Cures Resin Parts With Style

Once you make the leap to resin-based 3D printing, you'll quickly find that putting parts out in the sun to cure isn't always a viable solution. The best way to get consistent results is with a dedicated curing chamber that not only rotates the parts so they're evenly exposed to the light, but allows you to dial in a specific curing time. A beeper that goes off when the part is done would be handy as well. Wait, this is starting to sound kind of familiar…

As you might expect, [Stynus] isn't the first person to notice the similarities between an ideal UV curing machine and the lowly microwave oven. But his conversion is certainly one of the slickest we've ever seen. The final product doesn't look like a hacked microwave so much as a purpose-built curing machine, thanks in large part to the fact that all of the original controls are still functional.

The big break there came when [Stynus] noticed that the control panel was powered by a one-time programmable PIC16C65B microcontroller. Swapping that out for the pin-compatible PIC16F877A opened up the possibility of writing custom firmware to interface with all the microwave's original hardware, he just needed to reverse engineer how it was all wired up. It took some time to figure out how the limited pins on the microcontroller ran the LED display and read the buttons and switches at the same time, but we'd say the final result is more than worth the work.

With full control over the microwave's hardware, all [Stynus] had to do was strip out all the scary high voltage bits (which were no longer functional to begin with) and install an array of UV LEDs. Now he can just toss a part on the plate, spin the dial to the desired curing time, and press a button. In the video below, you can see he's even repurposed some of the buttons on the control panel to let him do things like set a new default "cook" time to EEPROM.

Compared to the more traditional fused deposition modeling (FDM) 3D printers, resin printing requires a lot of additional post-processing and equipment. You don't necessarily have to gut your microwave just to cure your prints, but you'd be wise to fully consider your workflow will look like before pulling the trigger on that shiny new printer.

#microcontrollers #toolhacks #curing #microwave #microwaveoven #pic16 #uvled #uvresin

#UVLED
Ultraviolet LEDs prove effective in eliminating #coronavirus from surfaces and, potentially, air and water -- ScienceDaily

https://www.sciencedaily.com/releases/2020/04/200414173251.htm