Category Archives: Uncategorized

Makers & Covid

Castlemakers window display of covid-19 projects on Franklin street.
Face shields and a 3D printed mask made at the makerspace.

Our blog posts have been running behind lately, but we’ve been busy the last few months. We’ll update with some older entries since like many folks we’ve had more ‘stay at home’ time with the COVID-19 mess that’s been going on.

Even though we’ve stopped having public events since mid-March, there have been things going on inside (using recommended guidelines). Our main 3D delta printer has never been worked so hard in such a short time since we got it 3 years ago.

The picture to the right has some examples of what’s been made there to help first responders and others with the COVID-19 battle. We can’t make things in large quantities, but we can fabricate and adjust quickly – plus worldwide the makerspace community has rapidly stepped up to help people where they can. Longer term existing manufacturers will and are already starting to fill the gap, but it sometimes helps to do locally what can be done until the gap is eliminated. We’ve got a special webpage with some of the local projects going on in Putnam County and more details about how the face shields, face masks, and ear savers can be made.

Liquid Nitrogen – August Meeting

What happens when you hit a marshmallow frozen at -196°C.
What happens when you hit a marshmallow frozen at -196C.

At our August 9th meeting we covered the Water Balloon Challenge, which is now up to 8 groups. Details on our project page, but they seem to be performing so well that we concluded that the Greencastle Farmer’s Market display in early September should be a demo, not the actual competition, since the Greencastle square may not be large enough!

What happens when you insert a balloon into liquid nitrogen. There's also a video where you see it shrink and then expand.
A balloon being shrunk by inserting into liquid nitrogen before re-expanding, the record was 4 times for one balloon!

For our ‘show & tell’ portion Chris brought liquid nitrogen in a dewar for experiments. After explaining describing liquid nitrogen and where it comes from, we poured the -196°C (-320°F) liquid over the marshmallows that Alice had brought in. We also froze a banana to drive nails into a piece of wood and then tried lots of things that kids and the adults suggested. Some that worked and some that didn’t!

A raw egg that was frozen first with liquid nitrogen then melted down during the meeting back into a normal uncooked egg.
A raw egg that was frozen first in the shell with liquid nitrogen then thawed down during the meeting back into a normal uncooked egg.

Freezing balloons was a big hit, the kids had tons of questions which you can hear and see in the balloon video that Brian H. took. For the coin collectors there, we showed how older copper pennies are more malleable at minus 200 degrees Celsius than the new copper plated zinc pennies – which shatter after hitting them with a hammer!

There’s another good regional event for science in Bloomington on 8/29, Makevention, along with some other events on our events page. Last year we took one of the shovercraft (shoveable hovercraft) to the Bloomington event and did demonstrations. It’s well worth the trip if even to just to look at what other people are doing.

Since we’re starting to look for projects after the Water Balloon Challenge, I can’t help but mention the Lexus created hoverboard that uses liquid nitrogen. I just watched a video (long version) on it, sort of outdid our shovercraft but a lot of more engineering in that design. Now that would be an awesome next project!