Sean Fannon (Psychology) and I secured a small grant to get our hands on an OpenBCI, which is an open source brain-computer interface, complete with a headset that can be printed on a 3D printer. Sean plans to use the device to enable students to do some fairly sophisticated brain research. Fortunately, the new Ultimaker 2+ Extended has a sufficiently large build envelope, so I set it up to print half of the headset overnight, and watched it on YouTube in an obsessive way using the Open Broadcaster setup.
Came in this morning, and it all seems to have printed well. In what is a first, I think I might not have enough PLA on the spool to finish the job. Unfortunately, the Ultimaker uses the fat stuff (2.85 mm), and the Printrbot uses 1.75 mm, which I’ve got a lot of. I read somewhere that the Ultimaker can be tweaked to run the smaller filament, so I might just have to give that a shot. Some of the smaller bits I plan to use to test the Form 2 that should arrive some time in early July.
Max and I spent some time in the shop this afternoon, brainstorming Chemistry activities that will make use of the new X-Carve and vinyl cutter, and working on the new Ultimaker 2 Extended+ that arrived the other day. After some tweaking, we got the printer running, and decided to print this Dewalt DWP611 Thread-On Dust Shoe from Thingiverse (CC BY Noah Mackes). Up until now, we’ve been using the X-Carve as a plotter, but Marisa Sayago (Professor, Art) and I have been talking about some printmaking ideas that involved cutting and engraving, hence the need for the dust shoe.
The printer reported that the job was going to take 17 hours, so Max and I decided to set up a webcam and do some R&D on Open Broadcaster Studio, which I have been considering using for the live fishcam that will be part of the aquaponics project. We installed the software, plugged in the camera, put in the YouTube live streaming information, and it all worked perfectly right out of the gate.
By the time I got home, the camera had slipped or been knocked sideways, but the print is still visible!
I’ve been working with technology for many years, but the idea that I can relatively easily monitor from home a 3D print job of a part I need and was able to download for a CNC machine that can be used to support (among other things) hands-on student activities in Chemistry and Art, while simultaneously testing a software program and a streaming service for another project that combines Library, Chemistry, Biology, Theater Arts, fish, and plants is, frankly, pretty neat.
I almost forgot – I made a Voronoi Totoro on the X-Carve (in plotter mode):
Back to the build… After a successful build day last week, we started Build Day 2 with some goodies, including Diane’s home-roasted coffee, egg and cheese sandwiches, homemade scones, muffins and pastries:
Today didn’t go quite as smoothly as I’d hoped, mostly because I mistakenly believed that one of the rails had not been tapped, which triggered a mad dash to the local hardware store for a tap and die set that turned out to be unnecessary. My mistake transformed into a learning experience and some skill building, so it wasn’t all bad:
We were able to get the Z-axis assembled:
And all of the motors wired:
We’re planning on finishing up the project after the weekend, and then we’ll get to carving!
Helping students rig the balloon, with the 3D printed picavet in the foreground:
Lowering the rig to clear the canopy:
Nothing better than doing real science in the field with students (plus wearing a sweet safety vest):
Additional photos and datasets at the project blog dolookdown.org
Max Mahoney (Chemistry) and I have been collaborating on a volumetric display for the 3D visualization of molecular models. We developed a pretty sweet prototype, and then Max had the idea that instead of one big monitor, wouldn’t it be easier to just have 4 identical small monitors?
Indeed I think it would be.
The video can be sent from the computer to a 4 way HDMI splitter, then sent to 4 identical monitors – maybe 7″? – each rotated 90 degrees. No special software to deal with, no creation of a special 4plexed version of the video. An elegant volumetric appliance, at least on paper…
Jennifer Kraemer (Early Childhood Education) was in the lab today, printing up some new connector pieces from the Free Universal Construction Kit. I used the K’NEX-to-Lego connectors in a workshop over the summer, and Jennifer is planning on printing many more pieces for use next week for activities with her ECE students.
Side note – I’ve been really impressed with the performance of the Printrbot Simple Metal. It’s been getting a fair amount of use lately, with the aquaponics nozzles and Max’s molecules and molecular visualizer and the picavet parts, and it just seems to go and go without being fussy. That said, I have my eye on a Formlabs Form 2. I’m especially interested in the castable resin. It would be great to get a metal pour going in the fall!
Working with Max Mahoney (Chemistry) on a molecule visualizer, and we had the opportunity to throw the prototype on a 30″ monitor. The results are encouraging!
Next up: Max is going to render a custom molecule video. We’ll format that for the system, and assuming all goes as planned, work out the enclosure issues, which will likely involve some CNC work.
After addressing the venturi challenge, I was able to get the second chain of recycled bottles for the drip aquaponics system set up:
It ran all weekend without a hitch, and the science fish seem pleased. I’ve planted the bottles with cuttings of mint, oregano, yerba buena, and lemon balm, and hopefully they’ll all root.
Max Mahoney (Chemistry) and I met today to do some preliminary sensor calibration for the aquaponics system. Max brought over various solutions of known pH and µS/cm.
We connected the pH sensor to the Cooking Hacks Open Aquarium shield, and went through the procedure of calibrating the sensor, which involved basically sticking the sensor into a beaker of various solutions, recording the values, and tweaking some variables in the Arduino sketch.
The process for the electroconductivity sensor was much the same. Both worked without a hitch, and once the calibration procedure was complete, we tested the water from the experimental system – 7.54 ph/298.24 µS/cm – and from the quarantine tank – 7.07 pH/176.83 µS/cm. There’s something up with the temperature sensor, which gives a zero value no matter what, so we’ll need to get that sorted, but overall a very successful work day. To top it of, the power and Ethernet should be installed out in the library tomorrow!