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Special Content: Repraps for Education

This is part of a series of posts about starting and facilitating a project-based 3D printer club at a local elementary school, with the ultimate goal of replicating the program at schools everywhere. We'll be posting as many details as possible, including lesson plans and supporting materials. For more information about the entire project, including a listing of posts related to it, please visit the 3D Printer Club for Schools project page. 

Here’s a quick update on some of the projects we’ve been working on this year:

We got a Mazda CX-5 and so far we’re pretty happy with it. We wanted an organizer in the back, though, to help prevent things from falling over and rolling around, and we wanted it to be easy to collapse if necessary. Here’s how we made one for less than $15. Add a few extra dollars for bungee cords to hold the organizer in place if you want. (Mazda recommends that you secure the stuff you put in the back.)

The bins were designed to accommodate our reusable grocery bags, with some tight nooks in the back for things like baseballs, pencil kits, and books. (The kids can open up the middle section and reach back.) Placed close to the back seats, this design still allows access to things stored with the spare tire. It can be disassembled pretty quickly if necessary. 

20130805-131227.jpg

Supplies:

  • 1 piece of 1x6x10′ pine (whiteboard) lumber, and be sure it’s not splitting at the ends. This should cost about $10 at the home center — ask them to cut it in half for you and you’ll be able to fit it into the CX-5.
  • 1 can of flat black spray paint. I got Painter’s Touch, which was labeled “primer + paint” for less than $4.
  • 2 bungee cords, approximately 18″ long unstretched. We had these laying around from a Harbor Freight assortment kit we got a while back. They’re probably about $1 each, and are use to secure both the organizer to the floor, and secure bags in the two outer bins.
  • 4 3/4″ felt pads. These are really optional, but might help prevent damage to the interior of the car. We had them on had, but you can also pick them up at the home center for a couple dollars.

Directions:

  1. From each 5-foot length, cut one 41″ board, and one 17″ board.
  2. On both 17″ boards, measure in 1 3/4″ from each end and cut a 3/4″ slot across half the width of the board. Cut both boards together.
  3. On both 41″ boards, measure 13″ from each end and cut a 3/4″ slot across half the width of the board. Cut both boards together.
  4. Also on both 41″ boards, measure about 2 1/2″ from each end and drill a 1/2″ hole so it overlaps the edge of the board enough to fit a bungee cord. Do this on the opposite side from the slots if you want the 41″ boards to hold down the 17″ boards, or on the same side to make the weak ends of the 17″ boards a little more protected from accidental breaks.
  5. Sand, assemble, and paint.
  6. Attach a felt pad to the middle of the end of each 41″ board, and install into car. Run the bungee from the back hook, through the drill holes, and up to the front hook. You can tie a knot in the bungee where it passes through the board to help keep it in place if it slides.

Boards

It’s important to note that the small sections of 17″ board on the outside of the 41″ boards will be weak because there’s only 2.5″ against the grain holding them in place. If you’re going to be disassembling/reassembling this a lot, you might want to glue some blocks to those weak areas to strengthen them.

Special Content: Repraps for Education

This is part of a series of posts about starting and facilitating a project-based 3D printer club at a local elementary school, with the ultimate goal of replicating the program at schools everywhere. We'll be posting as many details as possible, including lesson plans and supporting materials. For more information about the entire project, including a listing of posts related to it, please visit the 3D Printer Club for Schools project page. 

In this video, Jacob shows an easy way to make very simple and inexpensive (yet dependable) bare wire end stops for your 3D printer (or other motion control project). This design helps to “demystify the box” by putting all of the switch mechanics in plain view, making it very easy to understand. We’ve had a printer with end stops just like these running without incident for over a year.

Our original “One-Penny Bare Wire End Stop” can be found here, but you can see from the video that we’ve changed the way we do it slightly: http://www.thingiverse.com/thing:23878

Supplies used: Old network cable, paper clip, end stop holder, electrical tape, solder, and about 2 cm of solid copper wire. Tools used: Wire strippers, small triangular file, needle-nose pliers (with wire cutter), ruler, soldering iron or gun, and scissors.

Music: “Crosstalk (Take 3)” by Javolenus, 2013 – Licensed under Creative Commons Attribution Noncommercial (3.0), http://ccmixter.org/files/Javolenus/41845

Here’s a short video that shows how I make hobbed bolts using an M4 tap, a drill press, and a couple of 608 bearings. If you don’t have a grinder, you can chuck the bolt in the drill press and use a dremel tool or file to cut the groove. The groove gives the tap something to bite into.

Please pardon the focus hunting and lighting—it’s thefirst video with the DSLR. And here’s what especially cool about this video: At about 2:40 you might notice that the bolt is spinning in time with the music… totally unplanned.

Here’s the result. You may notice that I was trying to correct for a slightly off-center grind, so the cut profile looks a bit different on either side.

vlcsnap-2013-04-22-18h50m14s233

Music: “Me Robo El Show” by Alex, 2011 – Licensed under Creative Commons Attribution (3.0) http://ccmixter.org/files/AlexBeroza/34167

(BTW: Yes, I’m aware that the lyrics have nothing at all to do with making a hobbed bolt, but this is a great mix of an excellent vocal by Farina, and so I used it anyway.)

This came out a couple of years ago, but someone reminded me of it just this weekend so I thought I’d share it. It’s a great little introduction to soldering. Click on the image or the following link to visit the site and see the full cartoon tutorial. (http://log.andie.se/post/397677855/soldering-is-easy)

soldering_howto_cartoon

Make Magazine also did a great “How to Solder” round-up a couple years ago. Visit that site here: http://blog.makezine.com/2009/07/21/super-learn-to-solder-its-fun-round/