Thursday, June 19, 2014

My first from-scratch project with my 3D printer

After much research on 3D printers, I settled on the $750 "CTC" one off eBay.  It's a clone of the original Makerbot Replicator, and I suspect it's made by the same factory that originally made the Replicator for Makerbot.  Makerbot has moved on to fancier and more expensive units, but in my research I just couldn't seem to justify the extra cost for the final product.  In fact, I looked at possibly spending at much as $15,000 on a printer, and yet still settled on this $750 unit.

It really seems like you have to step up to $20,000+ printers to do significantly better things than this CTC printer can do.  You would need to be running it constantly, and I'm merely a hobbyist who was looking to learn a few things and perhaps make a few things that could really be used in the real world.

I started out printing a few things I found on Thingiverse.  I'm kind of surprised more people don't just grab things from there and pay to have them printed at sites like Shapeways.  Before I bought my own printer, I did do 3D model of an enclosure I wanted and had Shapeways print it.  The service takes several days including shipping, but it's not terribly expensive and the quality is quite good.  But all it did was whet my appetite to be able to print my own things NOW.  Enter the research and the purchase of the CTC printer.

The first few prints included some mediocre iPhone cases as well as a cool little GoPro mount, seen here:


Not the most complex thing, but it actually works pretty well.  Here's one used to adapt my mountain bike headlamp to work on the GoPro mount of my bike helmet:

The material is VERY strong and fairly lightweight, too.  If there's a downside it's that the color palette is a bit limited and the time to print is pretty slow.  This little item takes about 25 minutes just to print, but setup and everything included makes it more like an hour for the first one and about 35 minutes for each one after.

But for my next trick I really wanted to do something original.  And our annual beach trip is coming up, where I love to surf in our beach kayaks, as seen here from last year:


A fun thing to do is add a second video camera on the bow of the boat.  Unfortunately there's no good way to do that on these particular boats (and we've tried several different sit-on-top kayaks for surfing, and these seem to work better than most for a 200 pound adult).  So I set out to make something that would work in place of the grab handle in the front.

Here are the parts as I designed them in Sketchup:




 And assembled in place with a GoPro on the boat:


Normally the boat would have a small piece of plastic down where the string connects in this photo attached with a short screw.  I removed that and took the handle off that piece and put it on my GoPro mount.  Then I bolted everything through with a long bolt into the original hole.  It seems every bit as strong as before, except now there's a place to put a camera.  I normally use a chest cam for the best action, but a camera pointed back at the rider is a fun view, too.

There will be more almost-interesting things coming from my evil lab, but not until after the beach.

Saturday, May 17, 2014

Dear Garmin, You're Drunk

So today I ran in a place I had never been before, and I was alone.  I was fairly sure I'd have cell service and I figured that if I needed to see a map I'd be a little happier using my phone than a watch, so I started the Strava app to record my run as well as my Garmin Fenix 2.  And I'm glad I did.  First, the Fenix 2 data as seen after uploading to Strava:



The most odd part about this?  I didn't do a loop.  I did an out and back.  Here's the data my phone recorded:



That's much more accurate at 6.7 total miles.  The first one had a bonus .7 miles for a total of 7.4.  Crazy.  The Fenix 2 is currently running the latest firmware from Garmin.  I did get two separate warnings that it lost satellite reception.  But it really shouldn't have as I don't think the phone did.  The phone was being worn on my left bicep and the watch on my left wrist.  Clear day, but I was on the side of a mountain.  No huge cliffs near me, and it was a single lane fire road the entire way, so tree cover wasn't that great.

If anyone from Garmin is reading this and needs the data to examine, you can find it here.