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Acetone Vapor Finishing

Safety First!

I decided to try my hand at this acetone vapor finishing method of making 3D printed parts smoother.

If you’ve seen 3D printed parts from a “fused filament modeling” printer, you know that there are tiny ridges in the prints. You can print at different layer heights for finer layers (and smaller ridges) but that increases your print time.

As you might be able to see in the image above, I placed a large glass jar on the print bed of my RepRap and cranked the heat up to 110° F. I had maybe 2mm of acetone in the jar. (2mm may not have been enough.) I waited until I could see the vapor cloud on the sides of the jar and then (with gloves on) placed the prints inside.

Here’s the results:

Skulls

Skulls

Skulls

You can see an untreated print on the left, and a treated print on the right. The treated print didn’t get quite enough melting to smooth everything out. (And yes, these were a challenge to photography!)

TARDIS

TARDIS

Another one… the TARDIS on the left shows the ridges while the right one is smoother. Note that the smoothing worked much better on the outer edges, and not as much on the inset parts of the print. It sure does make your parts shiny, though!

I’m sure I’ll keep experimenting with this technique, and hopefully start to improve it.

If you feel like seeing the original full-size photos, check the Skulls and TARDIS on Flickr.

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The Aluminum Velociraptor

Velociraptor Silhouette

I’m not an expert on dinosaurs, but the velociraptor is one of the more respected of their ilk (so I am told) and you really do have to respect such a clever girl properly, so I grabbed this velociraptor silhouette from OpenClipArt knowing that I’d find a use for it some day…

Save as DXF

Since I can now easily cut things like paper and vinyl (did I mention I picked up a Silhouette Cameo?) I opened the SVG file in Inkscape and exported it as a DXF so I could import it into Silhouette Studio.

Silhouette Studio

Now, typically when I export DXF files from Inkscape for 3D printing or laser cutting I need to first remove all the curves by making them straight lines, like I did for my MAKE piece, but the Silhouette software doesn’t mind the curves.

Velociraptor MacBook

A quick cut of the vinyl and I’ve got a Velociraptor stuck on my aluminum MacBook… but wait, there’s more!

Paper Dinosaur

Since I also had a test cut made with paper, and there was some pink foam in the workshop, and we were planning an aluminum pour at Milwaukee Makerspace the next day, I had this crazy idea to use my drill press as a makeshift mill and cut out a piece of foam in the shape of the velociraptor. (You may remember Kevin’s FEAR that was made in a similar fashion.)

Mill Press

I jammed the base up into the foam so the bit was sticking all the way through so I could just run it and not have to lower it. I was then free to use both hands to move the foam around and cut it. (My jigsaw broke last year, but even if it still worked, I don’t think the cutting area of the blade would have been tall enough to fit the pink foam piece I had.)

Obviously using the CNC Router at Milwaukee Makerspace would have been more precise, but I really didn’t have time to do use it. (This was all pretty last-minute.)

Foam Dino

It worked pretty well! With the first attempt I used too large of a bit, but the second try turned out good. I ended up bringing both of them to the casting.

Velociraptors with sticks

For the aluminum casting you need a box, so we built a box and attached some foam sticks to each piece. We used a glue gun, but you need to be careful not to melt or deform the foam too much. I’ve been told that using the glue gun before it gets too hot, or unplugging it and letting it cool before use might be helpful.

The wider sticks in the center of the body are mean to funnel the molten aluminum down to the piece, while the smaller stick on the tail is meant be a vent.

Petrobond

The next step was packing the pieces in petrobond, which is a casting sand with oil in it. You need to tamp it down and pack it tight. (Somehow I managed to do a pretty good job at this.)

Cast Aluminum

Here’s the pieces fresh out of the box (after cooling of course!) There’s also a tiny bird up in the corner. We had a snake/worm shape as well, but somehow it disappeared in the process. Kevin (who helped me with all of this) then chopped my dinosaurs from the big chunk with a bolt cutter.

The Aluminum Velociraptor

And here’s my (mostly) done Aluminum Velociraptor! I’ve still got some cleanup to do, and then need to decide how to finish it, but that’s another project, and yeah, I’m already planning some pieces for our next pour in a few weeks!

Big thanks to Bret, Matt, Kevin, and everyone else who helped make this happen. It was an awesome event, and pretty amazing to show up with some pink foam and walk away with a cast aluminum piece. (Here’s a short video of the event.)

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Google Reader Dies, RSS Lives!

R.I.P.

Google Reader is dead, long live RSS!

I have a history with RSS, writing my first aggregator around 2000 (yes, in Perl) and over the years I got involved with RSS, aggregators, podcasting, videoblogging, and other things that all relied on RSS.

The real excitement for me in the area of aggregation development started in 2004 when Mr. Genehack suggested I look at FEED ON FEEDS. I did, and what followed was FEED ON FEEDS ala Bloglines, Feed on Feeds Unread List, More Aggregator Madness, Yet More Aggregator Madness and lots of time put into development of an RSS aggregator that fit my needs. I really enjoyed exploring new ideas and getting the functionality I wanted. (Mostly)

I wasn’t being paid to work on all this, it was just my “free time” project, and like all “free time” projects, the free time goes away and you work on other things. So it goes…

Eventually I moved to Google Reader and over time I got to love it. Like many, I use it daily. Daily. Multiple time per day. A lot. Back when Feed on Feeds was on my own server I’d use it at home on my computer, and at work on my computer. This was back in the days when people might have one computer, and use a desktop aggregator client. Some even had an “offline” mode, which was important back then because sometimes you were offline. (!?)

In recent years it’s become common to use Google Reader (with one of the many, many apps that used its back-end) on your phone, table, laptop, desktop, etc. I regularly used Reeder on my iPhone and iPad, and Google Reader via a browser on the 3 Macs I use each day. It worked, and I loved it.

Google is killing reader, and I’m not pleased. I could go back to hacking up my own code to build an aggregator, but I’m not excited about it anymore, and I’m out of practice with coding lately. It’s not something I want to do anymore. Google, I would probably pay for Reader. Others have said this as well. I’m sure this won’t change things, and it’ll still be killed (though I hope I’m wrong.)

So tell me Google Reader fanatics, what will you do?

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PIY vs. Buy

Camera Mount

PIY stands for “Print It Yourself” which is a little like “DIY” but involves things you can easily print on a home 3D printer instead of buying.

Remember last year when I made this hot shoe audio mount? Well, a few months back we picked up a Zoom H4n to use for some DSLR shooting, and for the quick & dirty stuff it makes sense to just mount the Zoom on the camera. I just printed another one of my mounts, added two nuts and a bolt, and had one we could use. They’re cheap enough that I could probably print 10 of them so we have spares on hand if needed and still come in under $20.

HS-1

The story doesn’t end there though… at some point I was looking up specs on the Zoom and wanted to check out the accessories and came across the HS-1 Hot Shoe Mount Adapter. It’s basically the same as the mount I made, except it’s probably metal, and it’s about $20 for one of them.

So this time around it was the opposite of my GoPro Frame. For that one, I saw the frame on the GoPro web site and sat down to design my own. For the Zoom mount I ended up making my own before I even knew they had one.

This is the amazing world we live in now… where open source 3D modeling software allows you to quickly and easily design something, and open source 3D printers allow you to quickly and easily print them out.

PIY is the new DIY.

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A Guide to Video for Smart People

The Interview

Every now and then I see a post that talks about photography, and how many factors go into the cost of hiring a “real” photographer (and by “real” I mean “professional”) so for my own reference in the future, I wanted to write up my thoughts on the topic of shooting video. (For our purposes today, assume you’ll be shooting a few talking-head videos for a presentation.)

I’m calling this “A Guide to Video for Smart People” because someone very intelligent, who I greatly respect, hired me to do a video shoot. Since, we had to talk about pricing, I figured I’d share some of my thoughts.

1. When you hire a professional, you get a professional.
What is a professional, exactly? It’s someone who uses pro-gear, and has the knowledge to use it. Someone who has experience, and has done professional shooting before. Someone who knows about shooting, and lighting, and pacing, and talking to talent, and audio, and composition, and dozens of other things you don’t even think about because it’s second nature after a while.

2. Professionals use professional gear.
Everyone’s got a camera nowadays, but there’s more to shooting than a camera. For a typical interview shoot you might have a camera, lens, lights, audio recorder, microphone, studio headphones, tripod, stands, spare batteries, spare cards, spare XLR cables, reflectors, and a dozen other things you bring on every shoot. I’m not suggesting you need top-of-the-line everything, but even on the low-end it can be $2,000 for a basic set-up.

3. Professionals are thinking.
If you haven’t had the luxury of scouting locations, you might show up and get a quick tour of the location so you can pick a spot to shoot in. When I walk into a room, I’m looking at the layout, the lighting, determining where all the outlets are, looking at the height of the ceiling, figuring out where the tables and chairs can go, etc. If there are windows in the room, is it cloudy outside? How will the changing sunlight affect the lighting during the shoot? And that’s all before setting up the tripod.

4. Professionals respect your work.
Besides taking the shoot seriously and doing a great job capturing the footage, a pro-shooter will make sure your work is preserved. Anyone with clients will know that even though you might provide them with files, there’s a chance they’ll come back a year later (or five years later!) and ask for it again. For a recent shoot the raw footage came out to be about 9GB of data. After editing it was about 30GB of data. That all gets backed up, and archived, and managed so that you can go back a year later and provide the footage again.

5. Professionals edit.
Even if the client thinks it’ll be quick and easy and there won’t be any editing… there’s always editing. Unless you’re just doing camera ops for someone else and they want the raw footage, you’re editing. So much DSLR shooting is done today with secondary audio that at a minimum there’s the syncing of audio with the video. Add bump-in and bump-out, a few cross-fades, choosing the best take, and render time, and you’ve got some time invested. (I’m not even getting into the copying, burning, and delivering of the work, but hey, that’s another aspect.)

OK, that’s part one of my “Guide to Video for Smart People”. We covered five points. There are more, but I wanted to keep this brief. The great thing about working with smart people is that they’re smart (duh!) so educating them to some of these facts shouldn’t be too hard to do. Chance are after the first shoot you do, they’ll get it, and it’ll be the start of a great (working) relationship. :)