Tag: 3dprinting

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Fixing the Fixture

Adapter

I (somewhat) jokingly posted something the other day about how my wife asked me to 3D print something, and was totally serious this time and not sarcastic about it. To be fair, she’s heard me say “I’ll just 3D print one!” about 100 times this summer, and was probably sick of it, but when you live in the future, it’s pretty damn exciting.

Or story begins back in 2009 when we moved into our current house. The light above the front door was just a bare bulb, with nothing around it. I’m assuming there was a glass ball at one point, and it must have broke, or been stolen, or dematerialized. No matter, we can fix it.

3D Printed Part

While at Home Depot the wife found a cheapie plastic majigger that would fit over the light bulb, so we bought it. This is also when she suggested I could “make it work” and thus, I agreed.

I ended up using OpenSCAD to design a simple ring that would press-fit the new piece, and have the needed holes to fix the fixture… and adapter, if you will.

It fits!

It worked! As you may notice, there are no mounting holes. I often don’t bother making holes in the objects I print because I’ve got a drill press, and it makes much more precise holes than the RepRaster 5000 can. (And just to be clear, the clear piece is not what I printed. I printed the black piece. Got it?)

Holes for screws

Here’s the piece after I drilled the holes and secure it into the fixture with two small bolts. Sadly the small bolts are a little long, and stick out the top, but hey, it’s still an improvement.

Fixed!

So now on the front of the house is this lovely cheapie plastic majigger instead of just a bare light bulb. Home Improvements FTW!

This is one more thing where I really don’t know how I could have done this as elegantly without a 3D printer. Using open source software I designed the needed adapter and then printed it out using open source hardware, and the total cost of materials (ABS plastic) was probably less than 50 cents. As I said… living in the future and all that.

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3rD Times The Charm!

Three Motor Holders

While I usually describe 3D printing to people with something like “you can make beautiful things that are art, or functional things like parts” I’ve been printing a lot of parts lately (thought I still print pretty things!)

The parts I’m printing are of my design, for things I am building, and they often have to fit existing real-world objects. The process usually involves measure thing with calipers to get dimensions, and then designing things in 3D software. (I’m leaning more towards OpenSCAD latley, as opposed to Sketchup.)

If you’re just downloading and printing objects from Thingverse, they’ll (hopefully) work on the first try, but if you’re doing everything on your own, it may take a few tries.

I wanted to print a small motor mount for this DC motor that Adafruit sells. So I got out the calipers and went to work.

Motor in the second holder

For the first attempt (see top photo) I completely screwed up by using the inside dimensions (where the motor should fit) as the outside dimensions. Stupid mistake! On my second attempt I got it right, and the motor fit almost perfectly.

Motor in third holder

On the third iteration I made minor adjustments to the outer walls, and I also added an “air hole” on the top. The motor has two slots in the body which I assume draw air into it to prevent overheating. (You can see I know very little about motor design right now.)

Motor and holder

Back in June when the guys from MakerBot stopped by Milwaukee Makerspace, I talked to Skimbal, and asked how many revisions he went through when designing things, and he said about two or three. I was impressed by this because last year I tried designing a real-word replacement part and I think I made about ten versions of it. Of course part of this was my lack of 3D skills, and part of it may have been issues with the old CupCake I was using.

Motor in the holder

So I’m pretty happy with the fact that I can get a good version of a part in just a few tries now. (Though I should admit that I’m not happy with the slots for the screws, and may end up tweaking things a bit more, which is pretty darn easy in OpenSCAD.)

When I was talking to someone about 3D printers this summer, they didn’t see the point of having one at home when there were so many companies that allowed you to upload a design and would print it and ship it to you. Here’s where a home 3D printer shines; I can measure a part, get a prototype printed, test it, and print another version all in a single afternoon. Now that’s rapid prototyping!

And a mirror holder!

Oh yeah, I also printed a mirror holder. It took just two revisions to get one that worked well.

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3D Printed Guns for Everyone!

Glock (from Thingiverse)

The media is up in arms about Have Blue’s “3D printed gun” (which he brought to the Milwaukee 3D Printing Meetup last month, by the way…)

And yeah, I put “3D printed gun” in quotes because it’s just one part of a gun. But you’ll see headlines like Hobbyist builds working assault rifle using 3D printer, Functioning 3D-printed rifle you can make at home, The world’s first 3D-printed gun is a terrifying thing, and A Working Assault Rifle Made With a 3-D Printer.

Those are all great headlines, and if you read the articles, they might explain things a bit more, but the short version is, Have Blue printed a part of a gun. He didn’t print an entire gun, and he didn’t print ammunition. The next headline might be “Guy with tools makes a gun” because the only new thing here is the 3D printed part. People have been making guns at home with machine tools for years, and as I understand it, it’s legal in the United States.

Saying he printed a working gun is akin to saying I printed a house because my RepRap made a coat hook, and I just, you know, assembled all the other parts around it to complete the house.

So before you think I’m some gun-toting lunatic building weapons in my basement, well… I’m not. (I do have a few Art Robots I’m working on, but the headline “Man builds working Art Robot with 3D Printer” is not very exciting.)

Anyway, I figured that everyone needed a gun, so I grabbed this Glock from Thingiverse. I printed it out in 30 seconds. Well, in an hour, but the time lapse below is 30 seconds long.

So here’s a nice photo showing my 3D printed gun. It’s orange because I’m running low on black filament and haven’t got any nice silver filament yet.

3D Printed Gun

I wanted my 3D printed gun to be a little smaller so it would fit in a mint tin. Oh, did I mention it’s not fully functional yet? Yeah, I should have mentioned that…

I’ve been thinking a lot about guns lately, and if you can forgive me this (slightly) humorous post, I’ll expand upon my gun-related thoughts in a future post.

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3D Printing Camp ReCap

3D Printing Camp Wisconsin

It all happened pretty fast… I think it was the beginning of May when Bob Waldron floated the idea of a BarCamp-like event focused on 3D printing past me, and of course I couldn’t ignore it. I helped set up the web site and did some promotion and sponsor-wrangling, because I figured if he was throwing such an event, I wanted to see it happen so I could go to it. :)

3D Printing Camp

Getting sponsors took a lot of time, but in the end (and I mean very end!) we got what we needed, and were able to cover most of what we wanted for the event. People got fed, Sector67 got a few bucks for use of their space all day, and nothing went wrong… well, almost nothing.

If you attended 3D Printing Camp you owe a big round of applause to Bob Waldron, but you couldn’t give him one on Saturday because he was not there! Despite all the comforts of our modern world, if your plane gets delayed, and you get stuck, you miss things… and Bob missed the event. (Don’t worry, this will just ensure he does it again next year.)

3DPrintingCampWisconsin

So what did we do? Well, we printed. A lot. And we also had a few sessions related to 3D printing, modeling, security, repairing things, and we just generally got to meet everyone else who is into 3D printing. Remember back when you were the only person you know (not counting online) who was really into something, and if you got to hang out with others who were into the same thing, how awesome that was? Well, yeah, that was it. I think we had about 20 printers, and saw over 60 people come through the door throughout the day. Not a bad turnout at all.

3DPrintingCamp

For me one of the highlight was learning more about Sketchup. Kemper Smith led an amazing sessions showing tips & tricks for 3D modeling and I took plenty of notes.

And then there was Tony Warren, who showed up with a partially done RepRap and got it printing by the end of the day. I can certainly attest to the fact that having an unfinished printer is something no on wants, so getting it running is pretty awesome.

3DPCWI

The event was pretty laid back, and plenty of people just spent most of the day (and evening!) printing, which is cool. There could have been more sessions, but when you’ve got all those printers in a room, you want to talk about them, and trade tips, and melt some plastic. It’s all good.

As for the RepRaster 5000, it started a little shaky because I could not get my bed up to temperature, then I noticed a ceiling fan above me! I moved and all was well, for a while. I printed a few things, and then I did a print that failed, then the next one failed, and then it was time to just give up. I had managed to knock things out of alignment earlier and I think things just went pear-shaped from there. Too much printing I guess. Once I got home I got everything back to normal, leveled the bed, and it’s back to normal. (It’s always a RepRap adventure somewhere…)

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A New Elbow

Arc-O-Matic

You may remember the Arc-O-Matic, an Arduino-powered drawing robot I built back in March for Gallery Night.

Well, things have been quiet on the Arc-O-Matic front for a while, and there are reasons for that. First, while shooting a video showing how it works, It started to fall apart. This was not unexpected. The whole thing was built in a few hours, and held together with hot glue and gaff tape. Failure was just a matter of time. Second, while it was in my workshop awaiting repair, one of the cats (ChaCha!) managed to knock it off a table onto the concrete floor, which made things worse.

But an important thing happened between the destruction of the Arc-O-Matic and now… I can easily 3D print things!

Elbow (old)

Here we see the old elbow mechanism, which consists of glue and tape. Pretty sad. It held up fine for Gallery Night, but it’s no permanent solution.

So my first idea for repair was to take some of the weight off the arm via the elbow joint. I thought about buying some ball casters but then realized I could just print my own! Here is one on Thingiverse, and here’s a photo of the one I printed. My initial idea was to just glue this on to the bottom of the micro-servo.

But when you’ve got a 3D printer, why stop there? I ended up designing a part that would hold the micro-servo, and allow the dowel to attach to it. See this photo.

Now, I know some of you still don’t get Google+, so here’s how it works. I posted my progress there, and someone who follows me mentioned a post about Florian Horsch printing a servo coupler on a Ultimaker. My first thought was, “crap, can I print that on my MakerGear Prusa?” And yes, I definitely can.

Elbow (new)

So here’s the result so far. A new elbow. The bottom piece holds the larger dowel and the micro-servo, while the top piece fits snugly onto the business end of the micro-servo and holds the smaller dowel. I’ve not yet attached the ball caster (which uses a marble) in this photo, but I tested attaching it to an earlier version using acetone to weld the plastic together. (I suppose a screw could be another option there.)

I’m hoping to get this thing rebuilt and working before the end of July (hint hint!) and once I’m pleased with all the pieces, I’ll write up some instructions, toss the files on Thingiverse, and hope someone else thinks it’s cool enough to play with.