Categories
Uncategorized

Ryobi Air Pump Repair

I got one of these Ryobi Air Pumps a few years ago, and it worked great for filling bike tires, and I occasionally used it to fill my car tires, though it’s really not great for that. At some point last year it started smoking a bit and I thought the motor was burning up, so I opened it to find the fan (that appears to be meant to cool the motor) slightly broken.

I found a customizable fan blade file and modeled it to fit the motor shaft. It printed well enough and I put it in place.

I did have to ream out the hole with a drill bit, but once I did it pressure fit on the shaft perfectly. I’m not really sure how the original fan broke, but at least now I’ve got a replacement, and can make more if needed. (I printed it in PLA, so it might melt… who knows?)

Oh, and does it work? Well, the pump runs, but it always runs. I did smell what seemed like burned motor winding, so I’ll need to try it out on the bike tires and see if it’s up to the task.

Categories
Uncategorized

3D Printed Print Baren

In the world of printmaking (of which I am far from an expert) there are many ways to print, including a printing press. I no longer have easy access to a press, so I’ve been using alternate methods of getting ink on paper. One method is to use a baren. The baren is a thing you hold in your hand to rub the paper against the printing plate, thus causing the ink to be transferred.

I bought a cheap Speedball baren years ago, and I never liked it, so I started looking at other barens. Now, printmakers tend to appreciate fine things and aesthetics, and there are a lot of different barens out there. Some are made of glass, some are bamboo, some have rope or ball bearings or pads, etc. So I finally asked the wisest of printmakers I know, and Jessica told me she just uses a wooden spoon.

Well, I decided to just make my own baren. So I quickly modeled something really ugly, and I 3D printed it. After I printed it I thought of a better way to model it, and I still haven’t made a new one. This one works, so I’ll just keep using it for now. It’s functional. It’s good enough.

I did sand the bottom of it… quite a bit! Working my way up to high grit sandpaper until the bottom was smooth. Really smooth. It’s smooth. Yeah. Smooooooth. I also sprayed it with Liquid Wrench and rubbed that in real good. It glides across the paper really nice. I’ve done a few prints with it and I’m pretty happy. 3D Printing. It’s handy!

Categories
Uncategorized

3D Printed Skull

I printed this skull back in 2019. The original file is this skull from Thingiverse. Now, it’s October 2020, so yeah, this took a while. I mean, I had it all printed long ago, and then I did an experiment where I covered one half of it with wood glue, and the other half with Smooth-On XTC-3D High Performance 3D Print Coating. I did this because I hate sanding prints (or wood, for that matter) and I wanted to test both methods of coating. For this application, I don’t know that it made much of a difference, but that might be due to the organic shape, and the fact that I primed and painted it afterwards…

Somewhere I’ve got photos of the coating process, but since they are nearly a year old now, I forgot to locate them. I do remember that the glue method took many more coats than the Smooth-On method, though of course glue is a much cheaper material…

You’ll notice the skull also looks a bit “weathered” and yeah, that was another test. I am not an “authentic movie prop maker” so I don’t know all those methods, and what I did was actually rub mud/moist dirt all over this thing and then let is sit for a long time. I eventually washed off a lot of the dirt because, well it was really dirty looking.

There are a few delicate parts of the print, and I’m pretty sure I broke off at least one piece and glued it back together. Again, since this is a pretty organic shape, no worries. And yes, it is pretty much life size.

I printed it in two pieces after slicing it in half, which means the surfaces touching the print bed are not visible as they are in the center of the skull, glue together. There’s a pretty bad seam that I never managed to get that sanded down quite right. I probably should have just taken a Dremel to it.

Overall I’m fairly pleased with how the skull turned out for a 3D printed object. It’s rare that I print “decorative” or “sculptural” prints since most of my prints are internal to some sort of enclosure with electronics inside.

Remember, the great thing about skulls is that we’ve all got one! (At least I hope.)

Categories
Uncategorized

Vinten Tripod Leg Lock

I was doing a video shoot with Ben Nelson for Brown Dog Gadgets last week and I noticed his Vinten tripod leg had an issue staying locked in place… Seems one of the leg lock pieces had broke in half. It seemed liked a perfect reason to fire up OpenSCAD and get the 3D printer spitting out a new part.

In the photo above you can see the new part in silver, and the two original parts on the other legs, in black.

It took two prints to get an acceptable fit. The first was a little too wide and wouldn’t quite fit in place. I tweaked the file just a bit and the second version worked well. I’ll walk through the process a bit below.

For an organic shape like this I usually start by putting it on a desktop scanner to get the profile. This one is curvy, and I’m not big on drawing curves in OpenSCAD, but I am big on scanning in an object and then tracing it in Inkscape. I did a few scans and even then I edited the image a bit to adjust the contrast.

I import the images into Inkscape, each layered directly on top of each other, then add another layer on top of that to do the drawing. I can then easily switch out the image below and compare things. For a symmetrical drawing like this I really just need to draw half of it, then I just dupe and flip to make the other half and combine them into one.

Once I have a vector file created I export that and then import it into an OpenSCAD file where I can extrude it changing it from a 2D shape to a 3D shape. Creating a solid object is the goal. Once I’ve got a solid object I can start knocking holes in it and adding angles by subtracting with various shapes. (The reddish parts are all subtractions or differences from the main piece.)

And yes, the above image does appear to be some sort of special forces TIE Fighter from the Star Wars universe.

Here’s our final piece, ready to be rendered, sliced, and printed. The original part had some pockets on the top and bottom, but since they were not required for functionality I left them out.

Ben installed it and briefly tested it and it seemed to work, though time will tell if it holds up under stress. (Also, this one is PLA so if he leaves the tripod in a hot car, it might soften and fail.) I’ll probably print a few more for him to keep in the tripod bag in case this one does fail in the field.

If you want to print one of these, you can grab the file from Vinten Tripod Leg Lock and have fun!

Categories
Uncategorized

SD Card Rescue Mission

I got a frantic message from my daughter Saturday morning. Seems she was shooting photos all day on Friday and when inserting the SD card from her camera into her computer (and another computer, and then her camera again) it would not mount. She did note that it was a little “damaged” on the corner…

The photo above shows some of the carnage that ensued. She brought the card to me, and I told her I’ve read that you can cut the card in half, remove the “chip” and insert it into a new card. I first cut in half a micro SD card adapter (since I have a lot of them) but that was no good. It’s internal design didn’t match up. No loss. Then I tried the card that came with my 3D printer, since it was only 4GB, and that did not work… I eventually told her that she might have to purchase an exact match so the chip would fit right…

She headed out to the store, found one, brought it to me, and five minutes later, Bob was your uncle. Meaning… it worked! I did warn her to just copy all files off it, and not to rely on it for the future. (She also bought a new SD card to replace it.) So now I had two of the “chips” from SD cards with no cases…

What else to do but 3D print replacements! I found a few models, and chose this Replacement SD Card Case to print. It printed pretty quickly, since it’s small and flat.

I ended up using a bit of super glue to hold the chip in place, and then adding electrical tape to it to shim it a bit so it would fit right into the SD card slot…

It sort of works… in some SD readers, but not all. That said, I’d recommend this fix for rescue, but I’m not sure I’d call the card reliable for everyday use. For instance, I’d prefer to not have it fail physically in my laptop, but in an external card reader I could tear apart if needed, I’ll use it. It seems to work fine in my Nikon camera, but not in my 3D printer, so… hit and miss.

If you go this route it might work, it might not… maybe there’s a better 3D model to use, I don’t know, and I super glued mine in place, which means I’ll wait until the next SD card failure.