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Java - everyone loves it and it works well everywhere. Maybe.
Guinea Pig Wanted - 14 years ago
I've just finished printing a set of RP parts (photo and parts list attached) and I'm looking for someone local to Garner NC who wants to build a Mendel. So, here's the deal: 1. The parts are free. No cost. It's just the RP parts, though. No electronics or hardware. 2. You'll need to be in the Triangle. 3. The parts should be OK. Some have slight warping but should work. They're also a bit stby degroof - North Carolina RepRap User Group
Re: Accurate measurement of filament feed rate. - 14 years ago
Maybe you could draw radial lines on the idler wheel and use it as an encoder.by degroof - Plastic Extruder Working Group
Re: Pololu Circuit Question - 14 years ago
Not that it matters in this case but aren't the "in" and "out" pins are swapped on the 78L05?by degroof - Controllers
Re: Makerbot's Cupcake will be on Jimmy Fallon tomorrow icing cupcakes. - 15 years ago
Does this work?by degroof - General
Re: Makerbot's Cupcake will be on Jimmy Fallon tomorrow icing cupcakes. - 15 years ago
Just showed up: It's at the 31:40 mark.by degroof - General
Re: Makerbot's Cupcake will be on Jimmy Fallon tomorrow icing cupcakes. - 15 years ago
Saw it last night. Should show up on Hulu soon. Minor mishap involving the icing extruder but still good.by degroof - General
Single-sheet flatpack plywood design competition - 15 years ago
Slightly off-topic. Something tells me there's people here who might have some ideas on this:by degroof - General
Re: strangest problem ever! - 15 years ago
You know how, on the board, it says "For ZD1901, etc: cut A, jumper B"? You didn't do either of those, right?by degroof - Controllers
Re: A telepresence 'bot... - 15 years ago
I've had a similar idea bouncing around in my head for the past couple weeks: A telepresence robot capable of extending to human height for interactions but also capable of folding up into a shippable package. The idea would be to FedEx your bot to where it's needed, have it do its job, head to the nearest FedEx store, fill out a shipping label and ship itself back home (all under your remote conby degroof - Let's design something! (I've got an idea ...)
Re: AoI: Height Map to Solid? - 15 years ago
I was able to get the image into a height map and extrude the result into a 3D solid. I used boolean intersection with a cube to slice a flat side. The result is here: A bit choppy but workable in principle.by degroof - RepRap Host
AoI: Height Map to Solid? - 15 years ago
I've got a greyscale image that I want to turn into a solid. I can import the image into AoI and turn it into a height map but that'll just give me a single mesh surface. What I really want is a flat-bottomed solid with the height map as the upper surface. What's the best way to do this? My first guess is to extrude the mesh upward, then use boolean modeling to slice the bottom flat. Any thoughtby degroof - RepRap Host
Cookie Cutters - 15 years ago
A discussion on a completely unrelated site got me thinking about printing custom cookie cutters. Something like these: It should be fairly easy to create the contour, assuming there's an easy way to convert a height map to a 3D model. All you'd need is to take a line drawing (with maybe a few shaded areas for contours), make a negative and import that as a height map. These types of cookie cby degroof - Let's design something! (I've got an idea ...)
Re: Cricut Automatic Paper Cutter - Hackable? - 15 years ago
Coincidentally, I just saw this Instructable on how to make solder paste stencils with Cricut.by degroof - RepLab Working Group
Re: Lathe Attachment for Drill Press - 15 years ago
Just to add fuel to the fire, here's a hobby lathe from Grizzly: It takes an electric drill as its motor and is intended for use with wood. I recently bought one of these and am in the process of modifying it. Note: It doesn't come with the drill. You need to buy either their drill or one that fits their collar.by degroof - General
Lathe Attachment for Drill Press - 15 years ago
I just saw this Instructable: It's intended for wood turning but it looks like you could do small metal pieces as well.by degroof - General
Re: General granule extruder design concepts - 15 years ago
A couple of random thoughts: 1. The auger designs I've seen have had the auger extend into the heated zone. Since the auger tends to conduct heat, the thermal break is compromised. What would happen if the auger stopped on the cool side of the thermal break? Would it still be able to push the granules ahead of it or would you tend to get packing problems? 2. The main problem with a piston desigby degroof - Mechanics
Re: Hopper/Auger granule extruder concept - 15 years ago
Wasn't there an experiment like this done a while ago? I have a vague recollection of there being a problem due to a metal auger conducting heat back toward the granules, causing clogging.by degroof - Mechanics
Re: The RepRap*R* - 15 years ago
Where do the air bubbles go in a wine press? Is there a way for it to escape out the top?by degroof - Plastic Extruder Working Group
Re: The RepRap*R* - 15 years ago
Oh! That kind of oil. My first reaction was "what the hell is an oil press". Makes sense now. Certainly looks durable enough to handle hot plastic.by degroof - Plastic Extruder Working Group
Re: The RepRap*R* - 15 years ago
Neat! Hadn't thought of using a wine press.by degroof - Plastic Extruder Working Group
Re: How to get extrusions to stick well? - 15 years ago
By the way, the standard way to make candy is to dissolve sugar in water and boil off most of the water. The reason the table linked to above works is that the boiling point of the solution changes as the concentration increases. Plain water boils at 100C but a 99% solution of sugar in water boils at 150C. As the water boils off, the boiling point increases, giving you a handy negative feedback lby degroof - Mechanics
Re: Subtractive toolhead - 15 years ago
You could even do a form of material recycling. Subtract from here, add to there.by degroof - Mechanics
Re: Real-View Desktop Scanner - 15 years ago
Sid: When I can walk up to one and say "my usual tea, please" and get a cup of Twinings Irish Breakfast, *then* it'll be like Star Trek. It always struck me as odd that Picard had to specify "tea, Earl Grey, hot" every time when that was the only tea he ever ordered.by degroof - 3D Scanners, Book Scanners, and Optics
Re: Real-View Desktop Scanner - 15 years ago
Yeah, I'm guessing it's a camera on one side and a laser line generator on the other.by degroof - 3D Scanners, Book Scanners, and Optics
Re: Real-View Desktop Scanner - 15 years ago
That's a pretty decent price. I might have to get one.by degroof - 3D Scanners, Book Scanners, and Optics
Real-View Desktop Scanner - 15 years ago
News here: and here:by degroof - 3D Scanners, Book Scanners, and Optics
Re: How to get extrusions to stick well? - 15 years ago
Yeah, melting sugar is a materials science unto itself. There are all sorts of different categories of melted sugar. Have a look here: I'm guessing what destroyer2012 has would be "caramel - medium brown". Might be interesting to create "candy" of various forms and see which ones have useful properties. For example, can you extrude "soft ball" sugar?by degroof - Mechanics
Re: Strap Perfect - 15 years ago
Of course, you could probably achieve the same effect with a couple of bent paperclips and some duct tape. But that's true of most things.by degroof - Let's design something! (I've got an idea ...)
Strap Perfect - 15 years ago
I just saw a commercial for these things: Including shipping and handling, these will run you just over $3 a piece. $3 for what's essentially a disc of plastic with some cutouts. It's unclear why anyone would need more than one, or even why the color matters, given that it's worn under the clothing. I figure the disc is about 2mm thick and 40mm in diameter, so about 2.5cc. So, about 350mm of fby degroof - Let's design something! (I've got an idea ...)