Satuna Wrote: ------------------------------------------------------- > XP stops before > every curve for a little while which is enough to > dump up the material. Maybe my XP is full of > stuff... dont know... I've been using XP and noticed the same thing.by degroof - RepRap Host
I'm in the process of rebuilding my extruder (yes, again). Current state is: - PTFE barrel is 1" dia and 3" long - heater barrel is also longer to allow more of it to be threaded into the PTFE - still using a pipe clamp around the PTFE - cut a new extruder body out of a plastic cutting board (the old one was warped) - wider PTFE barrel allowed me to screw it directly to the extruder body - ran aby degroof - Mechanics
Anyone have a good supplier for small quantities of ABS filament?by degroof - Plastic Extruder Working Group
According to that blog page [9x20lathe.blogspot.com] , it's 7mm diameter and 40 threads per inch. It'd be tough to find a die for that. Might be easier to buy just the collet and make your own nut by drilling a hole in an 3/8" acorn nut. (thinks about it for a bit) OK, try this: - take a 3/8" carriage bolt, cut off the head but leaving plenty of unthreaded stock - drill a 3/16" hole in the thrby degroof - Mechanics
winchymatt Wrote: > I would like to find a collet chuck that I could > fit to the 1/8" spindle shaft, anybody know of > anything suitable? > How about picking up a Dremel collet and collet nut set (part# 4485)? A piece of round stock, drilled and threaded, could be used to attach it to the spindle. Looks like this guy [9x20lathe.blogspot.com] managed to get one to fit.by degroof - Mechanics
Can't find any docs on the part number. Closest I could find to any info at all was that Gettys appears to have been bought out by Elwood:by degroof - Mechanics
Yeah, that's my take on it. The Darwin is roughly equivalent to the Altair or Apple 1. I did some figuring and, adjusted for inflation, each of those would go for about $2000 today.by degroof - General
I can't see the item on ebay (corporate firewall) but I can think of 2 possibilities: 1. No one's bidding on it, in which case, posting the link here probably wasn't the best move. :-) 2. They might gouge you on shipping.by degroof - Mechanics
I went to matweb and looked for materials with a melting point below 60C and a density around 1.3 g/cc. Two materials caught my eye: Sodium acetate trihydride (aka "hot ice"): melting point 58C, density 1.45 g/cc. Glycerin (aka glycerol): melting point 18C, density 1.26 g/cc. Both of these are fairly cheap. Glycerin's probably the easiest to handle. Not sure how either of these would affect aby degroof - Plastic Extruder Working Group
Ha! I'm guessing an MDF bed wouldn't be quite durable enough for that. :-)by degroof - General
Yeah, the DigiKey thermistors are inexpensive but they're also 5% tolerance. You can't use the spec'd beta and Rz values as-read. Each one is slightly off spec, so you'd need to go through the whole measurement process for each. I ended up buying 5 of them, calculating their individual beta and Rz values, and taping them to scraps of paper with the values scribbled on them. Still, at $0.80 a piby degroof - Mechanics
I get a daily Google Alert with links to new pages containing the word "RepRap". There were a lot today: hogblog: - I like the "drawing hands" image at the end of this one itscatt: thekit: alltoosimple: As far as I can tell, these were all posted yesterday.by degroof - General
I was trying to come up with cheap ways to recycle plastic into 3mm filament. Had this vague idea of taking an electric deep fryer and drilling a hole in the bottom. The nice thing about them is that most have an adjustable thermostat and are made of cast aluminum (easy to drill). Not sure how to force the plastic out consistently, though. I've got a soft-serve ice cream maker that has a mixingby degroof - Mechanics
Yeah, I do the same thing. If it's a chip I know I'm going to swap out frequently, I'll double-socket it so that, even if I break a pin, I'm only out the price of a socket. I did this with the PICs on the Darwin boards, for example.by degroof - Controllers
How about some sort of wax (paraffin, bees wax)? There might be something close to the right density that's also liquid at a reasonable temperature. Not sure how it'd affect adhesion. Probably depends on the type of wax. It'd be nice if plain old candle wax turned out to work.by degroof - Plastic Extruder Working Group
I like the graphite idea. I remember, as a kid, making an arc lamp from a pencil. Syringe needles might be interesting. The one you've got there looks like it's about the same diameter as the pencil leads. I remember seeing a syringe made entirely from stainless steel recently. I think it was a marinade injector for meat.by degroof - Plastic Extruder Working Group
Ran across this yesterday: I guess the concept is that you can use the board for development and testing, then transfer the chip over to a custom board. Would that be of any interest?by degroof - Controllers
Here's the video: "New Apple iBrush!"by degroof - General
Well, it's mainly because Vik's the only one who's managed to get one working long enough to print out a few parts. By the sounds of it, there are about a dozen or so people who are almost to that point. There's an effort over here: to get a handle on how many RepRap builders there are and how far along they are.by degroof - Reprappers
It got someone's attention, that's for sure. The number of hits on my blog has gone up and a lot of the referring pages are google searches on "reprap kit".by degroof - General
There was a similar incident in January involving Digg. You get four sorts of users: Ones who click through, read the article, check references and comment. Ones who click through, take the article at face value and comment. Ones who read the headline and comment. Ones who just make stuff up. I'm guessing most of the ones who stick around and register on this forum are from the first group. It'by degroof - General
First thing I thought of when I saw it was this:by degroof - General
I imported the file into Art of Illusion and then exported it again. The exported file works with RepRap. As far as I can tell, the major difference seems to be the number notation. The first file has lines like this: facet normal -1.000000e+000 0.000000e+000 0.000000e+000 outer loop vertex 2.000000e+000 2.200000e+001 2.000000e+001 vertex 2.000000e+000 2.200000e+001 0.00000by degroof - General
Anyone tried using PEEK (polyetheretherketone) in place of PTFE for the extruder?by degroof - Mechanics
Another thought: There are 3 different transistor packages (that I know of) that have a cylindrical shape: TO-5, TO-8, TO18. Their diameters are roughly 8mm, 14mm, 4mm respectively. The heat sinks for these tend to be an upside-down top hat shape that press-fits onto the body. This might make for a cheap, pre-made barrel heat sink.by degroof - Mechanics
Another thing I did at one point was leave open the space normally occupied by the PTFE barrel. (i.e. drive body -> open air -> heater barrel) In case anyone had any thoughts on doing this, I can categorically state that this will not work at all. It did pretty much what you'd expect. As soon as the filament heated up, it melted down the outside of the heater barrel. Great thermal propertby degroof - Mechanics
I wonder if something like stainless steel tubing might be viable. If I could find some with an I.D. of about 3mm, I might try that. All you'd need to do is cut a piece and thread the ends.by degroof - Mechanics
I used to work for a graphics card company and we did some interesting things with line drawing algorithms. Steppers have an added complication of needing a specific speed, rather than "as fast as possible" with graphics. One interesting algorithm I remember was one where each axis had its own accumulator. The idea is that you repeatedly add (or subtract) numbers to the accumulators and move thby degroof - RepRap Host
degroof Wrote: ------------------------------------------------------- > I've got a piece of 3/8" diameter bisque alumina > on order Update: Got the bisque alumina on Friday. It's relatively easy to machine but also pretty tough. I cut a piece, drilled a hole through the center and threaded both ends. I attached the heater barrel to it using a threaded rod coupling and warmed it up. It doeby degroof - Mechanics