QuoteAs should JB weld etc Haven't people been having issues with the JB weld perishing over time, though?by Ru - Plastic Extruder Working Group
Quoteyou screw up a circuit on a PCI card you are out a MOBO or more. Making your own PCI cards seems like overkill here, when there are plenty of off-the-shelf IO cards available. As for frazzling your PC, I did mention optoisolators alreadyby Ru - General
It also suggests that the price may not remain that low in future (Special Introductory Price), and for only 5 bucks you may as well grab one on the offchance it works. It isn't like you'd be losing out much if it didn't.by Ru - Controllers
QuoteCan I use Exhaust Cement (rated to 300C) for repairing car exhausts instead? That sounds like a sensible sort of idea. Give it a go and let us know how it works out I don't know if anyone has found a really satisfactory material yet, in terms of price and being easy to obtain.by Ru - Plastic Extruder Working Group
QuoteThe bot and extruder parameters are on tabs at the bottom. Argh, so they are. I was just reading it as simple HTML table (with an inconvenient scrollbar), not some horrible google document. Oops.by Ru - General
QuoteReprap software params are listed here: Those are just UI parameters though, and as such wouldn't have any impact on the build. I don't know if skeinforge shares any build parameters with the java host, but it is pretty well documented from what I've seen and so definitely worth a look.by Ru - General
Irritatingly, whilst there are a handful of places that talk about making your own starch-based plastic, nowhere a) gives any serious detail into what actually is or b) tries to remelt it. One page makes reference to curing the stuff in an oven to harden it up which sounds quite thermosetty to me, but there are a lot of tantalising references to 'thermoplastic starch' across the interwebs... thiby Ru - Plastic Extruder Working Group
Ahh. I hadn't thought of that one, clearlyby Ru - Mechanics
QuoteIf it's flexible you have the problem of how you hold it down If you had some rigid strips (presumably of plastic or wood) that were the width of the bed, you could lay them across the edges of your fabric raft, and clamp or screw the ends down at the very edge of the build area. So long as neither the bed or the retaining strips were too flexible, it should clamp the fabric in place.by Ru - Mechanics
QuoteAny one knows if this is a thermoplastic, i.e. if you can re-melt it after production? I'm going to have to guess 'no', based on zero evidence Nature seems to be full of things that set and stay that way, and low on remeltables, wax and pine resin aside. And I don't think you'll find a whole lot of waxy or resinous chemicals in a potato. But I'll let someone else do the hard work of provby Ru - Plastic Extruder Working Group
QuoteBtw CAN have a non-negligible license-fees. Only if you're making a hardware implementation. By purchasing a CAN-capable IC, you are buying the capability from a manufacturer who has licensed the protocol from Bosch. You don't have to pay any more. You do have to pay if you make your own implementation in a CPLD or FPGA though, which is something I am interested in using in the future. Quby Ru - Controllers
QuoteI think we can design a time-efficient process, though. Don't forget that casting is used for mass manufacturing. Things like little bits of plastic would presumably be injection molded. This is a pretty speedy task, once you've created the molds... but this sort of manufacturing is probably a little out of our league Resin casting of the sort that's desribed in the reprap wiki would appeby Ru - Mechanics
QuoteWell I was imagining a modified design which requires no overhangs (or limit it to overhangs which could be created by gap-spanning as Nophead has displayed) Now I think about it a bit more, I guess a no-overhang version might be okay. You might have to make a few compromises which might limit the strength of the link, but I guess you can heavily over-engineer the whole thing and not worryby Ru - Mechanics
QuoteThe chips that Dallas produce already have the protocol built into them. A network protocol stack has many layers. 1-wire provides a physical layer, and a data-link layer (as it provides per-device addresses) but that's all. It is quite minimal, which is good for various reasons, but it doesn't do everything for you (as far as I can tell, feel free to correct me if I am wrong!) The key thiby Ru - Controllers
QuoteI seem to remember having a K'NEX toy with similarly shaped plastic chain link I know there are also lego counterparts. IGUS 'enerygy chain' also springs to mind, though that is for a slightly different purpose it has the same structure. The overhangs are the difficult bit... you could perhaps use some scaffold supports to hold them up, but I for one do not fancy removing support struts frby Ru - Mechanics
Quoteall the attached devices hang off a single wire Well, that'll teach me to relay on my somewhat imperfect memory rather than having a quick peek at wikipedia or whatever. It certainly looks interesting now, though it would require the microcontroller for each slave device to implement some sort of useful networking protocol; something that the CAN interfaces already have. I also have no iby Ru - Controllers
Quote I can't really comment on controlling motors since as I said its not my area, it seems sucky to have a full fledged processor that should be to do anything a microchip does (including emulate it) but not be able to have it drive the motor but maybe that's just how it is The key phrase is 'hard real time interrupt guarantees', or somesuch. A dedicated microcontroller can be programmed suchby Ru - General
QuoteI understand you need a basic circuit board to distribute power to the motor/heater, although USB 3.0 is supposed to allow devices to draw as much power as they want You don't need any such board. Reprappers generally use a bog standard ATX power supply, and connect boards directly to that to draw on the 5v and 12v power lines. USB 3 may be able to do all sorts of things, but what I doubtby Ru - General
QuoteRu: For CAN support there is specialised microcontrollers (I know for sure, that mirochip produces pics with built-in CAN support). It would be preferable not to have to use extra ICs, especially if they have to be SMT ones. I've not stopped to look to see if this is the case, but it seems likely There are plenty of things with CAN support out there. One small beef I have with the protocby Ru - Controllers
QuoteCAN which is designed for Vehicles. But that is probably overkill. My interest in CAN is that as it is a bus-based network, adding additional devices is not terribly difficult. All the alternatives require one more more additional IO lines per attached device.by Ru - Controllers
QuoteRu, I disagree. While it is true that arc drawing codes aren't used right now and certainly don't need to be, I don't think that they're necessarily useless. Nor do I. QuoteEnrique's script has a corner-filleting option that would be a natural fit for the arc codes That's an interesting thought that I hadn't considered. You are of course quite correct. QuoteAlso, standards compliance isby Ru - RepRap Host
QuoteI don't get this. If you graft a little SD card reader onto your baby reprap machine you could hold the complete parts descriptions of dozens of generations of reprap machines. A 1 GByte SD card costs about $10 and they get lots bigger than that. Very true. But not what the original poster said. QuoteA Pic 24F would do the job pretty easily and handle the display and keyboard Now that woby Ru - General
QuoteOkay, drill a small hole for the shutoff valve and it leaks. So we drill a bigger one and it doesn't? Well, if the problem was caused by the filament oozing around the side of a poorly centered valve wire, then yes. A valve wire with a bigger diameter than the nozzle would be less likely to leak, surely? QuoteThis seems like a lot of trouble and extra complexity to go to just to avoid haviby Ru - Mechanics
QuoteSo that's that about the bigger chip. I also have a few questions about the use of multiple chips. If we wanted to wire up multiple ATmegas (like, say, multiple ATmega168s or your old ATmega168 and your new Sanguino and your brand new ATmega2560), how exactly would that work? The apparently short-lived dual arduino setup used a powercomms board from the gen 1 electronics to link the host Pby Ru - Controllers
It seems unlikely at this point that arc drawing codes will be used for filament deposition. This is due to the fact that STL models are inherently faceted, and an extra line-segments-to-arc processing stage would be required to generate curves. There's no real need to do so right now. The arc drawing stuff has therefore not been exercised or tested (or even looked at!) by most people, and nor wby Ru - RepRap Host
Have you read (assuming you're using arduino electronics)? Also, might be useful, though I haven't peered at it closely enough to tellby Ru - Controllers
QuoteEven worse: if it can only print darvin, it'll get's useless if Mendel is coming around. Because firmware must be carved from stone and is immutable! The flaw here is that building a firmware which contains STL data (or even magically preprocessed data, similar to what goes into Forrest's EEPROM buffer) is going to be BIG. Waaaay bigger than will ever fit on a little uC. There is also thby Ru - General
QuoteApparently the original design tended to leak Ahh, I must have missed that one. I'll go back and read more carefully.by Ru - Mechanics
We seem to be coming full circle here. I'm curious; what is wrong with the original solenoid valve design that so many complex alternatives have been suggested?by Ru - Mechanics
There are laser cut repraps made from plywood and plastic, to two slightly different designs, I do believe (but I could very well be wrong). I can't recommend one over the other, as I've had experience with neither As for using wooden rods rather than metal ones... hmm. I'd be mildly skeptical about that, but there's no reason why it shouldn't work. You would need to lubricate the rods which sby Ru - Reprappers