gvigelet Wrote: ------------------------------------------------------- > A cheap alternative to adding I/O to the Raspberry > pi would be to use the Cortex M0, they are less > than $2.00 and can be used to expand the I/O of > the Pi. The discovery board for the M0 is around > $12.00 and there is a good amount of I/O that > could be exposed and use SPI to communicate with >by bobc - Controllers
glyn Wrote: ------------------------------------------------------- > What is special about mirror glass? To get a good reflection the glass is very flat. Similar goes for window glass. Can be cut to size, but may also crack if stressed by uneven heat. Any other glass for shelves, mats or whatever don't need good optical properties. These are usually tempered glass which withstand uneven heaby bobc - General
Looks great, but for a similar or lower price you could put on a 32 bit ARM running at 100MHz, wouldn't that be a useful step up in performance?by bobc - General
I think I will have a go at building a vacuum tool head, it looks quite straightforward. A dual head with solder paste extruder would be useful. Initially it might be human assisted to check if the basic mechanism works ok. To keeps things simple, I would present components in trays with small pockets to hold the components. It is extra work for the user to populate the trays, but I figure thisby bobc - Pick-and-Place Electronic Assembly (and robots!)
There have been several discussions about improving the comms protocol between PC and Reprap. AFAIK, the "standard" protocol is still the GCode protocol described on the wiki , and the only host/firmware to have implemented a new protocol is the Repetier firmware. It seems that the current protocol is "good enough", and there is insufficient momentum to change it. However, I'd quite like a protby bobc - Firmware - experimental, borrowed, and future
The Raspberry Pi has got everyone buzzing wondering what they can do with it. If you go bare-metal, it is a fast but cheap ARM board. It is grossly overpowered to drive steppers, but for £30 that doesn't matter. Without Linux, you lose a lot of goodies - network, USB, GPU which need work to replace. With Linux, you have the real time problem, but you probably only need a custom device driver toby bobc - Controllers
sarel.wagner Wrote: ------------------------------------------------------- > Bobc, thank you for sharing your opinion with us, > twice. Do you have any other contribution to make > apart from that? > > EDIT: Just to make sure ya did not miss this part > here it is again: Here is one definition of > standard: "something considered by an authority or > by general consent aby bobc - Developers
I've also found using the beta value from the datasheet gives very inaccurate results, as much as 40% out at 300deg. The beta formula is only good for the specifed range, typically 25-85 deg. If I need to use a formula, I would use the Steinhart-Hart equation. Admittedly it requires a bit more math, but I borrowed a spreadsheet from a colleague But with 3 data points, it calculates S-H coefficiby bobc - General
This effort to classify 3d printers into "standard" sizes is pointless, because print objects can be any size. This is completely the opposite of 2d printers. Standards are useful where they promote interoperability. For printer users, that means filament and Gcode, all the rest is pretty much irrelevant. Developers create from scratch, and don't build printers like assembling lego. The problemby bobc - Developers
As far as standards ideas go, this one is quite pointless. No one cares about printing standard sized cubes. And for God's sake, use metric. It's um, an international standard, you know?by bobc - Developers
Traumflug Wrote: ------------------------------------------------------- > Not the current move and not a few later ones, as > movements can be too short to give the time to > re-precalculate everything. Some movements are one > step or even zero steps, one never knows what's > coming in. pcb2gcode, for example, does one > movement for every 0.04mm (600 dpi), a stress test >by bobc - Developers
Traumflug Wrote: ------------------------------------------------------- > Is the GRBL/Marlin path planner safe in this > regard? Yes, path planning is done on all commands received to date, so that the last move in the buffer will decelerate to zero. A new command received will cause the path to be replanned accordingly. > Also for the case where the path planner > updates a movemby bobc - Developers
richrap Wrote: ------------------------------------------------------- > I'm setting up ttyUSB1 in the terminal window > using stty and it does not like 250000 as an > argument but fine with 115200 > > Looking at this page stty does not seem to like > 250000 baud? is that correct? > > Anyone else have Pronterface running in Linux at > 250000 baud? Do I need new FTDI dby bobc - Developers
JazzyMT Wrote: ------------------------------------------------------- > I'm one of the newer lurkers here and am currently > working on a 3D printer and electronics offering > with the intent of (hopefully) starting a business > with it too. My partner and I are still very > ambivalent on the issue of open source development > - having seen some of the designs ripped off in &gby bobc - General
nophead Wrote: ------------------------------------------------------- > It seems to be your point of view that open source > should not be used as selling point until the > source is actually released. Fine that is your > view, but nobody else in this community seems to > share it, so move on. Well now, I agreed with him, so not quite noone. Kinda heavy handed deleting the threadby bobc - General
richrap Wrote: ------------------------------------------------------- > Anyone else have a RPi yet? Still waiting for RPi to be delivered. > > I have pronterface installed and working on it, > next step is to get the printer working and then > get it to be command driven via the Ethernet > interface - I'm going to need some help with that > bit. >> "get the printer wby bobc - Developers
gerards1111 Wrote: ------------------------------------------------------- > It's all about making money, even reprap. Just > because it's hidden under the guise of being open. > The difference is stratasys pay the ones who help > create the final product. In this setup everyone > contributes but the main ones make the money. You are sounding like a corporate shill. It is difficuby bobc - General
Todd Grimm Wrote: ------------------------------------------------------- > I am the author and Stratasys did not write, edit > or direct any of the content. It is all about the transparency isn't it? People today are aware of marketing techniques like astroturfing, and are right to be skeptical. How and why does anonymous guy on the internet get hold of a $10,000 printer not yet on saleby bobc - General
Looking forward to the kickstarter! If I could get a CNC and a dual extruder that would be real nice. Is it possible to ship as a kit, or does it require skilled assembly?by bobc - General
Madkite Wrote: ------------------------------------------------------- > And it kind of sounded like business attempting to > control our individualistic open source > development. For what ends and who's benefit? > Well, Jarkko fails to mention, is that he appears to be closely involved with a startup company trying to get into the 3D printer business. They are looking for employeby bobc - General
CC is a subset of copyright and really only useful for artworks like writing, photos painting etc. It can not be used to protect things that are not covered by copyright, which mostly excludes engineering designs apart from some specific types. Some people are not happy with the idea of CC licenses, and it is somewhat confusing for Thingiverse to have them as options. But I guess since there isby bobc - General
LOL, just what I thought, "3D printing would be so much better if a super-committee took charge of it" - not! I can't figure out what the organisation is actually going to do, it looks like it was written by a jargon generator. Surely, the first rule when trying to create an umbrella organisation is to consult the community first and see what their goals are. Then draw up some plans based on thaby bobc - General
I guess you will need more than an Arduino to control that, maybe one of the ARM boards could do it. Alternatively do the number crunching on a PC and output precomputed moves to an Arduino. It is an interesting challenge to write the control algorithms. It is a similar task to the 5 axis CNC machines. The software for those is $1000s, I don't know of any open source software.by bobc - General
The printer you describe is more in the "expert" class then the beginner class. You seem to be looking for professional quality without the cost. I think it will be a big challenge to make a printer that larger with a high accuracy (although you don't specify what accuracy is required). I am preety sure there are no designs around that would be suitable. The idea of printing smaller parts is preby bobc - Developers
I don't think you normally want any movement between the extruder and hot end, they will be tightly bolted together. In which case, a force sensor will read that as a high load. You then want to sense a small additional force when the extruder hits the bed, which makes for a difficult combination of range and sensitivity. This particular sensor has a low temperature range, I don't think it wouldby bobc - Developers
Multiple materials/colors: the new AMF format is designed to handle that. At its simplest, it is a replacement for STL. At it's most complex, there is a color for each vertex, however it is likely to be useful in the near term to represent multiple volumes with different single color/material. If we can get past the chicken/egg problem, I think there is a lot of potential for this.. I am thinkinby bobc - General
nigel_mck Wrote: ------------------------------------------------------- > I started with ABS and found it extremely easy to > get going, my first print was pretty decent and > the quality quickly improved after that. I have > found that there is barely any smell with the > current batch of ABS I've been using. I switched > over to PLA just today and found it extremely > finiby bobc - General
Chelsea - QU-BD Wrote: ------------------------------------------------------- > I had always thought it would be really cool to > have a second extruder have a much larger diameter > nozzle that was specifically used for doing infill > quickly, with a fine nozzle for the exterior. Of > course layer heights would be different but it > could be corrected in software. That seemsby bobc - General
misan Wrote: ------------------------------------------------------- > I share your perplexity. This particular socket > may hold male pins too: > > ble-Male-Pin-Connector-2-54mm-Good-Quality-DIY-New > -/120833703856?pt=LH_DefaultDomain_0&hash=item1c22 > 3fffb0#ht_3424wt_822 Right, but I think what you call the socket I would call a housing! For UK people (maybe EU also)by bobc - General
Conventional wisdom is that glass cracks when heated, but a lot of people use regular glass and I don't hear many reports of problems. It seems the key is even heating and avoiding stressing the glass. If it does fail, it may crack but since it is lying on a bed you don't get pieces flying everywhere. Tempered glass is heat proof, but can not be cut once tempered, so you need find the right sizeby bobc - General