It is well hidden below the "Europe" sectionby anton - General
Hi Sebastien There already is a forum for a danish RUGby anton - General
Sorry, It does not appear as if PLA is the sought after method which can be used to "scrub" the environment of excess CO2. There is really no very longterm difference between landfills and composting, when considering only the CO2 released. The decomposition of the PLA polymers will release the captured CO2 to the surrounding environment regardless. In the landfill scenario if will eventuallyby anton - General
The articles I have found, all seems to suggest that even under anaerobic landfill conditions, there will be some degradation of material. The rate will of degradation will be drastically slowed down (I haven't been able to find information on how slow the process is) During the anaerobic breakdown, GHGs will be released, primarily CO2 and Methane, as well as the nitrates and phosphates, which aby anton - General
I'm having a bit of an argument with myself, related to the scope of this page, in particular with how much to emphasize other projects and machines, like RapMan, CupCake, MakerBot, BfB, Shapercube and friends. Personally I would prefer the page to be 100% on the RepRap machines, but given the scarcity of parts, some discussions of other means seems to be in order. I'm not really sure where theby anton - General
@MarcusWolschon I like the idea of dynamically adjusting the feedrate, but won't there be memory problems storing the height map of the bed? Also, where should the height map be stored when the machine is powered down? I could well imagine that scanning the height of the bed at any decent resolution would be time consuming.by anton - General
Forrest Higgs Wrote: ------------------------------------------------------- > > anton Wrote: > > > -------------------------------------------------- > > > ----- > > > Jeg kan læse og forstå svensk ganske udemærket, > men jeg kan desværre hverken tale eller skrive > svensk. Men da dansk og svensk er næsten det > samme kan vi måske prøve på denne måde.by anton - General
MarcusWolschon Wrote: ------------------------------------------------------- > So for bend Z-axes we could mount these > horizontaly, home to a specific edge and meassure > the distance to the edge? > As threaded rods are never perfectly straight this > could allow making > higher quality printers with cheaper materials. That was my initial thought, the firmware need to be moby anton - General
Ok, I have completed the first section of the wiki page, it contains information about HDPE, PET, ABS and PLA which I have gathered from various sources. To my surprise there is absolutely no "winner", there are simply too many unknowns, especially when considering the how varied the geography of the project members are. Although the quality of the numbers can be definitely be debated, at leastby anton - General
Forrest Higgs Wrote: ------------------------------------------------------- > anton Wrote: > -------------------------------------------------- > ----- > > @Forrest Higgs > > I don't think the wording of my questions was > > accusatory in any way, giving cause for an > > aggressive tone like that. I'm not a native > > English speaker, so maybe I did sound &by anton - General
Sebastien, I've started to gather some information relevant to the LCA of the materials used for the RepRap project. Would you prefer to have that information in a personal blog or somewhere on the wiki? Edit: Typos Edit: based on this: QuoteSebastien If you show us the numbers (and tack them up on a wiki page), Forrest will be more respectful. I've started out on a wiki page, containing someby anton - General
Sebastien, guessed my nationality correctly when he asked for prices on aluminum tubes in Denmark. I live some 60Km west of Copenhagen. It would appear that even though wood of almost any kind does have a rather big waste percentage compared to some other materials, it's a clear winner. The fact that wood contains no foreign chemicals to speak of, produces far less CO2 during production (Althouby anton - General
Just a quick update: Bang & Olufsen did a life cycle assessment of the chassis for the Beovision Avant TV set. They compared plastics, Aluminum combined with MDF and MDF as materials, and MDF came out as a clear winner: Although a LCA will be different from country to country, due to difference is how electrical power is generated, local availability of materials etc. It appears the MDF wiby anton - General
QuoteSebastienBailard Let's go numeric and look a simpler topic: I assert that Eiffel, being made from steel, aluminum, or wood, is ecologically better than Mendel, but I don't have numbers to back it up. Ok, I'll try to look into it, seeing that I have the time to do it :-)by anton - General
It was definitely not my intention to criticize the project, the vision or any members of the project, I sincerely apologize if my posts has given that impression. I believe the RepRap project is a very worthy project, and I am willing to chip in and assist where ever I can. Unfortunately - due to unemployment - my current financial situation precludes me from completing my current build, so prby anton - General
@Forrest Higgs I don't think the wording of my questions was accusatory in any way, giving cause for an aggressive tone like that. I'm not a native English speaker, so maybe I did sound accusatory unwittingly, in that case I would like to apologize, In case I didn't misapprehend myself, I would like to point out that too many people around the globe are concerned with the environment, for thisby anton - General
When I first started out with this project a couple of months ago, I had some serious problems getting to understand it. On a high level I had Adrians video explaining the vision, and then a bewildering amount of detail, some hidden in the wiki (I'm still not certain I fully understand that structure, I know there are two different wiki's but I have a dev** of a time, figuring out what goes wherby anton - General
You guys really should start doing your own laundry. It is the small metal spring from a clothespinby anton - General
@Sebastien: Ok, point taken about economics eventually forcing people away from plastics made from mineral oils. There is however a lot of research going on in the reprap community, which does raise some concerns, e.g. there is a talk about Rose's metal (lead) and Wood's metal (lead and cadmium), both metals are subject to RoHS. Further more, I see a lot of suggestions for using materials whichby anton - General
The purpose of this thread, wasn't really to gather information relevant to researching the environment impact, but an attempt to get a debate going. I have no doubt that everything pans out for reprap, it will have an impact on society similar to the cotton gin and mass production. I do however not see a compelling reason why the reprap should reduce the shipping of materials, as I see it as aby anton - General
Lately I've come to thinking about the vision of the reprap project, about critical volumes, a reprap in every home, and so on; and it occured to me, if the vision and perspective of this project is to have a significant impact on how things are produced in the future. Then I think we also need to evaluate the environmental impact of the reprap. When listening into some of the debates in variousby anton - General
@Arvin, the translated page hasn't been created yet, so Wikipedia assumes you want to create the page, and if you aren't logged into the wiki with a known user account, you are not permitted to edit the page.by anton - General
Arvin Wrote: ------------------------------------------------------- > @Sebastien- I have attempted to edit the wiki with > no success. > > Now I am concerned because I visited the WolfStrap > page, clicked English and got the following > permission error. > > "You do not have permission to do that, for the > following reason: > You are not allowed to execute theby anton - General
I think a probe for measuring the inaccuracies of the bed, both in terms of height/bending, but also in terms of mis-allignment of the X-Y axis is a great idea. I'm a bit worried about the precision of a cheap IR range finder, but Nophead dug up a link for something which could be used as a homegrown probe: Nopheads original blog: The probe, which inspired Nophead Maybe that could be adaptby anton - General
sircastor Wrote: ------------------------------------------------------- > Stoffel15 Wrote: > -------------------------------------------------- > ----- > > @sircastor > > > > i know, you cant translate my page with google. > > Thats the reason i do it in german.. I'm not > > rude... but i am not able to translate. My last > > English learning is >by anton - General
Since starting to learn about the project, I've had to learn a few things, amongst others about stepper motors and drivers. I've tried to summarize what I have learned into a kind of FAQ page about stepper motors as they relate to Reprap. I'd like to ask for help about: 1) Is such a page needed, if not, it's ok to delete it 2) Is the information accurate? 3) Is there information which needs toby anton - General
@VDX Great, thanks for the explanation. So given that most X, Y and Z axis engines of the Mendel are probably overpowered, it makes great sense to do micro-stepping. How about a McWire, which would be used for light milling, wouldn't the torque required to hold the bed in position require either higher torque motors or refraining from micro-stepping? ps. Your motors sounds pretty cool, but it aby anton - Stepper Motors, Servo Motors, DC Motors
Microstepping comes at a cost: QuoteElectric motors and drives: fundamentals, types and applications Mini-stepping is a technique based on two-phase-on operation which provides for the subdivision of each full motor step into a number of ‘substeps’ of equal size. In contrast with half stepping, where the two currents have to be kept equal, the currents are deliberately made un- equal. By correctby anton - Stepper Motors, Servo Motors, DC Motors
dissidence Wrote: ------------------------------------------------------- > i am starting to wonder how hard it would be to > get google to start to add some of the code needed > to sketchup so that it would be less hassle to use > it for the reprap project. > > i am thinking summer of code project I believe sketchup is closed source, and it doesn't run on linux, I don't knowby anton - General