VDX Wrote: ------------------------------------------------------- > ... for the common laserdiodes from DVD-burner's > and other NIR-lasers (808 - 975nm) any transparent > material will work. > For BlyRay-diodes you have to look at the > transmission-specs ... I am bit a lost now. Are we still pursuing the inkjet head using piezo tecnhology?by casainho - Powder Printing and Selective Laser Sintering
VDX Wrote: ------------------------------------------------------- > ... but this all is also the main difference > betweend democracy and more centralized/predefined > political/sozial structures > > And one of the basic goals of reprap is > 'democratisation of tools' - so think again, which > options you'll have with a 'frozen' design, you > can start perfectioning untby casainho - General
VDX Wrote: ------------------------------------------------------- > Hi Casainho, > > i think it's more a kind of 'symbiosis' - the > basic design of the MakerBot-electronics comes > from reprap (Zach is/was in the core-team and run > the www.rrrf.org then) Right. Maybe that's because of all this I am being trying to explain, that Zach "leave" RepRap and created the company Maby casainho - General
Traumflug Wrote: ------------------------------------------------------- > Ah, yet another guy trying to enforce others for a > better world *sigh* The only way that I see "to enforce others for a better world" is to create a company like Makerbot. RepRap is dependent from such companies, as for example the electronics boards were just source from Makerbot and now from a few other companieby casainho - General
I still think this sucks because there are a lot of people working but everyone is working for his side. OpenSource community may be big when compared with small companies as Makerbot, such a big community would be able to make the best 3D printer, no? but that is not the reality! A small company/group of people (3??) as Makerbot ended up with one printer more accessible than the one(s) made by Rby casainho - General
nophead Wrote: ------------------------------------------------------- > > Would any common user do the same I did to build > a RepRap Mendel? take 9 months to build it and end > have the worst/userUNfriendly 3D printer of the > market? > > > Why do you say that? Why did it take you 9 months? It took 9 months because was very difficult to source all different parts!! Iby casainho - General
rhmorrison Wrote: ------------------------------------------------------- > And what about this quote: > > > Although RepRap Mendel is a bit complicated to > build if DIY, I am learning a lot and I love it! > Also I know that RepRap Mendel have the best > technology available on any Open Source 3D printer > ;-) > > > Oh wait... THAT WAS YOU on YOUR BLOG! Iby casainho - General
Cefiar Wrote: ------------------------------------------------------- > Casainho: Mendel and Huxley achieve different > goals. > > Mendel is designed to be expandable, possibly to > have multiple print heads and/or other tooling > options, whereas Huxley isn't. Huxley isn't a > REPLACEMENT for Mendel, and Mendel will still be > around for a while. That's why I think RepRby casainho - General
nophead Wrote: ------------------------------------------------------- > I just can see Makerbot here shinning, not > RepRap. > > The only thing I see better about the CupCake is > that it is easy to buy a complete kit and the > documentation is better due to very few variants. And software is much more "clean", easy to understand and use, don't you agree? I am being followinby casainho - General
SebastienBailard Wrote: ------------------------------------------------------- > Casainho, if you had one area you wanted RepRap to > focus on, and that you're working on, what would > it be? EMC support, and pc104 board-based > electronics? I would like to focus just on RepRap Mendel, as 3D printer. Make it simple and easy use for everyone, so all common mortals can take advantageby casainho - General
After many time building my RepStrap, printing parts for Mendel and finally build my Mendel, I asked on dev mailing list about "RepRap roadmap" -- seems there is no defined roadmap. Because there is no roadmap, I can't know what will be RepRap in next 1, 3, 5 years. Will RepRap improve and be userfriendly, being useful for people? --- I don't think so, because none developers expressed that inteby casainho - General
I think is unrealistic waiting for 10 developers that want to join for make such buy for that 10 nozzles, because we are not 10 and also because that nozzles are not proved to work. I am sure we can get much more traction when we have a print head fully working BUT even if with low quality. We need the print head + control board to work with RepRap Mendel electronics + software. As I said beforby casainho - Powder Printing and Selective Laser Sintering
Can't we get a cheaper way to make the holes? the nozzle? -- or can't the holes be larger than 0.05mm?by casainho - Powder Printing and Selective Laser Sintering
johnrpm Wrote: ------------------------------------------------------- > Here is a thread about nozzles, they are > fundamental to the head and can be a major > drawback to people without machines of any kind to > make them, also the body would need a lathe or > miller available, as you can see from the thread > we need ten people interested in buying a nozzle, > if you signby casainho - Powder Printing and Selective Laser Sintering
reifsnyderb, many thanks for support RepRap!! I bought from you my second "Reprap Machined Extruder Parts Kit" while the first one from Makerbot store. I would like to buy another, more robust, and for me the better and cheaper may be that one you did: test_nozzle.JPG Can you please sell it to me, 2 units (including 2 of that power resistors if possible)? send me a PM please. And I am also parby casainho - General
johnrpm Wrote: ------------------------------------------------------- > I do not know enough to know the answer, but if we > tap a bimorph we get a voltage output, and as we > are tapping it electronicaly I thought that its > own output may be adding to the signal, if you > know what I mean, as in the piezo transformers. Yes, I know and I registered that signal when kicking my piby casainho - Powder Printing and Selective Laser Sintering
johnrpm Wrote: ------------------------------------------------------- > If I applied a small force on the bimorph the > voltage reduced on the scope. > This may have implications on the way the disc is > clamped, with O rings at the very edge to allow > maximum deflection?, > also is the disc adding to the energy in some way > from its own output?. Maybe if you change the dby casainho - Powder Printing and Selective Laser Sintering
SebastienBailard Wrote: ------------------------------------------------------- > Sounds cool, casainho. > http:// reprap.org/ wiki/ Generation_8_Electronics ? Sounds ugly that name scheme -- we will market with other name for sure. We are working for the prototype, in the end, or we will be able to commercialize it and so people will have access to working and tested electronics or we wiby casainho - Powder Printing and Selective Laser Sintering
madscifi Wrote: ------------------------------------------------------- > Speaking of standard power supply transformers, I > tried using one to drive the piezo with a simple > transistor circuit and it unsurprisingly did not > work well. It boosts the voltage just fine, but > the pulses became triangles after passing through > the transformer. Ok, we have that problem, a squarby casainho - Powder Printing and Selective Laser Sintering
johnrpm Wrote: ------------------------------------------------------- > Found this device, SP4501, google the datasheet, > its a piezo ic, any use to us. That IC looks like it boost the Vcc up to 100V, on the Cint capacitor. Basically is a way to drive the piezo with "high voltage" other than using the transformer. Do we need such IC or transformer? -- before you wrote on wiki: "Amplitudby casainho - Powder Printing and Selective Laser Sintering
I updated the wiki page, on the ToDo list "The build a drive incorporating an arduino or add pwm to existing box" and I put a link to my my message showing the Arduino + Mosfet + piezo. VDX Wrote: ------------------------------------------------------- > Hi Casainho, > > ... i've edited the link to the document - you > have to insert a space after the documents name or > the sepby casainho - Powder Printing and Selective Laser Sintering
Ok, I will just buy a few different piezes, keep their reference and datasheet for later compare with the results. That document seems very good! I uploaded it to RepRap wiki:by casainho - Powder Printing and Selective Laser Sintering
I need to buy components from Farnell in a few hours. Does anyone know what piezos should I buy from this list?by casainho - Powder Printing and Selective Laser Sintering
johnrpm Wrote: ------------------------------------------------------- > I have ordered some from rapid piezo they are > 20mm dia and 6KH, may deliver smaller > amounts per pulse. > Casianho, I will do a model of the enclosed piezo, > although I do not yet know where to buy them. You (we all) can buy piezos here: (Americas, Europes, etc). I think all of us should use only oneby casainho - Powder Printing and Selective Laser Sintering
johnrpm Wrote: ------------------------------------------------------- (...) a repraped housing perhaps?. Why not start the design in 3D of that part? Are you meaning the print head? If you design, I can print, test and show in pictures. In next days I will need to buy components from Farnell - I found there a few piezos and I think I will buy a few units of this one: -- do you think is a gooby casainho - Powder Printing and Selective Laser Sintering
johnrpm Wrote: ------------------------------------------------------- > Casainho, > email me your address and I will send you the > printhead, Ok I will. But I would like that you get at a relative stable working design and send it to me on that time. We need to have both the same tools. after some head > scratching changed it for a tip132, then it > worked. Yeah, right. Maybby casainho - Powder Printing and Selective Laser Sintering
John, since I have the board with the Arduino + mosfet, if you need something more on that hardware and firmware, you can ask because I will be able to quickly do and test it. Don't forget to make one print head to me, so I can help you and we can advance more quick. Do you have a RepRap Mendel? I have one and I would design and print a support for the print head for Mendel. Also I can hack theby casainho - Powder Printing and Selective Laser Sintering
nophead Wrote: ------------------------------------------------------- > 27V supply, 25V FET, OK for an experiment but not > likely to be reliable. You mean the voltage limit of FDV301N mosfet? if yes, you are right, but that's the only mosfet I have in stock. Well, I have anothers but expensive ones (more than 1€) for use on my RepRap Mendel Heated Bed. People should find a better mosfetby casainho - Powder Printing and Selective Laser Sintering
I went and made my piezo buzzing with a signal of 24V, using my regulated power supply and one Arduino. I put a delay of 200us between each turn on/off of the piezo, making a frequency of 2.5KHz. I used the FDV301N mosfet because I had it in stock. Many others N mosfets should work. This Arduino can later be connected with 1 wire to RepRap extruder board and get a signal every time extruder getby casainho - Powder Printing and Selective Laser Sintering
johnrpm Wrote: ------------------------------------------------------- > I tried the head at 5 volts, I get an audible > sound from the head but no fluid flows, 20 volts > seems the lowest practical value at present. If 5 volts would work, it would be very simple :-) My suggestion is to get 3 x 9V rechargeable batteries, to put in series to get more than 20V. I hope the piezo uses smaby casainho - Powder Printing and Selective Laser Sintering