SouthT I agree. The chinese way is odd - I do run 2.7V motors at 24V no problem. But, I don't know why they don't just raise the rating. Incidentally, the fuses on RAMPS are rated for 12V, but you can run them at 30V supposedly. *** Disclaimer: With constant/max current controlby Simba - Developers
redreprap Wrote: ------------------------------------------------------- > hmmm a CNC beast VDX ? agree....with NEMA 34's of courseby Simba - Developers
I'm certain the Decapede+ expansion can handle it. It \designed for this purpose. You also could straddle the nozzle heaters to a common circuit on the main output (20A) So if 5A = 200 degC, put them all to say ~3A for a default on mode, then you can have 8 extruders powered on PID with only 2A each... just a thought if your temperature between extruders isn't going to vary by more than ~ 80C.by Simba - Developers
Good points. The notes on delrin explosion is far fetched, only that you can never be too careful when its your fault someone gets hurt...I got this tip from a polymer injection company. Does anyone know what a good price point would be to ask a machinist for? I'm thinking of eventually setting up a (Read: dirt cheap, low profit) reprap house and wanna buy them in bulk. I assume somewhere betby Simba - Developers
I'm sure you've seen the finishing kickstarter, which recommends MEK?by Simba - General
redreprap Wrote: ------------------------------------------------------- > like you said, the motor has its own inertia to > overcome, and like nophead has explained in his > own findings, each model of motor needs a specific > drive to get it to work optimally. otherwise, you > get miss steps or steps skipping. (you prolly need > to see my blog #006th post) > > nophead sby Simba - Developers
uGen Wrote: ------------------------------------------------------- > That is interesting to hear. I knew that UHMWPE > doesn't absorb air humidity like PA does, but did > not have any information about other fluids. Any > reason why I should not use PTFE (besides > obviously not working better than the unlubricated > bearing)? > One of my goals was to have a completely wet &by Simba - Developers
These are the kinds of things to discuss. Technically the processing is done on the chip entirely, the arduino just needs to tell it where to go (it has on board position tracking PER stepper motor). In fact, the same board does the acceleration coding locally too! So I think it is possible to even lower gcode size. However, I don't understand SPI yet to extrapolate more than this. Can you tby Simba - Developers
What do you guys think of SPI interface control with 3A output and 1/128 microstepping? "L6470dSPIN: Fully integrated microstepping motor driver with motion engine and SPI" I think the microstepping is kinda overkill, unless you have several amps and lots of torque. Even for the purpose of smoothing movement, wouldn't the motor inertia dramatically counteract the "springiness" caused by motorby Simba - Developers
unlimitedbacon Wrote: > I'd like to know what everyone thinks of > multiplexing the stepper drivers. By adding cheap > multiplexing chips to the drivers, you would use > much fewer pins on the microcontroller and you > could hook up as many drivers as you want* using > one big ribbon cable. The only problem I can see > is that you would have to switch between them > extreby Simba - Developers
konwiddak Wrote: ------------------------------------------------------- > Look at this unlimitedbacon: Fancy that, we feel the same: You honor the idea very much as it was only just finalized a few days ago and I'm really thrilled to know there are people who want it before its ready! We hired two electronics guys to figure out that indeed, it only takes 3 pins from arduino per stepstiby Simba - Developers
What is the best way to sink heat possible? A wide thin hot plate exposed to open air convection. OF course there is not enough power to keep this thing running really hot. By comparison it is like running your induction cooktop on lower than the lowest setting. Anything over 115C is difficult, but possible. Try insulating with fiberglass instead of wood. Also, running the other hot end withby Simba - Reprappers
OMG Integer error, that has to be it More evidence for relative position.by Simba - Reprappers
Okay, seems fair. Thanks for your support!!! PS, we recently revamped the expansion board. IT is now up to the user to detemine the safe output levels. Each of the 8 fets on the reprap expansion can individually put out 5 amps - this was only intended to run 2 extra extruders, and some fans (but not 8 extruders, 5A each). In fact, the entire board is versatile in that you as the user have toby Simba - Developers
Just when I thought I was up to date.... I don't get it : )by Simba - Developers
UHMW is not most plastics. It can't be thermoformed. It can be thermodeformed. At least, that is my current understanding, that the theoretical actual glass transition temperature is above the charring point of this material. This is why most UHMW is sintered from powder. IT is also why "extruded" UHMW tends to look funky. But it is also what gives it utility as a bearing. Were it to heaby Simba - Developers
Very slick space age design.by Simba - General
Thanks for the input (and esp the name, uGen!) Please see the full details here: and updates here: I propose around $250 for the board + 10 stepsticks + the reprap expansion for those referred to us by this site.by Simba - Developers
try arduino 022?by Simba - Firmware - mainstream and related support
still unable to convert SD card files over to Arudino 1.01 The error messages remaining are: "Sd2Card.cpp: In member function 'void Sd2Card::chipSelectHigh()': Sd2Card.cpp:145: error: 'HIGH' was not declared in this scope Sd2Card.cpp:145: error: 'digitalWrite' was not declared in this scope Sd2Card.cpp: In member function 'void Sd2Card::chipSelectLow()': Sd2Card.cpp:149: error: 'LOW' was not decby Simba - Firmware - mainstream and related support
decapede is cool that in fact we realized the entire board is completely reworked and has practically no ramps element in it, we did use their circuit design for thermistor, so I don't consider this a true RAMPS board anymore, a new name is fitting. For those who asked, we just added the expansion board design. It has :EIGHT thermistor outputs!!! :EIGHT addition FETs capable of 1A each @ 24V aby Simba - Developers
hendo420 Wrote: ------------------------------------------------------- > Has anyone tried printing with a ferrous metal > powder infused filament and a magnetized print > bed? > > With the proper set up you could print upside down > or even in space. > > > Or magnetic filament. Print your own fridge > magnets with the magnet already integrated. I can > also tby Simba - General
You have a lot to learn about patents - there is a great deal of confusion here. Not all is what it seems. For example, the lawsuit against formlabs was baseless, they only did it because it was the end of their patent life. Its just patent and legal play tactics. Also, don't read a patent without reading the specification, otherwise, it looks like everything in the world is covered and patenby Simba - General
VDX, I love you work but I wish I could relate to it on an "I could do that too" sort of level. : / I'm a simple man, I just want to melt and stick things together. Lasers and vacuums and metal evaporators just remind me of the clean room I worked in, where everything was big, expensive, and broke down all the time. The beauty of reprap is its simplicity, surely I can find a way to do it witby Simba - General
Aren't the abrasives plastic pellets themselves? I really want to try this... Please let us know how it goes!by Simba - General
There have been legit studies. Roughly compared to injection molded parts: Tensile strength is 25% in the z direction and 50% in the others. This would be good, however fdm is highly dependent on heat airflow and part size, I. E. This property will be inconsistent as hellby Simba - General
You guys (and/or gals), metal printer at home is a holy grail of 3dp. Let be honest, plastic parts can be fragile, light, and leave for want. Metal is far more attractive for many reasons, and let's not forget that is conducts heat and electricity well. From what I've gathered there is enormous interest and people have not started the conversation because it seems so far out. But just lookby Simba - General
No need BTW, a sharpie is dye. I know because if you hit it with flash light energy it splits into yellow and blue + some black, so mainly that means it is a rich blue dye. You want something like a dry erase marker. Those are made with filler particle like iron oxide powder or carbon black, that can't be washed or create stains on anything non-porous. I still think the secret will be as witby Simba - General
<<< building the 10 stepper motor prototype now I dont know about 10 thermistors though.by Simba - Developers
Evil Monkey Wrote: ------------------------------------------------------- > I calculated the Reynolds numbers based on dynamic > viscosity of between 0.5 and 2 Newton seconds per > meter squared and unfortunately am getting very > laminar flow. Called it! And I didn't even have to do the complex math Yeah it sucks, but I realized mixing was out of the question when the stuff barby Simba - General