If anyone wants to build one, here are the designs: In the video he says "Three to four hundred dollars". The BOM shows a total material price of $458.18 and that's only the mechanicals (no electronics).by JohnWasser - General New Machines Topics
The X-belt (1300mm) and Y-belt (810mm) together come to a hair less than 7 feet. One 8-foot length should be more than enough.by JohnWasser - General
It works! Go to "Current Order". If you get separate boxes for Quantity and Item click on the "Paste items and quantities" link to get a "Paste in items and quantities to add them to your order" text box. Paste in the list and click the ADD button. Merchandise total $247.54 The order system points gives some warnings: "Lines 1, 2, and 3 are duplicates" I wonder if there is a way to get allby JohnWasser - General
So far I have not seen anything even close to a full Mendel kit. If you want to build a complete 3D printer from a kit I would recommend the Makerbot Cupcake or the BitsFromBytes RapMan. Many people have had success with those kits.by JohnWasser - For Sale
The bar lengths, except for jigs, do not appear to be critical. I don't think any measurements are taken from the ends and most of the threaded rods can be extended indefinitely without running into anything. The 'B' studs might run into problems if more than a cm or two long because they will start to interfere. When doing the genetic algorithm optimization I assumed a 2 mm kerf, just to beby JohnWasser - General Mendel Topics
In the UK, Bits From Bytes sells the "RapMan" (laser-cut acrylic version of RepRap Darwin) in kit form: £750.00 In the USA, Makerbot.org sells CupCake (laser-cut plywood RepStrap) in kit form: $750.00 Basic Kit $950.00 Deluxe Kit I don't think anyone currently sells a complete RepRap (Darwin or Mendel in kit form, let alone completed units.by JohnWasser - Wanted
I had hoped to find a way to fit all 18 pieces and 3 jigs on 8 pieces of 36" stock. I wrote a genetic algorithm optimizer but got no solutions in less than nine piece of stock. At least it's a lot better than the Darwin which needed 16 pieces of 36" stock and left lot of scrap. The 9-bar solution is pretty straightforward: 1: A,A (34mm remaining) 2: B,B,J3 (17mm remaining) 3: B,B (17by JohnWasser - General Mendel Topics
Triffid_Hunter Wrote: ------------------------------------------------------- > I see two of each. > > ly_3 shows them most clearly, D1 between the Z > Idler and Z motor bracket, and D2 between the two > Z Leadscrew bases (or is it the other way > around?) > > > ps: > It looks like the rendering in the spreadsheet is not the same as the rendering in the assemblby JohnWasser - General
I think the spreadsheet is wrong in calling for two copies of D1 and two copies of D2. The mechanical drawing only shows one of each. As I mentioned in an earlier post you can also get all the threaded pieces, including the three jigs, from eight lengths of 36-inch (914.4 mm) stock. That is useful in the USA where metric stock is less common and more expensive. 1: A+A 2: B+B+J3 3: B+B 4: B+Bby JohnWasser - General
Yudo screen printer $299.99 Look like it's jut a packaging of the normal photo-sensitive emulsion screen-printing process. You don't really need the expensive light box.by JohnWasser - Controllers
A good place to discuss powder/binder based 3D printing is:by JohnWasser - Powder Printing and Selective Laser Sintering
I tried David Laserscanner this week. I used the free version and tried to paste the meshes together with MeshLab. MeshLab wants four points of intersection for adjacent scans and I found that four scans was not nearly enough to produce the necessary overlap. The objects I was using were also not highly patterned so finding matching points was difficult. Perhaps with practice I'll get a usabby JohnWasser - 3D Scanners, Book Scanners, and Optics
Look like the motion is mirrored on both X and Y. If it was just the Y axis the figure would be flipped vertically.by JohnWasser - RepRap Host
swinson Wrote: ------------------------------------------------------- > My only problem with this method is that it only > scans one face. I am trying to find software that > can combine all of the faces to get one 3D object. I believe the program MeshLab can align and merge multiple meshes into a single mesh. See:by JohnWasser - 3D Scanners, Book Scanners, and Optics
The USB to TTL serial cable is like a USB to RS232 serial cable except it uses the 0 and 5 volt logic levels of Transistor Transistor Logic (TTL) chips rather than the -12 and +12 volt logic levels of RS232. You need the cable to communicate with the bootloader in an Arduino or similar microcomputer. That's how you load a program into the Arduino. You need a DIFFERENT device to program the Ardby JohnWasser - Controllers
The stepper motors sold by MakerBot are: NEMA 17 Part Number: Kysan Electronics / 1123029 200 steps per revolution (1.8 deg/step) 0.4A / phase Phase Resistance: 35ohm Phase inductance: 44mH Holding torque: 260nM Shaft diameter: 4.78mm / 0.188" (3/16") Shaft length: 24mm Motor depth: 34mm NEMA 23 Keling KL23H51-24-08B Specifications here: My guess is that you want a stepper whose current limiby JohnWasser - Reprappers
I look forward to seeing pricing information when you get into production.by JohnWasser - Wanted
Sounds like the deprecated SIGNAL() macro and "SIG_OUTPUT_COMPARE1A" vector name were not producing a valid service routine. Then when the timer was enabled the un-handled interrupt caused a reset. Changing to the current ISR() macro and current vector name has apparently fixed the problem.by JohnWasser - RepRap Host
says: This is SVG, a language for describing two-dimensional graphics in XML. The Scalable Vector Graphics (SVG) Copyright 2001, 2002 World Wide Web Consortium (Massachusetts Institute of Technology, Institut National de Recherche en Informatique et en Automatique, Keio University). All Rights Reserved. The DTD describes what tags (just like in HTML) cby JohnWasser - RepRap Host
Lompocus Wrote: ------------------------------------------------------- > The only thing I'm stumped on is a way to heat the > plastic filament. > I'm not sure I > understand why resistors and such are used for > that. Resistors turn electrical power into heat. You can estimate the number of Watts of heat by measuring the voltage across the resistor, squaring that, and dividingby JohnWasser - Reprappers
Unusual new form of comment spam. One account asks a question so vague that it might or might not be on topic, then a second account answers with a long rambling story and a link.by JohnWasser - Administration, Announcements, Policy
I found a mention of it. Apparently it was a rumor SIX YEARS AGO: "The future has bewildering potential. In 10 years, you might be able to fax a toy car to a favorite niece or nephew. It could even be sooner than that. The New York Times reported rumblings that Hewlett-Packard is planning to sell a 3-D printer for $1,000." They point to the original article: "A group of Hewlett-Packard engby JohnWasser - General
I, too, miss being able to get to the RepRap site by clicking on the logo. John Wasserby JohnWasser - Administration, Announcements, Policy
I don't think that trying to share major components (except maybe the power supply) between two RepRaps is practical. On a single RepRap Motherboard there are only enough stepper drivers to run one Bot. Using the non-motherboard electronics (separate driver boards for each stepper) you could use a larger Arduino and add enough stepper drivers, etc, to drive a second Bot but you would need a majby JohnWasser - General
German SSDeV member Ray is known all around the world for his impressive collection of handcuffs and his fun ways of opening most of them. On top of that he gives great presentations and always manages to add a lot of humor into them! At HAR he pulled another stunt: He used a 3D printer to print handcuff keys. And not just any ordinary handcuff key … no, it’s the official handcuff key from thby JohnWasser - Let's design something! (I've got an idea ...)
The parts list for the Stepper Driver 2.3: The part you want seems to be the '.156" header' as described here:by JohnWasser - Controllers
A 3D printer that sells for less than most inkjet printers would be a MAJOR breakthrough in ending poverty. $50 is about how much the raw ABS to print out a Darwin costs! Where can I read more about this project? I have a small CNC mill, lathe, wire welder and other tools that might help.by JohnWasser - General
sam0737 Wrote: ------------------------------------------------------- > In particular, is there any simple object that I > can print to verify my machine settings? As I understand it, it's traditional to print a small shot glass (minimug) to toast your success. Minimugby JohnWasser - Reprappers
RepRap is still relatively new. I think that significantly increasing cost and complexity to gain some speed would be premature at this point. If you have build a single-nozzle machine and find that it is not building parts as quickly as you want you should probably just build a second RepRap. That way you can make two objects in parallel and don't need any software changes, either.by JohnWasser - General
The Darwin design seems to be based on a cube of 500 mm rods. This works fine when your local hardware store has rods/studding in 1 meter lengths. Unfortunately for those of us in the USA, rods here tend to come in yards (914.4 mm). You just can't get two 500 mm rods out of a yard so there was significant material waste. The Mendel only has two pieces (the X bars) 1/2 yard long or longer. Takiby JohnWasser - Mechanics