About RepRap Darwin
From RepRap.org: RepRap 1.0 "Darwin" is a rapid prototyping machine that is capable of making the majority of its own component parts. Instructions and all necessary data are available completely free under the GNU General Public Licence from http://reprap.org/wiki/RepRapOneDarwin to everyone.
As RepRap 1.0 "Darwin" can copy itself, once you have one you can make others for your friends; or if they have one you can ask them to make one for you. Of course, you can also make as many as you want for yourself; the more you have, the faster you will be able to make other items. RepRap etiquette asks that you use your machine to make the parts for at least two more Darwins for other people at cost, as well as using it to make whatever you or anyone else on the internet can think up...
Darwin consists of a frame made from rods and printed parts. A flat build platform moves vertically in that frame, driven on screw threads by a stepper motor. At the top of the frame there are two write heads that move horizontally (driven by toothed belts and two more steppers) extruding a thin stream of molten plastic to form new layers on the build base. The machine prints layer by layer to form a solid object. The build base then moves one increment down, the second layer is extruded, and so on. There are two heads to allow a filler material to be laid down as well as the plastic. This filler is used to support overhanging parts of the objects being built, and is removed when the process is finished.
The RepRap 1.0 "Darwin" machine has the following characteristics:
- Working volume: adjustable, but nominally 230mm (X) x 230mm (Y) x 100mm (Z)
- Working materials: Polycaprolactone and a filler/support
- Configuration: 3-axis Cartesian drive using stepper motors
- Line and space: 0.5mm and about 0.2mm
- Feature size: about 2mm
- Positioning accuracy: 0.1 mm
- Layer thickness: adjustable, but nominally 0.3mm
- Computer interface: USB
- Material handling: Two fixed material deposition extruders, user exchangeable
- Power supply needed: 6A max, 3A continuous at 12V DC
- Driving computer and operating system needed: Microsoft Windows, Linux, Unix, or Mac
- Exterior dimensions: adjustable, but nominally 600 mm wide x 520 mm deep x 650 mm high
- Weight: about 14 Kg
Electronic's Kit for most RepRap's: RepRap Starter Kit
The Darwin is not available for retail sale, rather you access the build instructions and source the components yourself from multiple sources. Many of the parts are 3D printed and it is helpful to have access to a 3D printer or know someone that can print these parts for you, in the spirit of self replicating rapid prototyping.
* MSRP for a RepRap is a rough estimate of material costs, your actual expense will vary dependent on the sources of components that you choose. Your expense in time spent sourcing and assembling is not factored.
** Specifications are dependent on the components used and the assembly process itself. While there is a loose standard for building a particular model of RepRap, the end user is free to improvise and modify their printer.
** Filament size is listed as 1.75 as a default (due to popularity) but can be built to print with 3.00mm size filament.