RAPPY: The 3D printer with position feedback control system
RAPPY: The 3D printer with position feedback control system
RAPPY is a DC motor powered 3D printer equipped with position feedback control system that no other 3D printer in its category has.
RAPPY is a DC motor powered 3D printer equipped with position feedback control system that no other 3D printer in its category has. Read more
An affordable, high-resolution 3D printer with new technology for everyday life.
A revolution in 3D printer has just begun.
Everybody needs a 3D printer.
In the world of Do-it-yourself, who doesn't want a 3D printer? In schools and homes, for hobbies and appliances, benefits and possibilities of 3D printer are infinite. Unfortunately, current 3D printers have many problems. Pricing is one of the inhibiting factors. If there is a 3D printer for a price of, say, an entry-level DSLR, wouldn't you want one? Cost aside, there are other problems too. 3D printers in the market nowadays are designed for experts of machines or physics. Did you know that 3D printers has to be calibrated carefully because they were designed to operate only under specific condition? This limitation comes from the motors in the 3D printers, namely, stepper motors. Stepper motors require a precisely controlled circumstances, and to provide it, 3D printers are built in a big, bulky housing and delicate calibration. Isn't it just too cumbersome for ordinary people or kids to calibrate or tune their machine, every time when they are trying to print out simple household appliances or school assignments?
Motor is what matters and RAPPY adopts DC motors.
Stepper motors are the ones found in most current 3D printers. They are easier to command, but they are big, expensive, and has limited dynamic characters.
Alternative? DC motors. They are not only faster and more powerful, but also cheaper, smaller and lighter. Most robots in automobile assembly line and highly advanced humanoid robots employ DC motors because of their dynamic characters and higher energy efficiency.
RAPPY is a 3D printing robot with sophisticated control system.
Many people call 3D printers ‘bots’ because their basic principle is very similar to that of robots. What is special about robots is a feedback control system with which error or changes in environment is sensed to self-correct their movement. And this is exactly how RAPPY controls DC motors. Together with DC motors and a high resolution position feedback control system, Stellamove RAPPY is truly an advanced robotic system.
We achieved quantum leap in DC motor control.
DC motors are also commonly found inside toys, because it is cheap and powerful in spite of its small size. Of course, toys are not keen on precise control. So, how do we achieve a high accuracy such as in sophisticated robots? It is only possible with sophisticated controller, which also costs pretty expensive.
Well, that's yesterday.
What we have achieved with RAPPY is precise DC motor control with simple system. We developed revolutionary software and embedded it into a very simple hardware which eventually works like a machine worth thousands of dollars. This is literally a quantum leap in DC motor control. No other system today achieves an accuracy of RAPPY under such a simple architecture.
Now, we are opening a new robot age with DC motor.
DC motors are superior in most aspects.
DC motors are faster, light weight, lower in cost than stepper motors and better in dynamic response. RC planes and drones use DC motor because of its high power and light weight. By employing DC motors we can reduce the main costs of 3D printer.
RAPPY brings you strength and stability
With the help of position feedback control system, RAPPY has an ability of disturbance rejection, which means it can resists against not only external shock but also internal mis-tracking caused by build up errors.
3D printers operate not only for a couple of minutes but for several hours to print out a single object. As a result your printer may run dozens of hundreds of hours in total to meet your need. The situation is quite different from that of using 2D printers. This is why 3D printers need a rigid structure for its stability against long run.
RAPPY is designed for continuous operation with a very low failure rate and features such as automatic position correction. RAPPY can persists its work track with the help of position feed back control system and even can resists against shock or shake. RAPPY's stability is unprecedented among 3D printers.
With the help of DC motor and quality feedback control we could adopt a simple architecture and eventually we dramatically reduced our system’s cost.
Are you frustrated that low-end 3D printers don't guarantee quality to show true beauty of your design? With a fraction of cost, you will have 100-micron resolution for the z axis.
3D printing requires well up to several hours, and this is quite different from 2D printing. Speed matters seriously. Stellamove RAPPY achieves high-speed building by using two direct current encoder motors for each of the three axes.
Just forget the bed leveling with Stellamove RAPPY. Auto leveling, or automatic adjustment of vertical position of the extruder is done everytime you run the system. You don’t need to worry about it or spend time to fit for the best printing.
PLOTTING ON A FLAT SURFACE
Two dimensional plotting on a flat and rigid surface is another use of RAPPY. The speed of RAPPY’s plotting is almost identical to that of its three dimensional printing on a single layer. A use for this will be circuit board printing for electric engineers. We are actually using this feature as we develop RAPPY.
The RAPPY PUMP board is the heart of the system and it enables position feedback control which allows RAPPY to move precisely and fast. We’ve designed this special DC motor control board which empowers RAPPY as the best DC motored system in its category. Actually, including its software, this is the core of the RAPPY system and it performs in par with other systems several times more expensive. Dozens of thousands of our original software code lines back our generations of hardware boards in the development process.
Our unprecedented hardware perfectly works with it’s accompanying software, PUMP Builder. The software greatly works with .STL and .gcode to build form.
The Smart Bed Plate
Stop worrying failing when you detach finished print from bed plate. RAPPY's Smart Bed Plate is equipped magnets, hence the upper plate snaps off easily from the bottom base.
The story goes back to twenty years ago.
In 1993, we were students in an engineering school and obsessed in robots. We organized a group of robot builders. We studied hard and enjoyed school life including group activities. After graduation we were all scattered in diverse areas and experienced how big industries run from products and service planning to launch and after service. After decades of practical experience in industries, we realized that we might build our own 3D printer by ourselves with expertise in control. Decades of industrial experience definitely helped a lot in designing, developing and planning for a production. Robots can be defined as a machine to perform pre-programmed activity and adjust its action in accordance with environmental change. By this sense, RAPPY system is a robot. Now we are stepping our first foot in making robots. With our system we continue to push our limits to bring more sophisticated system within our lives.
Manufacturing Plan and Time Line
We already completed our design of production lines and are waiting for your support for us.
However, we do acknowledge that we need more time and efforts for completion of the production lines in order to ensure high quality and reliability of each product that you will receive.
Our members have worked in mobile phone development and manufacturing industry for over ten years. We have deep knowledge and keen understanding in mass production, which is quite different from developing a single prototype. Each mass produced product should have the same quality and reliability as elaborately accomplished prototype. We designed and developed RAPPY for mass production in mind. We are planning to spend considerable time in developing mass production procedure to keep equal high quality.
LOCATION OF THE PARTS PRODUCED AND MANUFACTURING
We will use parts from three different countries, Republic of Korea, China, and Italy.
As you may know, Korea has the world best infrastructure of manufacturing electronic goods.
In the end of production process, every single product will be inspected and verified for plug and play in your hands.
Here is our time line for mass production development.
Why we need your help
With your help we can build technical service earlier and wider to satisfy your needs. By pledge of this project, you are not merely purchasing a single 3d printer, rather joining and helping to open up a new generation of 3d printers. We are excited to show our upcoming products as well.
Risks and challenges
As many Kickstarter projects we have several key risks and challenges which include:
ENGINEERING & DESIGN
We have developed and tested four generations of prototypes and written and optimized astonishing dozens of thousands of lines of code. However we still need to brush up user friendly interface for ease of use. We will push our limits up to deliver our best result until the very last moment we ship the printer.
We are trying to meet your demands from all over the world. However for some areas further paperwork are needed for export and import. Each of you is valuable to us. Our plan covers wide ranges of issues and practical back up. We will do our best to deliver our product smoothly to all of you.
- (31 days)