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A fork of the ground breaking Kossel 3D Printer, with all 3D Printed parts injection molded for ease of assembly and cost reduction.
A fork of the ground breaking Kossel 3D Printer, with all 3D Printed parts injection molded for ease of assembly and cost reduction.
189 backers pledged $122,016 to help bring this project to life.

About this project

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$122,016

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Update:

High Resolution shots of the printer's output here:

History:

About a year ago, I designed the OpenBeam Construction System as a low cost way to rapidly build mechanical prototypes.  One of the application I had in mind was the construction of 3D Printers.  Up until OpenBeam, the traditional method of building 3D Printers was with 3D Printers.  

3D Printers are great, and we have been involved in the 3D Printing community for a very long time.  However, when used in a production setting, it quickly becomes an artificially created bottle neck in work flow and a possible support issue as well due to variances between parts.  So, with the OpenBeam Construction System, we chose to do things differently.  We designed components that form the fundamental building blocks of 3D Printers and other small scale automation machines.  These components are designed to be as modular and reusable as possible.  This way, individual components can benefit from the economies of scale of modern mass production techniques while still allowing designs to iterate and evolve.

OpenBeam Kossel Pro - Prototype-03 - at Metrix Create:Space
OpenBeam Kossel Pro - Prototype-03 - at Metrix Create:Space

Design Philosophy of the OpenBeam Kossel Pro

After Johann developed the ground breaking work behind the Rostock 3D printer, I donated some material to him to work on the next generation deltabot, code named: "Kossel".  The team at Metrix Create:Space have been working on and off on the Kossel and it's bigger variant Kossel Pro for the past six months, and we are now confident enough in its design to be launching this Kickstarter.

Multiple Kossels and Kossel Pros
Multiple Kossels and Kossel Pros
Multiple OpenBeam based 3D Printers at Metrix
Multiple OpenBeam based 3D Printers at Metrix

We will be designing our parts for maximum interchangeability between the Kossel and the Kossel Pro.  We expect that parts such as the extruder body, the end effector, the ball joints, and the carriages to be reusable between the two machines.  We will also be intentionally over designing our parts - for example, we are using a commercial linear ball recirculating rail, and we will be designing a fully ball bearing arm joints.  Such features may not be necessary for a machine the scale of the Kossel / Kossel Pro, but by over designing, it allows for future expansion - larger printers, more aggressive printing speeds, multiple extruders, etc.  These features are beyond the scope of this current kickstarter, but we hope that our contribution will allow others to build off our work.

Specifications:

Build Area:  Cylindrical Build Area of 250mm Diameter x 250mm Height
Linear Actuator resolution: 0.2mm / full step, 1/32 Micro stepping
Extruder:  OpenBeam designed Dual Use extruder body.  Includes parts for both standard NEMA17 stepper mount and geared pancake motor.  Extruder can be configured for both direct drive and bowden drive.
Hot End:  Testing so far had been done with genuine J-Heads from Brian Refsnyder; if stretch goal is reached, we will be testing our own full stainless steel hot end design.
Swing arms:  Carbon Fiber swing arms with OpenBeam designed full ball bearing ball joints.
Linear Bearings:  12mm Recirculating ball linear slides.
Electronics:  Metrix Brainwave
Heated Bed: Optional.

Specifications are only part of the story.  If you will be at the Bay Area Maker Faire, come by to the Metrix Open Hardware Alliance Booth to see the printer in action and say hello to some of its designers!

Giving back:

The Metrix Open Hardware Lab, with its pick and place machine
The Metrix Open Hardware Lab, with its pick and place machine

OpenBeam is committed to being a good member of the Open Source Hardware community.  We donate a percentage of our proceeds towards open source hardware causes; we are a member of the Open Source Hardware Association, we sponsor the development of Slic3r and other slicer programs with monetary and hardware donation, and we are sponsoring our local mini Maker Faire in Seattle.  For this project, we will be working closely with the folks at Metrix to grow the Metrix Open Hardware Lab.  We are going to do something really cool that will change the way people fundamentally think about prototyping electronics.  We can't tell you all the details yet, except that it will be something really, REALLY awesome.  

Acknowledgement and Special Thanks:

The OpenBeam Kossel Pro is 100% Open Hardware.  We wouldn't be able to achieve what we've done without building on the works of those who had come before us.  Specifically, we would like to extend our thanks to:

*  The RepRap project.
*  Johann Rocholl, for his pioneering work showing the world that delta-geometry robots are possible for 3D printer work
*  Matthew Wilson, for his work on the Brainwave board, and challenging conventional wisdom of what's required for 3D Printer control electronics.
*  The development team behind Marlin and Repetier Host*  The guys on the Deltabot Developer List.
*  Matt Westervelt, Marc Goodner, Matthew Wilson, and Richard DeLeon - the Alpha Prototype build crew.  Their feedback had been invaluable in shaping the development of this printer.

Terence and Johann at 3D Printer Night, Metrix Create Space
Terence and Johann at 3D Printer Night, Metrix Create Space

Additionally, I would like to thank the following folks:

*  Martina and Karm Ning Tam (my parents).  My father especially, who has been helping me with the supply chain issues.

*  Rachel Flamm, aka, future Mrs. OpenBeam, for not throwing me out of the house when I haul home a piece of antique electronics or a boxes of aluminum bits and leaving them around the house.

*  The staff at Metrix:Create Space, for running one of the most awesome hackerspaces on the planet, for fostering the Seattle 3D Printer community, and for all the prototyping work that they've done on the Kossel Pros.

And lastly, we like to thank our supporters, for your continued support for Open Source Hardware.  Thanks for reading,

-=- The team at Metrix, Terence, Rachel, and the furry monster puppy  

Project Gantt Chart.  Click for downloadable PDF
Project Gantt Chart. Click for downloadable PDF

Risks and challenges

First of all - a disclaimer. We endeavor to make the Kossel Pro an easy to build 3D Printer, but please understand that 3D printers are not household appliances like a microwave or TV. Both the building and operating of a 3D printer requires careful attention to details and a certain level of mechanical skills. This is true with ANY 3D printer that is currently on the market. The Deltabot design represents cutting edge, state of the art in Open Source 3D Printers - and being on the bleeding edge comes with the normal trade offs that early adopters will face.

We've mitigated against a full blown, "sh!t the bed" sort of failure (ie, the thing not working) on this project by building and testing multiple Kossel Pro 3D printers over the last 6 months to validate the design concept. We did not simply run to Kickstarter when we got our prototype running - we built multiple machines with multiple members at Metrix, tested different configurations, and experimented with different assembly methods. We will be systematically replacing all the laser cut and rapid prototype parts with mass produced parts (either via injection molding or metal stamping) that will be more accurate and repeatable. The result should be a vastly improved design than what the alpha testers have been building, in terms of machine accuracy and stability.

The biggest risk is a schedule slip. We have learned from our mistakes on the OpenBeam Kickstarter (which delivered majority of the rewards early, despite being overfunded by 300+%) and will be applying what we have learned onto this Kickstarter project. Specifically we are doing two things: 1) We are hiring someone whose day job is to create assembly documentation to do the actual assembly documentation, and 2) we are limiting the number of kit configurations and the choices people can make on their machines to streamline our fulfillment.

When a 3D Printer kickstarter project like this launches, people inevitably asks for more and more upgrades - dual extrusion, printing with nylon, etc. While it is great to be so enthusiastic, the harsh reality is that good execution of a design project requires guarding against scope creep and focusing on the priorities and tasks on hand. As a result, we have already laid out all the stretch goals for this project, to prevent scope creep from taking over the schedule. The schedule that we've posted is one that we are confident to meet or exceed. At times these measures may seem heavy handed, but we would rather under promise and over deliver instead of promising the sky and then being a year late.

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  1. Select this reward

    Pledge $75 or more About $75

    Stamped Parts Only!

    Set of 8 stamped Kossel Pro vertex brackets. Select this option if you already have a bunch of OpenBeam and related linear motion components - or if you want to march to a different drum and build your own bigger delta.

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    Pledge $100 or more About $100

    Injection molded parts FTW!

    Set of injection molded parts for the ball joint, carriage, belt clamps, end effector, extruder and cutoff switch mount. Perfect for someone who already owns a Kossel (Summer 2013 release), or the truly adventurous.

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    Pledge $120 or more About $120

    Linear rails only. Backers at this level receives a set of the custom cut (400mm) linear recirculating ball rails that are used on this printer, for their own experimentation. Sorry, US backers only.

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  4. Select this reward

    Pledge $160 or more About $160

    Stamped and Injection Molded parts

    Set of 8 stamped Kossel Pro brackets, plus injection molded parts for all the ball joints, carriage, belt clamps, end effector, extruder and cut off switch mount. Perfect if you already have a bunch of OpenBeam parts and related linear motion components.

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  5. Select this reward

    Pledge $330 or more About $330

    Brackets, rails and plastic!

    Choose this combination if you want to experiment with building your own machine. One set of ball rails, one set of injection molded parts (extruder + ball joints), and one set of stamped metal brackets.

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  6. Select this reward

    Pledge $500 or more About $500

    Beta / Early Bird Mechanical Only Kit

    Mechanically complete Kossel Pro Chassis. You provide: Electronics, stepper motors, hot end and heated bed. Ships ahead of the main reward shipment so that we can fine-tune the assembly instructions. If pledging at this level, you understand that while the parts are final production parts, the assembly instructions are still in beta and may require some additional interaction / feedback with us to get you up and running. Perfect for the Reprap / Open Source 3D Printer developers out there.

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  7. Select this reward

    Pledge $600 or more About $600

    Kossel Pro Hardware only Kit!

    Mechanically complete Kossel Pro Hardware only kit. Comes with everything you need to build the Kossel Pro's mechanical frame work. You provide the following to make the printer go:

    * Electronics
    * Stepper motors
    * Hot End
    * (Optional) Heated Bed)
    * Power Supply

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    Pledge $900 or more About $900

    EarlyBird Full Kit, with Heated Bed. Kossel Pro Full Kit, including electronics, extruder, motors and heated bed, delivered ahead of the main reward shipment to help us fine tune the assembly instructions. If pledging at this level, you understand that while the parts are final production parts, the assembly instructions are still in beta and may require some additional interaction / feedback with us to get you up and running.

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    Reward no longer available 10 backers
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  9. Select this reward

    Pledge $1,000 or more About $1,000

    Kossel Pro Full Kit!

    We worked really hard to keep the pricing low for this configuration! Featuring the BrainWave Classic Rev 2 electronics board, this amazing little board will handle 1/32 microstepping at a fraction of the cost of existing reprap boards. Complete kit without heated bed; heated bed can be added on at a later time with the addition of a second power supply.

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    Pledge $1,100 or more About $1,100

    Kossel Pro Full Kit with Heated Bed. Mechanically complete kit, with electronics, motors, extruder, hot end, heated bed and power supply.

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    Pledge $1,400 or more About $1,400

    Kossel Pro Kit, fully assembled and tested, with heated bed. Batch #2, ships Jan 2014.

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    Pledge $1,400 or more About $1,400

    Kossel Pro Kit, fully assembled and tested, with heated bed. Batch #3, Estimated ship date: Feb 2014

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    Pledge $1,400 or more About $1,400

    Kossel Pro Kit, fully assembled and tested, with heated bed. Batch #4, ships MAR 2014.

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    Pledge $1,500 or more About $1,500

    Kossel Pro Kit, fully assembled and tested, with heated bed.

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  15. Select this reward

    Pledge $1,600 or more About $1,600

    Limited Edition Kossel Pro Full Kit, with Heated Bed. These babies will ship with custom anodized, US made Metrix orange extrusions! We are only doing a limited run of orange extrusions and we will not be offering this after the Kickstarter is over. The extra money collected will go towards improving the Metrix Open Hardware Lab.

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    Pledge $2,000 or more About $2,000

    Kossel Pro Full Kit, limited Metrix Orange Edition, with heated bed. Ships fully assembled. $500 from each of these reward levels will go towards improving the Metrix Open Hardware Lab

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Funding period

- (44 days)