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The goal is to create and mass produce large scale 3D printers in a sort-of self replicating fashion. I am working on completing the 16" prototype which will be capable of printing enormous objects up to 16"x16"x32"(see below).
I want to keep these printers affordable because I feel they need to be in the hands of creators and people who would use them to innovative.
Unfortunately 3d printers of this size cost around $1200 so I want to do better. I want to make and produce these printers for under $800 and make it so that they are both easy to use and affordable. I have been working with 3d Printers for about 2 years now and it has consumed all of my time. I am constantly tweaking or coming up with a new way of doing something with 3D printing.

Zion16 is developed by Ryan Manley

http://www.kickstarter.com/projects/555589256/zion16-affordable-large-scale-3d-printer-lets-drea

Zion16 schematics

Bigger Zion16 3d printer with 32" hight

Yoda printed on Zion16

Print technology: Fused Filament Fabrication
Build Space
- W × D × H: 230 × 310 × 190 mm (9 × 12.2 × 7.5 in)
- Volume: 13,547 cm3 (827 in3, 2X the volume of MakerBot® ReplicatorTM 2)
(Note: MakerBot and Replicator are registered marks or trademarks of MakerBot Industries, LLC.)
- Height extendable to 220 mm (8.7 in) in the middle of X-axis for additional 198 × 310 × 30 mm (1,841 cm3, or 112 in3) space
Layer resolution: 0.05 mm (0.002 in)
Nozzle diameter: 0.35 mm (0.014 in)
Print materials: 1.75 mm PLA and ABS
Speed
- Top print speed: 150 mm/sec (infill or inner perimeter), 100 mm/sec (outer perimeter)
- Top non-print speed: 300 mm/sec
Acceleration
- Top print acceleration: 3000 mm/sec2 (infill), 1500 mm/sec2 (perimeter)
- Top non-print acceleration: 300 mm/sec2
Electronical
Power requirements:  110/220 VAC
Electronics: RAMBo
Hot-end: MakerGear hot-end with 0.35mm nozzle
Heated bed: 24V 200W heated bed up to 120°C
Cooling fans: Three 24V cooling fans for filament drive, print surface, and electronics
Mechanical
Overall dimension: W × D × H: 484 × 482 × 480 mm (19 × 19 × 19 in)
Weight: 11 Kg (24 lb)
Frame: Aluminum extrusions
Motion

• Zero backlash.
• type: Delta printer
• Speed: 320 mm/s in all 3 directions.
• Resolution: 100 steps/mm in all 3 directions.
• Repeatability: better than 0.03 mm (30 micron)
• Build volume: cylindrical, 170mm diameter, 240mm height.
• Footprint: triangle, 300 mm width (240mm OpenBeam + printed corners).
• Frame height: 600 mm.
• Print surface: unheated round glass, doesn't move.
• Mass of end effector with hotend: less than 50 grams.
• Simplicity: fewer than 200 parts.
• Hardware cost: less than $600 USD.
• Fully automatic print surface level calibration (autoleveling).

The MOST Delta printer is RepRap derived from the Rostock printer with the following design goals:

• Simple build process
• Safe to operate
• True to RepRap
• Maximize value
• Maximize rigidity
• Aesthetically pleasing (or at least neutral)
• All PLA printed parts
• Excellent print performance

The design utilizes plywood linking boards cut to a length that yields a desired printer radius when attached to the printed apexes. This simplifies assembly while helping to assure that printer dimensions are fixed, stable and reasonably well known. It also improves flexibility as the print area in the x-y plane can be changed simply by replacing the boards with boards of a different length. The delta design is inherently simpler to assemble as compared to virtually all it's Cartesian counterparts; this design can easily be built within a day by one person having properly prepared parts.
The design uses a 12v 5A power brick instead of the popular 12v power supplies having mains connections relatively exposed, a relative safety issue, particularly when children are present. The power supply is roughly equivalent to those found with many inkjet printers.
As many printed parts are used in the design as are practical, including printed pulleys. This in large part drove the decision to use open T5 timing belts for the drive, which also makes the design more flexible as the length of the guide rods doesn't need to be based upon the length of an off-the-shelf continuous belt.
Cost considerations drove decisions regarding everything from printer capabilities (as shown, prints PLA only) to guide rod material and length (two six foot lengths of 8mm drill steel are required, producing no waste). A Melzi controller is used as it provides all the necessary features as well as SD card support and reasonable expansion options. The power supply is a fraction of the cost of that required for powering a heated bed.
Printed apexes are very robust, probably overkill, and along with the plywood components and ample fasteners produce a very rigid structure. The printer has proven to transport very well (and can even be seat belted) with no adjustment needed prior to printing at its destination.
The end effector is actively cooled allowing for a unitized effector/hot end mount printed in PLA. The hot end is recessed within the end effector, maximizing z-axis travel and also providing for some print cooling.
Printing performance has been very good as has been the experience of printing with this design. Much less user intervention has been required as compared to experience with Cartesian RepRaps.

Printer capabilities/statistics

• Print media: PLA only (heated bed can be added, expanding media options)
• Filament diameter: 1.75mm
• Nozzle diameter: 0.5mm (can be changed)
• Print volume: ~250mm radius (with 240mm long linking boards) 270mm high
• Melzi print controller w/ integrated SD card reader
• Airtripper's Bowden Extruder

Appropedia is the site for collaborative solutions in sustainability, poverty reduction and international development through the use of sound principles and appropriate technology and the sharing of wisdom and project information.

DeltaTrix has sturdy CNC cut full wood frame construction

DeltaTrix print results

The theoretical printing area is 280mm (11 inch) in diameter. As a square this works out as (almost) 200x200mm (8"x8"), which suits the used 'MK2A' heated bed. As it is also useful to be able to remove items, the gap between the uprights is just over 295mm. The maximum build height is around 280mm (11").
Main features:

• Linear delta robot layout provides a mechanically simple motion platform for moving the print head only, not the workpiece.

• Off the shelf RAMPS electronics allow for easy replacement in case things go wrong.

• Using a LCD display and SD memory card (supplied in our kits), the DeltaTrix 3D Printer can operate on it's own. It does not need to be attached to a computer.

• There are several (Open Source) options in terms of software. At the moment we are using Repetier on the PC, a modified version of Marlin as the firmware on the RAMPS electronics, and the standard Arduino IDE for tweaking the firmware.

• A heated bed with glass print surface, allows for PLA and ABS to be used as filament.

• In terms of filament, the DeltaTrix 3D Printer is designed to accept 1.75mm PLA and ABS on a variety of 1kg reels, as long as it is of good quality.

• Igus linear slides with pretension are used, providing a robust and durable bearing solution from a highly reputable manufacturer. The strengthening ribs on the uprights keep the rails straight and sturdy.

• The current design print head assembly uses a single Reprappro Hot End, with a nozzle size of 0.3 or 0.5mm. The assembly also has a fan and integrated duct for cooling the top of a print.

• Quick changeover print head assembly. Useful for swapping between two print head assemblies, eg. one for ABS and one for PLA. The prototypes use connection blocks, but the kit will have proper connectors. Please, note: the standard kit only contains parts for one off print head assembly.

• Build volume of 200 x 200 x 200mm
• Layer size of 0.05mm
• Minimum wall thickness of 0.19mm
• Standalone machine using USB or SD card gcode input
• Two nozzles sizes, 0.30 and 0.15mm
• Display panel to monitor print operations
• Enclosed heated build chamber to minimize ABS warping effects (they probably don't care about patents that big western corporations have on heated chamber technology)
• Automatic calibration of the print bed
• Russian-specific software interface
• Price: RUB 99,000, or USD 3,000.

Brahma3 Anvil

• Build Volume: 240 x 240 x 240 mm
• No. of Extruders: 1
• Nozzle Diameter: 0.4 mm
• Maximum Extruder Temperature: 350°c
• Hot End: All metal hot end
• Heated Bed with a glass print surface
• Build Platform: Metal / Glass
• Aluminum frame
• Weight: < 15kg
• Dimensions (L, D, H): 380 X 400 X 500 mm
• Slicing Support: Cloud Based
• WiFi supported
• Control unit is Android powered touchscreen tablet
• Power Consumption Rating: 12V, 260W
• Price: Rs. 100,000 (USD 1,610)

Mi3D Pro X9

• Mi3D ProX9 for Industry Applications/Expert Designers
• INDIA's First Double Extruder Printer
• First printer to support print resume on powercut

First print results in PLA and ABS at the same time on same object

Testing the new firmware by printing an octopus. This print took about 1.5 hours with a feedrate of 20 °/s. In this case, thats roughly 55 mm/s. This printer should be capable of at least 40 °/s.

Geoweaver is a student designed robot created in the Creative Architecture Machines advanced options studio at the California College of the Arts (CCA) in San Francisco, California, taught by Jason Kelly Johnson of Future Cities Lab and Michael Shiloh. The design is based on a 12-servo hexapod with a glue gun extruder attached, and is the culmination of about 60 days of research and prototyping. Although the robot's official name is Geoweaver, it also goes by many aliases: Servo Killer, Eater of Shields, Melter of Wires, and Destroyer of Regulators, among many others. It is a very difficult and delicate machine, and is not a project to be tackled for the faint of heart.
But if you do take it upon yourself to accept it's challenges, it's rewards are great: it is a six-legged, walking 3D printer. The center mechanism uses two servos to control the pendulum-like extruder head, allowing it to cover a basic XY plane (though curved to the surface of a sphere, see video above), and one servo for the extrusion gear that forces the glue-sticks through the "print head." All of this can be controlled through the software Rhino 5, with the plug-ins Grasshopper and Firefly

Meet the next generation of Maker’s Tool Works 3D printers. The Fusematic 3D printer is smaller, faster, and more affordable than the MendelMax 2, but made with the same commitment to quality that you have come to expect from MTW.
The Fusematic 3D printer was designed from the ground up for simplicity and reliability. A low part count, linear rails on all axes, and high-reliability electronics are just a few of the elements that set the Fusematic apart. And the electronics are all fully enclosed inside the base, making the Fusematic an excellent choice for schools and office environments.

Faster, Easier Assembly
The machined case with integrated assembly guides makes alignment easy.
Linear rails on all axes.
Preassembled print controller with a pre-configured downloadable firmware for nearly plug-and-play electronics
Keyed connectors prevent the most common electronic problems like shorts and assembly errors, and integrated fuses prevent serious damage in the event something still goes wrong.

Improved Design
The Fusematic 3D printer’s electronics are fully enclosed, which greatly reduces the possibility of injury or electrical malfunction.
The Bowden-style extruder makes the Fusematic 3D printer’s carriage lighter, giving better print quality at higher speeds.
Tuning and calibration is easy and requires no special skills.
The included RAMBo control electronics have nearly foolproof assembly and legendary reliability.

Transportable
A user-added printable handle can be attached to the top plate to make it as easy as possible to transport.
The electronics are fully enclosed within the base, so there are fewer loose wires to snag during transport.
Rugged steel and aluminum construction.

Technical Specifications

• Stylish black and silver components.
• Build area: 200 x 225 x 200 mm, 8 x 9 x 8 inches
• Full size of machine: 300 x 410 x 400 mm
• Layer height: User-selectable, 100 – 300 microns
• Print volume: 9000 cc, 576 cubic inches
• PLA only with base version. PLA, ABS, and experimental materials like nylon and polycarbonate with the optional heated bed
• Shipping weight: Approximately 22 lbs
• Made in the USA with US and imported parts.