CEB Press Sandbox

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CEB Press Sandbox
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Last upddated Dec. 23, 2012.


The Liberator is OSE's automatic, high throughput (up to 16 bricks per minute) Compressed Earth Brick Press. It is named The Liberator because it is intended to free people from the single highest cost of living - housing. See Cost of Living and GVCS Naming Convention.


Prototype IV built in a Collaborative Production Run. Build and use the CEB Press to make Compressed Earth Blocks to make all sorts of structures!

Cebpress4.jpg Liberator bricks.JPG

Hl1.jpg Hl2.jpg


Grate (including deflectors, hinges, and supports)

CEB Hopper (including saddle)

CEB Shaker (including shields)

CEB Legs (including holders and feet)

CEB Outer Frame (including drawer rollers and shields)

CEB Inner Frame

CEB Soil Drawer


Quick connect fittings and modular solenoid valves are used for easy modification.


Electronics - CEB Press IV

12V Battery or Power Supply suffices. Peak current is <5A.

Sensor Holders

Hall Effect Sensor Module (x2, with 20mm dia mounting hole)

Terminal Case x1 with 300mm x 150mm area x 50mm height working volume

Terminal Block x2 with 120mm length x 25mm width

Solenoid Driver x1

Arduino Uno R3 Board from NKC Electronics via Amazon

Alligcables.jpg Mountedcebelec.jpg Mountedcebelec2.jpg Mountedcebelec3.jpg

Mountedcebelec4.jpg Mountedcebelec6.jpg Circuitdiagram.svg


Arduinocebcode.jpg Mountedcebelec5.jpg

Testing and Operation Code - Last Updated November 25, 2012

Arduino Software Download

Arduino Uno R3 Board from NKC Electronics via Amazon

How to upload code to the Arduino microcontroller

Code Functions

  • Sensor signal strength monitor
  • Sensor latching monitor
  • Cylinder full motion-sensed cycling
  • Continuous brick pressing

Code Features

  • Boolean menu and important variable values at beginning of code!
  • Motion-time-calculated compression and release durations
  • Serial write feedback during testing and operation!
  • Multi-sample-averaged sensor signal processing!
  • Proper motion ordering for minimum-trouble operation!


  • Avoid excessive hydraulic pressure! Make sure you have a correctly installed pressure relief valve on your hydraulic circuit. Start testing the CEB Press with a low pressure setting on the pressure relief valve.
  • Avoid hydraulic fluid leaks and non-motion! Check that all hydraulic connections are tightened/connected and theoretically leak-free.
  • Avoid premature sensor latching! Check that the sensors are mounted parallel to the magnets. Sensor should be not too close but not too far from magnets
  • Make sure that the middle primary magnet is passed by the end of the primary cylinder's compression motion

Collaborative Production Run - September 24-26, 2012

See also CEB 4 Design Planning (June 2012) and CEB Press Collaborative Production Results.


More images on Facebook.

Collaborative Production Run - November 23, 2012

November 23, 2012 Collaborative Production Run

CEB Press Sandbox
   Home  |  Research & Development  |  Bill of Materials  |  Manufacturing Instructions  |  User's Manual  |  User Reviews    78px


Bricks pressed on The Liberator

The "Liberator" Compressed Earth Block Press is a machine that makes compressed earth blocks (CEBs).

The CEB Press takes earth/dirt/soil and compresses it tightly to make solid blocks useful for building. Compressed earth blocks have many advantages as a building material: by making the building materials from the readily available dirt on the building site, they eliminate the need to transport bricks from elsewhere, reducing financial cost and environmental impact. Compressed earth blocks are very strong and insulate well against both heat and sound, making for very energy-efficient building (especially combined with the energy savings from not needing to transport them from offsite). Best of all, the material they use is already on-site and does not need to be purchased -- quite literally, dirt-cheap! See the wiki page on Compressed Earth Blocks and the CEB category for more details on building using CEBs.

The Liberator has been fully designed and tested by the Open Source Ecology team. Because the Liberator is an open source technology, you can freely download instructions to build your own from materials you can obtain yourself, or contact opensourceecology[at]gmail[dot]com to buy a kit or a finished machine.

Building a machine yourself might seem intimidating, but every step of the process is fully documented and the OSE community is available on our discussion forums if you need help, advice, or a little hand-holding.

Using the CEB Press, two people can build a 6 foot high (1.83m) round wall, 20 feet (6.1m) in diameter, 1 foot (30cm) thick, in one 8 hour day, though construction time will vary somewhat depending on preparation time, what equipment is available (tractor to prepare the ground and move the blocks where they need to go), the quality of the soil, and other factors. The bigger the block size, the faster a wall can be erected, but at the cost of heavier blocks that are more of a strain to work with. Blocks from The Liberator average 25 pounds (11.3kg).

See CEB Design for more information.

CEB Press (aka "The Liberator")



Template:Video:CEB Press Sandbox

Product Ecology

Construction Product Ecology
Product Ecology
CEB Press CEB Press
From Uses Creates Enables


  • Hopper
  • Grate
  • Hopper shaker
  • Frame
  • Compression chamber
  • Hydraulic Cylinders
  • Solenoid controller
  • Soil Drawer
  • Controller Box


James Slades' first independent replication of the CEB Press in process as of Sep. 2, 2011. Welding the soil loading drawer.
  • Currently the CEB is at product release status and is being actively manufactured at Factor e Farm and in Texas. The presses will be used heavily as a part of the Factor e Farm Infrastructure Buildout 2011.
  • The CEB documentation is being actively upgraded to meet Fabrication_Procedure_Standards with the goal of serving as a reference implementation for GVCS documentation.
  • Eventually the torch table will be used to automate the fabrication of the CEB machine, reducing fabrication time by an estimated 20 hours and, thus, the cost to build the machine.
  • The first independent replication is in process as of Sep. 2, 2011, by James Slade and Jason Smith in Texas.
  • CEB 4 design planning
  • CEB Press V

See Also

The Global Village Construction Set
Habitat CEB Press Cement Mixer Sawmill Bulldozer Backhoe
Agriculture Tractor Seeder Hay Rake Well-Drilling Rig
Microtractor Soil Pulverizer Spader Hay Cutter Trencher
Bakery Oven Dairy Milker Microcombine Baler
Industry Multimachine Ironworker Laser Cutter Welder Plasma Cutter
CNC Torch Table Metal Roller Rod and Wire Mill Press Forge Universal Rotor
3D Printer 3D Scanner CNC Circuit Mill Industrial Robot Chipper Hammermill
Drill Press Induction Furnace
Energy Power Cube Gasifier Burner Solar Concentrator Electric Motor Generator Hydraulic Motor
Steam Engine Heat Exchanger Wind Turbine Pelletizer Universal Power Supply
Nickel-Iron Battery
Materials Aluminum Extractor Bioplastic Extruder
Transportation Car Truck

Imprimante 3D Scanner 3D Extracteur d'Aluminum Pelleteuse Four à Pain Presse à balles de paille Extrudeuse à bioplastiques Bulldozer Voiture Presse BTC Betonnière Broyeur à marteaux Imprimante de circuits électroniques Table de découpe numérique Trayeuse Perçeuse à colonne Moteur électrique Gazogène Faucheuse Râteau à foin Moteur hydraulique Fourneau à induction Bras robotisé Poinçonneuse Découpeur Laser Laminoir à plaques Microcombine Microtracteur Multimachine Batterie Ni-Fe Machine à granulés Torche plasma Power Cube Presse hydraulique Laminoir à barres et fils de fer Pulvérisateur de terre Scierie Semoir Concentrateur solaire Roto-bêche Moteur à vapeur Echangeur de chaleur Tracteur Fraiseuse de tranchée Camion Alimentation électrique universelle Rotor universel Poste de soudure à l'arc Plateforme de forage de puits Eolienne

Key Design Planning Prototype Almost done Full Release