Skeinforge Chamber

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Skeinforge Contents

Some filaments contract too much and warp the extruded object. To prevent this you have to print the object in a temperature regulated chamber and/or on a temperature regulated bed. The chamber tool allows you to control the bed and chamber temperature and the holding pressure.

The chamber gcodes are also described at:

http://reprap.org/wiki/Mendel_User_Manual:_RepRapGCodes

Contents

Operation

The default 'Activate Chamber' checkbox is on. When it is on, the functions described below will work, when it is off, the functions will not be called.

Settings

Bed Temperature

This chart shows how the temperature changes as the Z axis height rises during printing. The heated bed temperature starts off at 75 C until the Z height reach 1 mm, then it descends to 70 C as the Z height approaches 5 mm, then the temperature remains a constant 70 C until the end of the print.
Having the temperature start off high then reduce as layers are printed helps to reduce warping and promote first layer adhesion to the build surface.

The chart was created using these settings:
Bed Temperature: 75 C
Bed Temperature End: 70 C
Bed Temperature Begin Change Height: 1 mm
Bed Temperature End Change Height : 5 mm
Example object that is 10 mm tall

Default: 60 C

Defines the heated print bed temperature in Celsius by adding an M140 command (sets bed temperature but doesn't wait until that temperature is reached before continuing).

The temperature you'll need to use could be +/- 10 C (from the recommended bed temperature for your filament material) or more depending on how and where your temperature sensor is mounted and if it's calibrated correctly. Some trial and error is needed to find the best temperature for your machine. A known calibrated temperature gauge (like an Infrared Non-Contact Temperature Gauge) is very helpful.

Bed Temperature Begin Change Height

Default: -1 mm

Defines the height of the beginning of the temperature ramp. If the Bed Temperature End Change Height is less than 0, the bed temperature will remain at the initial Bed Temperature.

Bed Temperature End Change Height

Default: -1 mm

Defines the height of the end of the temperature ramp. If the Bed Temperature End Change Height is less than 0 or less than the Bed Temperature Begin Change Height, the bed temperature will remain at the initial Bed Temperature.

Bed Temperature End

Default: 20 C

Defines the end bed temperature if there is a temperature ramp.

Chamber Temperature

Default: 30 C

Defines the chamber temperature in Celcius by adding an M141 command.

Holding Force

Default: 0 bars

Defines the holding pressure of a mechanism, like a vacuum table or electromagnet, to hold the bed surface or object, by adding an M142 command. The holding pressure is in bars. For hardware which only has on/off holding, when the holding pressure is 0, turn off holding, when the holding pressure is greater than 0, turn on holding.

Heated Beds

Bothacker

A resistor heated aluminum plate by Bothacker:

http://bothacker.com

with an article at:

http://bothacker.com/2009/12/18/heated-build-platform/

Domingo

A heated copper build plate by Domingo:

http://casainho-emcrepstrap.blogspot.com/

with articles at:

http://casainho-emcrepstrap.blogspot.com/2010/01/first-time-with-pla-testing-it-also-on.html

http://casainho-emcrepstrap.blogspot.com/2010/01/call-for-helpideas-to-develop-heated.html

http://casainho-emcrepstrap.blogspot.com/2010/01/new-heated-build-platform.html

http://casainho-emcrepstrap.blogspot.com/2010/01/no-acrylic-and-instead-kapton-tape-on.html

http://casainho-emcrepstrap.blogspot.com/2010/01/problems-with-heated-build-platform-and.html

http://casainho-emcrepstrap.blogspot.com/2010/01/perfect-build-platform.html

http://casainho-emcrepstrap.blogspot.com/2009/12/almost-no-warp.html

http://casainho-emcrepstrap.blogspot.com/2009/12/heated-base-plate.html

Jmil

A heated build stage by jmil, over at:

http://www.hive76.org

with articles at:

http://www.hive76.org/handling-hot-build-surfaces

http://www.hive76.org/heated-build-stage-success

Kulitorum

Kulitorum has made a heated bed. It is a 5mm Alu sheet with a pattern laid out in kapton tape. The wire is a 0.6mm2 Konstantin wire and it's held in place by small pieces of kapton tape. The description and picture is at:

http://gallery.kulitorum.com/main.php?g2_itemId=283

Metalab

A heated base by the Metalab folks:

http://reprap.soup.io

with information at:

http://reprap.soup.io/?search=heated%20base

Nophead

A resistor heated aluminum bed by Nophead:

http://hydraraptor.blogspot.com

with articles at:

http://hydraraptor.blogspot.com/2010/01/will-it-stick.html

http://hydraraptor.blogspot.com/2010/01/hot-metal-and-serendipity.html

http://hydraraptor.blogspot.com/2010/01/new-year-new-plastic.html

http://hydraraptor.blogspot.com/2010/01/hot-bed.html

PCB Heated Bed

A resistive wire heated bed etched on a PCB.

http://reprap.org/wiki/PCB_Heatbed

Prusajr

A resistive wire heated plexiglass plate by prusajr:

http://prusadjs.cz/

with articles at:

http://prusadjs.cz/2010/01/heated-reprap-print-bed-mk2/

http://prusadjs.cz/2009/11/look-ma-no-warping-heated-reprap-print-bed/

Pumpernickel2

A resistor heated aluminum plate by Pumpernickel2:

http://dev.forums.reprap.org/profile.php?14,844

with a picture at:

file.php?14,file=1228,filename=heatedplate.jpg

Zaggo

A resistor heated aluminum plate by Zaggo at Pleasant Software:

http://pleasantsoftware.com/developer/3d/

with articles at:

http://pleasantsoftware.com/developer/3d/2009/12/05/raftless/

http://pleasantsoftware.com/developer/3d/2009/11/15/living-in-times-of-warp-free-printing/

http://pleasantsoftware.com/developer/3d/2009/11/12/canned-heat/

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