Cool is a craft tool to cool the shape.
Cool works well with a stepper extruder, it does not work well with a DC motor extruder.
If enabled and Orbit is selected, before each layer that takes less then Minimum Layer Time to print the tool head will orbit around the printed area for Minimum Layer Time minus 'the time it takes to print the layer' before it starts printing the layer. This is great way to let layers with smaller area cool before you start printing on top of them (so you do not overheat the area).
If enabled and Slow Down is selected, layers that take less then Minimum Layer Time to print will print slower so they take at least Minimum Layer Time to complete. This can give smaller areas of the print time to cool before the next layer (a fan is very helpful here).
Allan Ecker aka The Masked Retriever's has written the "Skeinforge Quicktip: Cool" at: http://blog.thingiverse.com/2009/07/28/skeinforge-quicktip-cool/
The default 'Activate Cool' checkbox is on. When it is on, the functions described below will work, when it is off, the functions will not be called.
Default: 1 C
If the layer is a bridge layer, then cool will lower the temperature by Bridge Cool degrees Celsius.
Default: 'Slow Down'
When selected, cool will add orbits with the extruder off to give the layer time to cool, so that the next layer is not extruded on a molten base. The orbits will be around the largest island on that layer. Orbit should only be chosen if you can not upgrade to a stepper extruder.
When selected, cool will slow down the extruder so that it will take the minimum layer time to extrude the layer. DC motors do not operate properly at slow flow rates, so if you have a DC motor extruder, you should upgrade to a stepper extruder, but if you can't do that, you can try using the 'Orbit' option.
Default: 2 C
If it takes less time to extrude the layer than the minimum layer time, then cool will lower the temperature by the Maximum Cool setting times the layer time over the minimum layer time.
Minimum Layer Time
Default: 60 seconds
Defines the minimum amount of time the extruder will spend on a layer, this is an important setting.
Minimum Orbital Radius
Default: 10 mm
When the orbit cool type is selected, if the area of the largest island is as large as the square of the Minimum Orbital Radius then the orbits will be just within the island. If the island is smaller, then the orbits will be in a square of the Minimum Orbital Radius around the center of the island. This is so that the hot extruder does not stay too close to small islands.
Name of Alteration Files
Cool looks for alteration files in the alterations folder in the .skeinforge folder in the home directory. Cool does not care if the text file names are capitalized, but some file systems do not handle file name cases properly, so to be on the safe side you should give them lower case names. If it doesn't find the file it then looks in the alterations folder in the skeinforge_plugins folder. The cool start and end text idea is from: http://makerhahn.blogspot.com/2008/10/yay-minimug.html
Name of Cool End File
If there is a file with the name of the "Name of Cool End File" setting, it will be added to the end of the orbits.
Name of Cool Start File
If there is a file with the name of the "Name of Cool Start File" setting, it will be added to the start of the orbits.
Default: 2 mm
Turn Fan On at Beginning
When selected, cool will turn the fan on at the beginning of the fabrication by adding the M106 command.
Turn Fan Off at Ending
When selected, cool will turn the fan off at the ending of the fabrication by adding the M107 command.