Skeinforge Bottom

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Skeinforge Contents

Bottom sets the bottom of the carving to the defined altitude.

Contents

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Operation

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

Note: With Bottom disabled, Skeinforge will automatically add 1/2 of the layer height to the starting Z height. This behavior may be undesirable if you have already set your Z endstop to the desired starting height. To disable this behavior, enable Bottom and set both Additional Height over Layer Thickness and Altitude to 0.

Settings

Additional Height over Layer Thickness

Default: 0.5

The layers will start at the altitude plus the Additional Height over Layer Thickness times the layer thickness. The default value of half means that the bottom layer is at the height of the bottom slice, because each slice is made through the middle of each layer. Raft expects the layers to start at an additional half layer thickness. You should only change Additional Height over Layer Thickness if you are manipulating the Skeinforge output with your own program which does not use the raft tool.

Altitude

Default: 0 mm

Defines the altitude of the bottom of the model. The bottom slice has a z of the altitude plus the Additional Height over Layer Thickness times the layer thickness.

SVG Viewer

Default: 'webbrowser'

If the 'SVG Viewer' is set to the default 'webbrowser', the scalable vector graphics file will be sent to the default browser to be opened. If the 'SVG Viewer' is set to a program name, the scalable vector graphics file will be sent to that program to be opened.

Usage

Side view of filament and print bed.

Bottom2-No-Z-Ratio.png

In this scenario, the Z axis will need to be raised before printing. Here's where Bottom is a really useful plugin to control the starting Z height for printing. By setting Additional Height over Layer Thickness ratio to 1 (or just slightly under, so the first layer adheres better), Skeinforge will automatically set the starting Z height to your layer height. Using this method, you no longer need to adjust your physical endstops when you change layer height.

Protip: Using this method, parking the tip of the hotend on the print bed, can eliminate most oozing while your printer is hot and idle.


Bottom2-No-Z-Altitude-Ratio.png

Here the printing Z axis homes to the top of the print bed. The starting Z print height is set by a combination of Additional Height over Layer Thickness ratio * Layer Height + a fixed Altitude amount. You may want to use this if your print bed isn't completely flat. If your print bed is slightly concave, you could set Altitude to a small negative amount to correct for it, or a small positive amount if convex.


Bottom2-Z-Altitude-Ratio.png

Here the printing Z axis homes to a set point above the print bed. The actual starting print height is set by a combination of Z height endstop + Additional Height over Layer Thickness ratio * Layer Height + a fixed Altitude amount.


Bottom2-Z-Altitude.png

Here the printing Z axis homes to a set point above the print bed. The actual starting print height is set by a combination of Z height endstop + a fixed Altitude amount (which is negative in this case). Here Altitude is used to correct for the Z endpoint being set too high.

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