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· Any improvements on the default Raft settings?
I don't use raft very much. If I notice a model that may lift (long thin features on the build plate) I typically use "mouse ears" to help adhesion (usually with PETG). That being said, a raft is just a bunch of heavy extrusions with a model starting on top. The distance between the top of the raft and the initial layer of the model has a large effect on both Surface Quality of the model bottom, and the release of the raft from the model without tearing up the model. "Raft Air Gap" and "Initial Layer Z Overlap" have the biggest effect on those.
I sliced a model and used a raft with the default raft settings. Layer Height = 0.2, Raft Air Gap = 0.3, Initial Layer Z Overlap = 0.15. The first layer of a raft is a negative number and in this example is "Layer:-6". The bottom of the model is always Layer:0 in the Gcode. You'll notice this does not match up with layer numbering in the Cura preview which always starts at "1".
Z0.24 (.24) ;Layer:-6
Z0.54 (.30) ;Layer:-5
Z0.74 (.30) ;Layer:-4
Z0.94 (.20) ;Layer:-3 Top layer of the raft
Z1.44 (.50) ;Layer:0 - The first layer of the model @ [Air Gap + Layer Height] above the raft
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GregValiant 1,351
I don't use raft very much. If I notice a model that may lift (long thin features on the build plate) I typically use "mouse ears" to help adhesion (usually with PETG). That being said, a raft is just a bunch of heavy extrusions with a model starting on top. The distance between the top of the raft and the initial layer of the model has a large effect on both Surface Quality of the model bottom, and the release of the raft from the model without tearing up the model. "Raft Air Gap" and "Initial Layer Z Overlap" have the biggest effect on those.
I sliced a model and used a raft with the default raft settings. Layer Height = 0.2, Raft Air Gap = 0.3, Initial Layer Z Overlap = 0.15. The first layer of a raft is a negative number and in this example is "Layer:-6". The bottom of the model is always Layer:0 in the Gcode. You'll notice this does not match up with layer numbering in the Cura preview which always starts at "1".
Z0.24 (.24) ;Layer:-6
Z0.54 (.30) ;Layer:-5
Z0.74 (.30) ;Layer:-4
Z0.94 (.20) ;Layer:-3 Top layer of the raft
Z1.44 (.50) ;Layer:0 - The first layer of the model @ [Air Gap + Layer Height] above the raft
Z1.49 (0.05) ;Layer:1 @ [Layer Height - Initial Layer Z Overlap] above Layer:0.
Z1.69 (0.20) ;Layer:2 starts using the actual Layer Height
Edited by GregValiantLink to post
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