GregValiant 1,342
The initial layer is Layer:0. The raft layers are negative numbers so your first slow layer would be the first layer of the part.
In higher layers then yes, that setting wouldn't work for you. Instead, you can find the layer (minus "1") in the gcode and manually add an M220 command. (M220 S50 would tell the printer to compute all of the speed entries at 50%.) At the next layer you would add M220 S100 to return the printer to 100% feedrate.
The Search and Replace plugin will accept multiple commands as replacement text so long as they are separated by "\n" (backslash+n) the new line character. You would want two instances of Search And Replace active. (Extensions menu, Post-Processing | Modify Gcode and then Add a Script).
So you are looking at your preview and you see that at layer 29 a feature starts on top of the support and you want to slow down to 33% for it. (Again - remembering that Cura is base 1 and gcode operates from base 0:
Search = ;LAYER:28
Replace = ;LAYER:28\nM220 S33
(By putting the "LAYER:28" comment line back in the gcode it remains easily searchable.)
The next instance of Search and Replace might be configured:
Search = ;LAYER:29
Replace = ;LAYER:29\nM220 S100
For each layer you want to slow down for, you can add two more Search and Replace instances. One will reduce the speed at the layer of interest, and the next will return the speed to 100% at a later layer.
Edited by GregValiant-
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GregValiant 1,342
There are at least 3 ways. I think this is the one you are looking for.
In Speed - set the "Number of Slower Layers" to 1. That will make the "Initial Layer Speed" setting visible and you can enter whatever you like for the first layer.
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rachael7 74
Thanks for the reply. As far as I understand though, that only applies to the first layer against the buildplate. If the first layer of the material is not on the bed, as would happen if you printed a raft from the other material or when it is a bottom layer that occurs higher up (like an overhang), then the initial layer speed does not apply. Is that understanding incorrect?
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