Thank you for the reply.
I do understand your point about not returning to an existing layer and that being a bad thing to do. I’m printing TPU, though, and the layer after the pause is not bonding well at all with the previous layers, so I thought (not understanding the way the extension is supposed to work, I admit), that revisiting an existing layer would possibly work and cause no harm with the TPU having some give.
I am curious, however, why the display on my machine clearly showed z=4.3 the first layer after the pause, then it went back to z=4.1, and then back up to z=4.3? From what you described, that should be impossible, shouldn’t it?
I do like your option of adding some code manually to increase flow. For TPU on my machine, I already use a flow rate of 114%. Would I do M221 S130 (or so) and then M221 S114 to return? Or is the S100 100% of my set flow of 114%?
It doesn't work that way. Cura will not allow itself or the plugin to crash into a part and it appears you want it to go where plastic has already been placed. That qualifies as a Bad Thing because there just isn't anywhere for the plastic to go, and the head might move the print.
What the redo does is repeat the layers but continuing upwards.
(Cura layers start at 1 and Gcode layers start at 0. The numbers below are Gcode layer numbers.)
Layer 18 at 3.9
Layer 19 at 4.1
;Pause before layer 20
Repeat Layer 18 at 4.3
Repeat Layer 19 at 4.5
Layer 20 at 4.7
Layer 21 at 4.9
I haven't used the redo. Instead, I hand code an M221 S110 when the print resumes and increase the flow for the first layer after the pause. The 2nd layer after the pause gets an M221 S100 to return the flowrate back to 100%.
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