How can I slow down the Layer:2 WALL-INNER Feedrate

[stonethrow 0]

The first layer of print is beautiful with an extrusion G-code feedrate of F600. Then for subsequent layers the feedrate jumps up to F1300 and extrudes too much material making all of the rest of the layers bumpy and overlapped.

Can anyone tell me what Cura config value I must change to decrease the extruder feed for subsequent layers?

;LAYER:2

;TYPE:WALL-INNER

G1 X-9.35 Y-9.35 Z0.6 F1733.3333

G1 X9.35 Y-9.35 F1300.0 E0.8789

Thanks,

[msurunner 2]

Your feed rate should be a byproduct of the speed you are printing. The E value should be the determinant on the amount of material fed. If you have already done the Cura first step wizard to get an approximate value of steps/e then you probably need to adjust filament size. You could get that feed rate back to 600, though, by matching your print speed with your first layer speed.

[Daid 306]

Feedrate has nothing to do with the amount of material extruded. Feedrate is actually movement speed (the name comes from CNC milling, where feedrate is how fast you feed it new material to cut)

The E values control how much material is pushed down the nozzle. Combined with the M92 Exxx which sets the amount of stepper motor steps needed for 1mm of material extrusion.

[stonethrow 0]

Our extruder motor is spinning too fast. Changing the printing speed doesn't seem to affect the extrusion speed that much. Can you tell me what the printing speed setting actually controls?

Should we be setting the travel speed down instead?

Thanks

[Daid 306]

Are you using an Ultimaker? I assume you are.

Most likely there is a problem with the microstepping settings then. Check the jumpers on the board compared to this photo:

http://wiki.ultimaker.com/File:Circuit_complete.jpg

The jumpers are near the stepper drivers.

[stonethrow 0]

We're actually using our own geared motor on a different system but using Cura for the slicing.

Is it the packing density setting that changes the extruder feed rate in the G-code? It seems that increasing the packing density setting decreases the extrusion feedrate. Is this right?

Thanks

[Daid 306]

Yes. The packing density reversely effects the extrusion amount.

But what you want to adjust, is the "steps per E", you need to tel the firmware how many stepper steps you need for 1mm of extrusion.