Slow all the time at 2000% speed

[engikeneer]

@jbourns what firmware flavour do you have set in PrusaSlicer? Should be Reprap.
If you leave it in Marlin, it puts a bunch of max speed commands in the start code in the Marlin units, so you end up 60x too slow

[Jbourns]

@engikeneer Its set to reprap/sprinter

[PaulHew]

How big and what are you trying to print?
If it is small and complex it might not be able to get up to speed.
When I print Pi cases my infill is going at 130mm/s. 3 perim, 3 top and bottom.

Got an stl?

[Jbourns]

@paulhew Its 38 x 45mm. I just don' t get why it wont increase in speed at all from DWC. I've always been able to crank it up to suit my needs. Now I'm stuck with a 6 hour print when it should have been done in 20min

fixture.stl

[PaulHew]

@jbourns This is my speeds config for a RailCore

M350 X16 Y16 Z16 E16 I1                          ; configure microstepping with interpolation
;
M92 X200.00 Y200.00                              ; set steps per mm
M92 Z1600                                        ; set steps per mm Z Axis
M92 E412                                         ; set steps per mm Extruder
;
M566 X600.00 Y600.00 Z200.00 E3600.00            ; set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z900.00 E3600.00          ; set maximum speeds (mm/min)
M201 X1500.00 Y1500.00 Z250.00 E1500.00          ; set accelerations (mm/s^2)
M906 X1280 Y1280 Z1220 E700 I30                  ; set motor currents (mA) and motor idle factor in per cent

My E speeds are higher.
I run a BMG Extruder with a mosquito hotend.

I will give you part a run later, nearly 1am here in the UK.

[PaulHew]

Also, in PS, filament tab, what is your max volumetric speed?
That can play a major part in speed.

[Jbourns]

@paulhew I'll give those a go, Thanks for the help. I'll be testing them in the next hour once this part is printed.

[PaulHew]

@jbourns

[Jbourns]

@paulhew It's at 0 which is default so I assume that's off?

[PaulHew]

@jbourns I found this for calculating Volumetric speed.
https://docs.google.com/spreadsheets/d/1ZHSRzTm2AR_sXnLSSOq2NSmx0UYtF5bJKHUSFWiDscA/edit#gid=0

[Jbourns]

@paulhew 10mm/3 seems like a good middle ground for the volcano

[Jbourns]

@paulhew The only explanation is that im a daft prick. I think i fugged up my E speeds ands acceleration at some point. Doesn't explain why I couldn't just override it.
https://youtu.be/tr7fGtmQUk8

[dc42]

@jbourns the speed multiplier will override the speeds requested in the F parameter of G1/2/3/4 commands, but not the machine speed limits set by M203.

[alankilian]

@jbourns YEAH!!!

Thanks for keeping us in the loop and letting us know when you figured it out.

[Jbourns]

It was either volumetric flow in prusa slicer or max speed in the config

[JoergS5]

@jbourns trying a different slicer and then testing 2000% let's you decide whether the problem is in the slicer region or in the config/dwc region.