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.