Gcode ordering curiosity
I am trying to trace a problem with my printer that has caused me to look at the Gcode produced by PrussaSlicer.
M203 sets maximum feed rates in the 'current units' but I see this line always precedes G21 which sets the units to mm. I don't think this is the cause of my Z lift problem but it does seem odd. Does anyone have an explanation?
RE: Gcode ordering curiosity
What do you have in your Printers Start Gcode in Printer Settings ?
RE: Gcode ordering curiosity
@neophyl
Hi neophyl,
Thanks for your input. I realise I didn't explain why I was asking about the relative positions of the lines of Gcode - I often get a screech of Z motors at the start of a print, wrong Z positions and a print that is obviously going to fail. I was suspicious of the line "G1 Z5 5000" which you have identified as coming from the Start Gcode.
I wondered why the print always started by lifting (or trying to lift) the nozzle.
The start G code was :
G28 ; home all axes
G1 Z5 F5000 ; lift nozzle
I'm going to insert G21 before this and drop the speed to F500, even though the earlier M203 should have dealt with the unreasonably high speed.
I certainly haven't changed the 'Start Gcode' section so I don't know why it is misbehaving now (after at least a couple of years of proper operation) and why sometimes it still works fine