Endless messages when printing or simulating
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According to http://reprap.org/wiki/G-code#M204:_Set_default_acceleration the parameters supported by Marlin since 2015 are T, P and R. So i guess S is particular to Prusa's fork of slic3r. RRF doesn't recognise the S parameter, so it sees M204 S1000 as having no parameters, and in common with the standard behaviour of RRF it reports the existing values.
I could have RRF recognise the S parameter, but it would be nice to know what it is supposed to do.
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@dc42 thanks for the response.
Yeah it looked like a mismatch of expected syntax for the command to me. Tbh I think I'll submit it as a bug on Prusa's fork and see what they say.
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It may be that Prusa's fork is derived from an old version of Marlin that supported the S parameter; or it may be that Marlin does support the S parameter now/still but they haven't updated the documentation at reprap.org.
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This thread seems to suggest S is a legacy parameter that sets both P and T to the same value:
https://github.com/alexrj/Slic3r/issues/2745
closed New Marlin acceleration M204 syntax #2745
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I've just checked the RRF code and the current version does recognise the S parameter of M204. Those of you having this issue, please update your firmware.
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@dc42 perfect! I've sent a message to the Prusa guys anyway as they might want to support the more up to date version for the command.
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From the whatsnew file entry for firmware 1.19:
- M204 S parameter is supported for backwards compatibility e.g. with Cura
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Ooh, that's interesting then. I came across this because of the acceleration message spam I was getting which I came to the conclusion might have been caused by the S parameter on the M204's but I'm pretty certain I'm on 1.20 (since I'm using senseless endstops).
I'll have a poke about then when I get home and see if it's not something daft I'm doing on my end.
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OK I've had a chance to test this out now.
Attempting to print a bench from Slic3r outputting M204 S commands is giving me buttloads of:
Maximum printing acceleration 1000.0, maximum travel acceleration 10000.0
However, replacing all of those M204 S commands with M204 P instead makes the messages go away.
My accelerations are set to (CoreXY rig):
[[language gcode]] M201 X2000 Y2000 Z250 E10000Edit:
Tested with M204 T now as well and the messages don't appear.
RRF v 1.20 -
I've just looked at the code again and realised that you need to have firmware compatibility set to Marlin for the M204 S parameter to be recognised. So check that you have M552 P2 in config.g.
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M555 P2 (which I figured out you meant) seems to do the trick with M204 S commands, cheers!
Are there any caveats we should be aware of when putting it into Marlin mode?
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Marlin compatible mode mostly only affects commands sent via USB or Telnet. There are no particular caveats.
