What types of move should the speed factor affect?

TC

@dc42 I agree, that sounds like a good way to do it.

danzaywer

@dc42 I agree

DocTrucker

I'd be tempted to exclude z only moves so z hop can be dialled-in, in a similar way to retraction and the speed up not effect it. Negligable effect on overall build time in most builds.

Phaedrux

@DocTrucker said in What types of move should the speed factor affect?:

I'd be tempted to exclude z only moves so z hop can be dialled-in, in a similar way to retraction and the speed up not effect it. Negligable effect on overall build time in most builds.

Perhaps M207 could be extended to include Z hop speed?

https://duet3d.dozuki.com/Wiki/Gcode#Section_M207_Set_retract_length

deckingman

Does the speed factor override also override the acceleration rate or just the speeds after the acceleration phase? Because if it doesn't affect the acceleration rate, then short moves like Z hop are likely to be unaffected because they will either be accelerating or decelerating and never attain the set Z speed in any case.

dc42

@Phaedrux said in What types of move should the speed factor affect?:

@DocTrucker said in What types of move should the speed factor affect?:

I'd be tempted to exclude z only moves so z hop can be dialled-in, in a similar way to retraction and the speed up not effect it. Negligable effect on overall build time in most builds.

Perhaps M207 could be extended to include Z hop speed?

https://duet3d.dozuki.com/Wiki/Gcode#Section_M207_Set_retract_length

Z-hop is generally so short that in practice it is acceleration-limited.

dc42

@deckingman said in What types of move should the speed factor affect?:

Does the speed factor override also override the acceleration rate or just the speeds after the acceleration phase? Because if it doesn't affect the acceleration rate, then short moves like Z hop are likely to be unaffected because they will either be accelerating or decelerating and never attain the set Z speed in any case.

Acceleration and jerk are not affected by M220.

peter247

@dc42

I'm with the only X and Y moves .

Any news if this is going to be changed ?

dc42

From the version 3.1.0 change list at https://github.com/Duet3D/RepRapFirmware/blob/v3-dev/WHATS_NEW_RRF3.md:

The speed factor (M220) is no longer applied to extruder-only moves or to movement commands in system or user macro files

Antomy5

Thanks for asking this thread. I don't know much about this speed factor. But I am interested and I would like to get some more details.