Would it be possible to make slic3r compensate for the "springiness" in bowden extruders so that it extrudes a little extra material at the beginning of a move (since some of the extrution will build upp pressure in the bowden tube) and a little less during the last part (where the pressure in the bowden tube "help" with the extrution) so that the preassure in the bowden tube is close to zero at the end of the line. https://reprap.org/forum/read.php?263,182486,182486#msg-182486 Wed, 16 Sep 2026 12:30:26 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?263,182486,184551#msg-184551 https://reprap.org/forum/read.php?263,182486,184551#msg-184551 -------------------------------------------------------
> nikbjo Wrote:
> --------------------------------------------------
> -----
> > It's a loot easier to do in the slicer than in
> > firmware since you have to analyse the
> extrution
> > and its even if it could possible be done with
> > look ahead functions in firmware you have alot
> of
> > more time for computations during slicing.
> >
> > After looking a little on skeinforge the
> Oozebane
> > script seems have that finction.
>
> NO. Because the firmware synchronizes the axis
> together so you can not have the extruder start
> before the x or y unless it is done in the
> firmware or is just a blob before the axis starts.
>
It doesnt have anything to do with syncronization of axis, the slicer specifies how much to extrude during each move. The slicer increase the extrution during the first part of a "line" for example during a 1 mm long move, and extrudes a little less during the last 1 mm of the line.]]> nikbjo Slic3r Thu, 14 Feb 2013 04:19:34 -0500 https://reprap.org/forum/read.php?263,182486,184490#msg-184490 https://reprap.org/forum/read.php?263,182486,184490#msg-184490 -------------------------------------------------------
> I think advance was created to compensate for the
> normal lagging response of the hot end, not for
> Bowden hysteresis. Are you saying it is totally
> broken, or just doesn't work for Bowden?

Not sure but from my testing it did not work with a Bowden. Also other people that have tested it say it does not help, but I do not know the official state of it. It looks to have been implemented and never changed or updated as far as documentation is concerned.

From my findings all it did was move the bump around a little. I tried values from 0.001 to -0.001 where it did move the bump as stated but did not reduce it in anyway.]]> Sublime Slic3r Wed, 13 Feb 2013 21:06:22 -0500 https://reprap.org/forum/read.php?263,182486,184486#msg-184486 https://reprap.org/forum/read.php?263,182486,184486#msg-184486 nophead Slic3r Wed, 13 Feb 2013 20:39:49 -0500 https://reprap.org/forum/read.php?263,182486,184449#msg-184449 https://reprap.org/forum/read.php?263,182486,184449#msg-184449 -------------------------------------------------------
> It's a loot easier to do in the slicer than in
> firmware since you have to analyse the extrution
> and its even if it could possible be done with
> look ahead functions in firmware you have alot of
> more time for computations during slicing.
>
> After looking a little on skeinforge the Oozebane
> script seems have that finction.

NO. Because the firmware synchronizes the axis together so you can not have the extruder start before the x or y unless it is done in the firmware or is just a blob before the axis starts. Oozebane is for DC extruders, oozestep was for stepper extruders and bowdens but was never actually part of SF. The only thing SF officially had to try and deal with bowden cables is called dwindle and it results in under extrusion.

Marlin has a function called "advance" that is supposed to de-synchronize the axis but does not work properly, but is the only way to deal with hysteresis if it was actually an issue that could not be overcome with other settings like acceleration and jerk.]]> Sublime Slic3r Wed, 13 Feb 2013 16:43:17 -0500 https://reprap.org/forum/read.php?263,182486,184447#msg-184447 https://reprap.org/forum/read.php?263,182486,184447#msg-184447
After looking a little on skeinforge the Oozebane script seems have that finction.]]> nikbjo Slic3r Wed, 13 Feb 2013 16:34:11 -0500 https://reprap.org/forum/read.php?263,182486,182624#msg-182624 https://reprap.org/forum/read.php?263,182486,182624#msg-182624 -------------------------------------------------------
> Would it be possible to make slic3r compensate for
> the "springiness" in bowden extruders so that it
> extrudes a little extra material at the beginning
> of a move (since some of the extrution will build
> upp pressure in the bowden tube) and a little less
> during the last part (where the pressure in the
> bowden tube "help" with the extrution) so that the
> preassure in the bowden tube is close to zero at
> the end of the line.


That should not be possible since it is your firmware that syncs the axis together so the slicer can not make the filament start coming out sooner. If you increase your acceleration the hysteresis will be greatly reduced. Also the only thing a Bowden extruder needs from the slicer to get better results is during retraction to make sure the head does not sit still while retracting.]]> Sublime Slic3r Wed, 06 Feb 2013 18:28:03 -0500 https://reprap.org/forum/read.php?263,182486,182561#msg-182561 https://reprap.org/forum/read.php?263,182486,182561#msg-182561 Sound Slic3r Wed, 06 Feb 2013 13:59:23 -0500 https://reprap.org/forum/read.php?263,182486,182486#msg-182486 https://reprap.org/forum/read.php?263,182486,182486#msg-182486 nikbjo Slic3r Wed, 06 Feb 2013 08:58:34 -0500