Retraction on the fly

dc42

That's correct, when you use firmware retraction you need to define the retraction amount and speed using M207. You can do this in config,g and/or in the start gcode of your slicer.

Mike_F

Okay, thanks David. I will move the definition to the 'Start' code and have a play.

Dougal1957

also you will have to up the F parameter 1mm/sec retraction is very slow it will cost you around 15 secs on every retract cycle

The setting is specified in MM/Min so you need to multiply the figures by 60

Mike_F

Thanks, Dougal, I had already worked that one out before I started a print! It would have been painstakingly slow.

However, I have noticed that I am now getting far more retractions than I ever have done before. On a circular part with three perimeters, my printer is retracting at the end of each perimeter - never done that before. Also, with far more retractions, some of them on ridiculously small moves, the accumulation of all the retractions, in a small space, is causing some problems immediately after and some areas of infill/surface are sparse.

dc42

I think that's a limitation of S3D. It doesn't really understand firmware retraction. If it did then the options to set a minimum travel distance to retract for and whether or not to retract on layer change would still be available.

Martin1454

@dc42 Do you know why I can't tune this "on the fly"?

I tried, (using simplify3d), but i doenst respond to the change.

I dissabled retraction on extruder tab and enabled m101/102/103 on the gcode tab, and added an m207 line on my starting code.

I checked that i does not change by enabling and disabling Z hop in the M207 that i send through the web interface?

dc42

Test your M207 retraction settings by sending G10 and G11 commands from the GCode Console in DWC.

Martin1454

@dc42 nevermind - found the problem - for a brief moment, i frogot S3D have independent "retraction" settings for the 2 extruders, so I only dissabled one of them -.- Got it working now. - but thanks for the quick response.

Quick question - Does linear advance/pressure advance improve retraction?

deckingman

@dc42 said in Retraction on the fly:

I think that's a limitation of S3D. It doesn't really understand firmware retraction...............

If it did, it would use G10 / G11 too

dc42

@martin1454 said in Retraction on the fly:

Quick question - Does linear advance/pressure advance improve retraction?

When you use large amounts of pressure advance you may need to reduce retraction, because pressure advance will already retract filament towards the end of some moves.