Latest firmware, retraction on abort?

[braddock 1]

Hi guys, I updated the firmware the other day, and since then, occasionally, but not every time I abort a print, the filament retracts a good 4 inches or so... this basically means i have to pull the hot end apart each time to clear the stringy left overs. Is this intentional? can it be changed back?

Cheers.

 

[IRobertI 429]

It is not intentional, it's a bug. Daid is aware and has fixed it for the next release. He's currently asking people to test the latest firmware to avoid similar bugs in the next release. If you want to you can get the new firmware here:

https://groups.google.com/forum/#!topic/ultimaker/tDKAHxe8rI0

 

[gr5 963]

You don't have to clean out the stringy leftovers - just feed the filament back in and push them into the melt chamber.

 

[braddock 1]

You don't have to clean out the stringy leftovers - just feed the filament back in and push them into the melt chamber.

 

I havent been able to do that, once it retracts that far, there's a blob at the very end, then thin string leading back to the main filament. This seems to cause an obstruction. I can't do a material change because the knurled wheel cant grab the thin stringy stuff... so I have to pull the bowden tube out of the hot end, move the material forward, cut it, then put it back together.

 

[woofy 12]

The excessive retract bug is fixed in Daid's latest test code. I'm using it and it works. There's an issue with the new cool down temperature display but that's just cosmetic.

Use lRobertl's link above to get it.

 

[gr5 963]

I can't do a material change because the knurled wheel cant grab the thin stringy stu

 

I don't get it. Why would you do a material change? Why not just go to the "move material" menu and have the extruder push it back into the print head?

 

[braddock 1]

the retraction was messy, a long stringy bit, and a fat blob on the end, moving the material forward was just bunching it up in the tube, and causing an obstruction, plus, I've been having lots of issues with nozzle blocks and under extrusion, so trying to keep things as clean as possible.

 

 

I don't get it. Why would you do a material change? Why not just go to the "move material" menu and have the extruder push it back into the print head?

 

[braddock 1]

thanks for the help, I've installed the update.

 

[apicalreform 1]

Hello,

I have been using the Ultimaker 2 for less than a month now with Cura 15.04. So I don't think my issue can be solved the same way but what Braddock describes seems to be what is happening with me.

As I'm still learning the best ways of using the Ultimaker I keep trying different settings and many times they fail, when this happens I usually abort the print and start again with new settings.

Lately (since I started using ABS, I don't know if it is a coincidence) every time I abort I have to retrieve the filament and feed it again. What has been happening is that when I abort it retrieves the filament further than it should. Some times a small piece of the filament breaks and stay near the nozzle and other times the flat bubble that Braddock describes happens. Also if I start a new print the filament is not pushed all the way up to the nozzle so it takes up to 2 minutes to start extruding.

Is it a bug or is there a better way of aborting a print and starting a new one?

Best regards

[tinkergnome 590]

Is it a bug or is there a better way of aborting a print and starting a new one?

 

Probably you are running into this similar bug now?

As a workaround you can prime the nozzle manually with the "Move material" function (as needed).