downeym
Posts: 7
Joined: Mon Dec 28, 2015 7:10 pm

Ooze shield retraction

Mon Dec 28, 2015 7:14 pm

I am trying to use the ooze shield on a dual extrusion print, but I am running into issues with retraction. I have my retraction settings working well for each extruder and I dont see any ooze when I print parts using single extrusion mode, but when I print dual extrusion parts, I get a lot of ooze between the prime pillar and ooze shield movements. I dont think that the slicer is retracting at all when printing either of these objects. the part looks great, but I get ooze between the ooze shield and the part, which kind of defeats the purpose.

Is there a setting I am overlooking to enable the standard retraction settings when printing the ooze shield and prime pillar, or is this a bug that hasnt been fixed yet?

CompoundCarl
Posts: 2005
Joined: Wed Aug 05, 2015 7:23 am

Re: Ooze shield retraction

Tue Dec 29, 2015 6:04 am

It already retracts when moving from the ooze shield to the object. Just look at the gcode. It's already doing it correctly.

But it's very possible your retraction settings aren't high enough, so you are still getting stringing. There's plenty of retraction test prints you can do to verify this.

downeym
Posts: 7
Joined: Mon Dec 28, 2015 7:10 pm

Re: Ooze shield retraction

Tue Dec 29, 2015 12:32 pm

that is not the case. here is the G-Code it generated for the prime pillar. As you can see, there is no retraction between the pillar and the ooze shield, even though it is set for 6.5mm retraction, which I can see when it is printing the actual object.

T1
; tool H0.300 W0.400
; prime pillar
G1 X32.057 Y52.335 F4800
G1 Z0.270 F1000
G92 E0
G1 X32.057 Y66.935 E0.6556 F3780
G1 X17.457 Y66.935 E1.3111
G1 X17.457 Y52.335 E1.9667
G1 X32.057 Y52.335 E2.6222
G1 X31.739 Y52.475 F4800
G92 E0
G1 X31.917 Y52.653 E0.0113 F3780
G1 X31.917 Y53.218 E0.0367
G1 X31.174 Y52.475 E0.0839
G1 X30.608 Y52.475 E0.1093
... (cut out the middle moves to make this shorter)
G1 X18.907 Y66.795 E24.1873
G1 X18.341 Y66.795 E24.2127
G1 X17.597 Y66.051 E24.2599
G1 X17.597 Y66.617 E24.2853
G1 X17.775 Y66.795 E24.2966
; ooze shield
G1 X34.277 Y63.443 F4800
G92 E0
G1 X34.368 Y63.044 E0.0184 F3780
G1 X34.540 Y62.807 E0.0315
G1 X34.588 Y62.512 E0.0449
G1 X34.601 Y62.454 E0.0476
G1 X34.887 Y61.461 E0.0940


There are also no retraction commands happening between different sections of the ooze shield, even though the extruder is moving across the part. This results in a ugly string of ooze across the part.

outer ooze shield to inner ooze shield.
....
G1 X34.973 Y67.094 E21.3375
G1 X34.661 Y65.741 E21.3998
G1 X34.657 Y65.718 E21.4009
G1 X34.269 Y63.575 E21.4987
G1 X34.286 Y63.494 E21.5024
G1 X34.277 Y63.443 E21.5048
G1 X63.787 Y59.343 F4800
G92 E0
G1 X64.039 Y60.522 E0.0541 F3780
G1 X64.487 Y60.487 E0.0743
G1 X64.953 Y60.280 E0.0972
G1 X65.310 Y60.283 E0.1132
G1 X65.506 Y60.211 E0.1226

There is clearly a bug unless there is a setting I am not seeing for retraction specifically for the pillar and shield.
Attachments
2color_treefrog_big_hollow_v2.gcode
(2.42 MiB) Downloaded 134 times

CompoundCarl
Posts: 2005
Joined: Wed Aug 05, 2015 7:23 am

Re: Ooze shield retraction

Wed Dec 30, 2015 6:37 am

It's worked with every part I've sliced and tested, so it's probably one of your settings that is preventing retraction. Why don't you post your factory file so that others can take a look. The gcode file isn't all that helpful.

downeym
Posts: 7
Joined: Mon Dec 28, 2015 7:10 pm

Re: Ooze shield retraction

Wed Dec 30, 2015 11:41 am

I am attaching the factory file.

thanks
Attachments
2color_treefrog_big_hollow.factory
(13.88 MiB) Downloaded 145 times

downeym
Posts: 7
Joined: Mon Dec 28, 2015 7:10 pm

Re: Ooze shield retraction

Sun Jan 03, 2016 4:09 pm

As you can see from the factory file, the retraction was set to 6.5mm and the generated gcode is doing this retraction on the part itself, but there is no retraction when printing the ooze shield and prime pillar, which defeats the entire point of the shield.

Anyone else seeing this bug?

horst.w
Posts: 852
Joined: Fri Oct 17, 2014 5:00 pm

Re: Ooze shield retraction

Sun Jan 03, 2016 5:35 pm

Are you sure that is what you want to print?


H.

... only deactivate the oozeshield and the pillar for better seeing.
I think it needs a toolhead-offset.
Frosch.jpg
I don't know why, but there is a offset for T1 set to -26,80. The 2 parts are coming together when the offset for T0 and T1 are zero and they are centered.
Additional the model has non-magnifold edges
Frosch2.jpg
Frosch2.jpg (8.87 KiB) Viewed 4851 times
Last edited by horst.w on Sun Jan 03, 2016 6:16 pm, edited 1 time in total.

downeym
Posts: 7
Joined: Mon Dec 28, 2015 7:10 pm

Re: Ooze shield retraction

Sun Jan 03, 2016 5:41 pm

The offset is just in the display due to the 2 heads. The part prints correctly, with the exception of the oozing problem.
Attachments
photo (7).JPG

horst.w
Posts: 852
Joined: Fri Oct 17, 2014 5:00 pm

Re: Ooze shield retraction

Sun Jan 03, 2016 6:26 pm

... that is what I don't understand. The model is shown correctly in the setting-window, but in the print-preview it is deformed. Very strange!

H.

downeym
Posts: 7
Joined: Mon Dec 28, 2015 7:10 pm

Re: Ooze shield retraction

Sun Jan 03, 2016 10:43 pm

its not deformed,. it is only reflecting the offset between the two nozzles of 26.8mm

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