le_avion
Posts: 12
Joined: Fri Feb 24, 2017 9:46 pm

Problem: S3D makes Ultimaker 3 Extended extrude in the air!

I have printed successfully on the Ultimaker 3 Extended using Cura but this is the 1st time that I am trying to use S3D generated gcode since I really dislike Cura. I started with the S3D machine configuration and I then defined the two filaments and their temperatures and set the left extruder as the primary extruder and the right extruder for support. When I start the print I run immediately into issues, all on the 1st layer:

When starting to print the prime pillar the extruder starts hitting the bed very fast and it sounds like a woodpecker.
Then it moves on to start printing the actual object's 1st layer and it prints it in the air. The extruder stays 2-3 mm above the print bed and extrudes while moving as if it is trying to print.

I wonder if the issue is caused by the prime pillar.

At this point I aborted the print since there was no sense in continuing.

I have attached the factory file in case it helps.
UM3_24_14_TRex_Hip_Bottom_fixed_double.factory
Factory file of the object I am trying to print
(1.98 MiB) Downloaded 513 times
and the gcode file (zipped due to size)
UM3_24_14_TRex_Hip_Bottom_fixed_double.gcode.zip
Gcode file generated by S3D zipped for size
(15.86 MiB) Downloaded 387 times
Any idea what the problem may be and what is the solution?
horst.w
Posts: 861
Joined: Fri Oct 17, 2014 5:00 pm

Re: Problem: S3D makes Ultimaker 3 Extended extrude in the a

I think, there is a missmatch with number of processes and Start-Stop values in their Advanced-Tab in accordance to LayerHigh a.s.o.. Perhaps!
But sure is, that you can't use pillar when more than one process is in use. Why - that a secret of the developers.

Normally the gcode seems ok, the print is starting with Z = 0.140 mm. (sliced on my installation)

The settings for FirstLayer are very uncommon! What the 2nd process is doing? I don't find out a difference exept skirt/ brim

What the printer is doing when it prints a normal cylinder or cube?


Regards
horst.w, GER
le_avion
Posts: 12
Joined: Fri Feb 24, 2017 9:46 pm

Re: Problem: S3D makes Ultimaker 3 Extended extrude in the a

I made a two changes:

1. I am now using a single process to see if it indeed helps
2. I moved the prime pillar from the North-East to the South-East. The reason for the knocking was when trying to print the pillar the print head would hit the part that pushes the extruder 2 lever to move it up or down.

These didn't help. The print head still hits the right side when printing the pillar and unfortunately S3D doesn't allow setting an offset from the plate side so it tries to put the pillar too far out. I will open a ticket about it.

Also, I had the same issue of extruding couple of mm off the glass plate, i.e. in the air.

My next experiment will be to try with no pillar and see if it helps.
horst.w
Posts: 861
Joined: Fri Oct 17, 2014 5:00 pm

Re: Problem: S3D makes Ultimaker 3 Extended extrude in the a

When the printhead is knocking against the pillar, it is to high and the questions is, why?

1st, there is an over extrusion, otherwise
the material is too soft because the cooling is not sufficient and some other causes like the differnet temparatures 215 / 250;

2nd the heat bed is bending by temperature strain
Last week we had in german forums 2 cases of this occurrence; it needed a longer time to find out, because to realize it by only looking is very difficult.

H.
le_avion
Posts: 12
Joined: Fri Feb 24, 2017 9:46 pm

Re: Problem: S3D makes Ultimaker 3 Extended extrude in the a

As mentioned above, I tried again, this time without the pillar and there in no knocking anymore but still printing is not successful. Now nothing gets extruded from extruder 2, the right one used for PVA support material. The print head does all the right moves but nothing is coming out from the extruder. To verify that it's not a hardware issue I used Cura instead of S3D using the same temperatures and it is working fine. As a matter of fact it is printing the T-Rex lower hip as I am writing this.

Maybe someone good at reading g-code can compare the code generated by the two programs and figure out what is the issue but I will need to wait few days for the print to complete before I can do that because I changed the object position in order to be able to slice it with Cura. I should generate the g-code when both programs have more-or-less the same object position and test to make sure the problem is not position specific.
horst.w
Posts: 861
Joined: Fri Oct 17, 2014 5:00 pm

Re: Problem: S3D makes Ultimaker 3 Extended extrude in the a

That what I said, without any different processes the pillar is also printed. Perhaps a bug, perhaps a feature of S3D ;-) but well known now for yaers!

To test out your materials, print any object separatly with both to be sure, that the extruders are working fine.


H.

the model is turned in a different position ...
T-Rex.jpg
le_avion
Posts: 12
Joined: Fri Feb 24, 2017 9:46 pm

Re: Problem: S3D makes Ultimaker 3 Extended extrude in the a

horst.w wrote:To test out your materials, print any object separatly with both to be sure, that the extruders are working fine.
The materials and the extruders work fine as you can see from the same model that is currently being printed from the Cura slicing:
Cura print.jpg
One thing I like about how Cura does the pillar is that 1) it automatically puts it in a better location than S3D (you can partially see it behind the print head on the right side in the photo) and 2) it allows you to specify the exact position of the pillar by setting its X and Y positions.
horst.w
Posts: 861
Joined: Fri Oct 17, 2014 5:00 pm

Re: Problem: S3D makes Ultimaker 3 Extended extrude in the a

Cura is a half-automatical software and it sets a lot of things, which must be done in S3D by the user!

I have found one of them:
You dont adjust your settings in the start-code.

There are empty lines you need for the dual print.
For my printer-profil it is running all automatically .

You pull back 12 mm of filament when changing the toolhead, will say the top of filament ist out of range of heating area.
With restarting of this print-head there is no code to wait for heating up once more. Therefore the first some mm can not be printed, because the material is not molten at this moment.
May be one of the reasons for your problems. And I dont know why S3D doesn't fill up the emty lines in the code. I must test out it with my own printer profil, what S3D automatically writing to the code.

Lines 220 & 236 & 237

See you later ...
Tool-change.jpg
No-M104.jpg

H.
horst.w
Posts: 861
Joined: Fri Oct 17, 2014 5:00 pm

Re: Problem: S3D makes Ultimaker 3 Extended extrude in the a

In the meantime I have build an own examble with this thing http://www.thingiverse.com/thing:21773/#files

I have use the automatical function for dual print (Tools > ...) and the result is very different to yours. In >>> Scripts >> Startcode all lines are written as expected, only one issue is there to find: for purging the nozzles the T0 is 2-time used instead T0 / T1
And with the dual-assistant the printing of the pillar is no problem.


Its clear, this examble with 2 different parts is not the same as yours with only one part and the support for the 2nd nozzle.
Tomorrow I want to try out this

H.
Cone-Pillar.jpg

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