[Major issues on Ultimaker S3 Motherboard (bed continuoulsy heating, and hot electrical components)]

Hi,

 

I recenlty had majors issues with my ultimaker S3.

 

On the last print, the bed started to heat continuoulsy which led to very high temperature (way more than the set temperature) which led to a break of the glass bed and the burn of the glue on it (c.f. picture 1). After reboot, I realized that the bed was always heating even with temperature set to 0.

 

Picture 1.

 

I opened the printer to see what could be wrong with the motherboard and I discovered that some oil that was on the vertical rods dropped on the motherboard. The right vertical rod opening is located just above the motherboard. The result was that 2 diodes that are used in the regulation of the bed heating were grilled (c.f. picture 2).

 

Picture 2

 

I replaced diode 1 with a Zener 30V, and diode 2 with a 2A 200V rectifier diode. The result can be seen in picture 3 and 4.

 

Picture 3

Picture 4

 

Now the printer is back to normal behaviour. It does not heat if heating is not requiered and the regulation is good for all checked temperatures (from 50°C to 110°C).

However, the mofset (component 3 in picture 2) is really hot when the bed is around the set temperature. If heating is not activated the component is cold, is temperature is increasing to reach the set temperature the component is cold, but when the regulation is performed around the set temperature, the component gets really hot (maybe around 80°). I tried to rework the heat junction of the component (on the left) to improve the heat transfer but it does not help and the pcb is already getting hot which implies that the heat transfer is good.

 

So, my question is, is this nominal bahaviour that this component gets so hot ? On the component datasheet, I read that the component can reach 150°C.

 

Thank you for help.

 

[Prints gets bent from a specific Z position on my Ultimaker S3]

Using my ultimaker S3, the prints get bent from a specific Z position.

 

Here is an example in the following picture:

 

I repeated the print and got exactly the same result.

 

What could be the cause of this issue and how to solve it ?

 

[Newer model S5 screen goes black and unresponsive]

I have the same problem on a S3 printer with the latest firmware 8.2.1

[Issue with Cura and thin layers. Cura is modifying the 3d geometry.]

I do agree that your last picture is a great example of geometry alteration 😉

 

I just tried with Cura 4.13.1 and I get the result that I was expecting. I will stay on this version untill the Arachne switch is implemented in the latest version of Cura.

 

[Issue with Cura and thin layers. Cura is modifying the 3d geometry.]

14 minutes ago, GregValiant said:

"Wall Transitioning Threshold Angle"

As the inner diameter approaches the exterior wall Cura is making adjustments to the line width.  At the default value of 10° - Cura stops extruding, makes a minor adjustment, and then continues with a single extrusion for the narrow part of the wall.  That will often leave a mark.

 

With the setting at 25° the situation is different and there is no "stop" to adjust the line width.

 

You can still see some slight variation there.  Whether those variations will show up in the print I don't know.

Cura is not "altering the geometry" but is making an adjustment to respect the geometry given the settings employed.

 

This is Cura 4.13.1 without the Arachne Engine Variable Line Width.  This is likely what you are seeing with Orca.

 

Thank you very much for this detailed answer.

 

I tried to play with the "Wall Transitioning Threshold Angle" parameter and it helped a little but there was still a little bit of deviation compared to the stl file (which can be observed in your second figure). And unfortunatly this is still visible in the prints and still is an issue as it is happening in the most critical part of the design.

 

Thanks to your help, I understand now that this is a feature of the new slicer engine (Arachne). Is is possible to switch off this feature or should I go back to Cura 4.13.1 to print this design?

 

 

[Issue with Cura and thin layers. Cura is modifying the 3d geometry.]

23 minutes ago, gr5 said:

It appears your CAD model has lots of inidividual, short planes on that outer wall.  So the outer wall is curved?  I'd try reducing the number of triangles output to STL in your CAD software.

 

Also there is some kind of resolution setting in Cura (I forget what it is called exactly) that might help if you increase the resolution but it might print worse because it will have more gcodes and many printers have problems if there are too many movements per mm (they stutter as the cpu can't keep up with the computations).

 

Thank you for your answer. The outer wall is not curved, it is perfectly plane. Also, with the same STL, Orca slicer provides a perfectly plane sliced model. I will however try to reduce the number of triangle and get back to you.

 

I tried to use the resolution parameters in cura but it dit not help with this issue.

[Issue with Cura and thin layers. Cura is modifying the 3d geometry.]

Also, this behaviour is not observed while using Orca Slicer with the same STL file.

 

[Issue with Cura and thin layers. Cura is modifying the 3d geometry.]

Hi,

I'm printing using an Ultimaker S3 and Cura slicer 5.4.0. When trying to slice thin walls (like the one in fig. 1), the slicer is not following the 3d geometry and will produce some small wall deformations (fig. 2 and 3). Is there a way to force the slicer to follow exactly the position of the outer wall?

 

Thank you for your help 🙂

 

Fig. 1:

Fig. 2:

Fig. 3: