Hello, I am new to 3D printers, I have a question

[Ayman1612 0]

Hello, I am new to 3D printers, I have a question, what is the function of the communication cable, what does it do, if I disconnect it, what happens?

 

Edited August 18, 2022 by Ayman1612

[Smithy 1,136]

The cable is needed to heatup the print cores, measure the temperature, switch the print cores, power for the fans.

When you disconnect it your printer will not work anymore.

[Ayman1612 0]

Thank you very much, I have another question, how does the nozzle heat up with the help of what? A heat spreader, if so, where is it?

[Smithy 1,136]

The heater cartridge and temperature sensor are controlling it and they are built into the print core.

[Smithy 1,136]

The heater and sensor are in the brass block of the nozzle:

[Ayman1612 0]

Is there a fan that cools it?  how does she cool down

[MariMakes 170]

Hey,

I don't know if this helps but I have a list of components of the printcores here:

https://github.com/Ultimaker/Ultimaker3/blob/master/BOM/subBOM Ultimaker Print Core AA 0.4.pdf

 

There is a single fan in the front, and two radial fans at the side of the printhead. 

https://support.ultimaker.com/hc/en-us/articles/360011527340-Check-the-Ultimaker-3-front-print-head-fan

[Ayman1612 0]

2 hours ago, Smithy said:

Thank you very much, you helped me a lot, I have one last question when to use filament 1.75 and when to use 2.85?

 

 

[Smithy 1,136]

For your printer the UM3, you always use 2.85 filament.

Other printers use 1.75, so it is depending on the printer itself.

[Ayman1612 0]

According to what I see, there is a heatsink and there is also a 25 watt cartridge heater, what is the difference in roles?

 

[Ayman1612 0]

Is it possible to put 2 AA type nozzles?

 

[Smithy 1,136]

Sure you can put 2 AA print cores in the printer.

[Ayman1612 0]

What is the difference between j (heatsink) and F (heater cartridge) what is the role of each of them? I would love to know and sorry if I dug you up

[Smithy 1,136]

I don't understand your questions or why you are asking about such things.

But anyway....

The heater cartridge heats up the nozzle to be able to melt the filament.

The heatsink cools the upper part of the print core which is important that only the nozzle itself is hot.

[Ayman1612 0]

, thank you very much, last question and this is it, when do I use both nozzles together Aa and Bb??

[Smithy 1,136]

You use both nozzles when you want to print with two materials  i.e. two colors.

The BB printcore is only for PVA filament, which is a support material.

[gr5 2,026]

For your first few 100 prints I recommend you try to stick with PLA only as that is the easiest material to print with and you will gain an understanding of what is dependable and what isn't.

 

PVA is tricky as you need to keep it incredibly dry.  Some dessicant is not good enough.

[Ayman1612 0]

8 hours ago, Smithy said:

You use both nozzles when you want to print with two materials  i.e. two colors.

The BB printcore is only for PVA filament, which is a support material.

What does support material mean? Like what is the role

[GregValiant 1,042]

You can't print over air.  Portions of a model that are less than about 30° from horizontal need support to print on.  Usually, that support is the same material as the print and so it can become welded to the print and requires later post-processing to get rid of the support and to finish the surface of the model where the support was attached.

If you have a dual extruder printer then you can load a different material into one of the extruder/hot ends.  That "support material" won't stick nearly as well and is much easier to remove.  If you were to use PVA - it is water soluble and a good soak will get it off but as @gr5 points out it is fussy to keep in printable condition.

 

If you you print a model with say PETG and the support material is also PETG then you will need to invest in a hobby knife (Exacto knife), a set of pics, and a good pair of needle nose pliers, to poke and prod and pull at the support to divorce it from the model.  A set of micro-files will help you to clean up the model.

Here you can see the support is cyan colored.  On the right the Support Interface is a darker blue.  The center support is there for the roof of a blind hole and is tough to get out.

 

Here is my tool set.

Not shown are the band-aids for use when the knife slips.  Also not shown is the extensive list of dual-purpose swear words for when either the knife slips or I accidentally cut off part of the model instead of the support.

 

[Ayman1612 0]

19 minutes ago, GregValiant said:

You can't print over air.  Portions of a model that are less than about 30° from horizontal need support to print on.  Usually, that support is the same material as the print and so it can become welded to the print and requires later post-processing to get rid of the support and to finish the surface of the model where the support was attached.

If you have a dual extruder printer then you can load a different material into one of the extruder/hot ends.  That "support material" won't stick nearly as well and is much easier to remove.  If you were to use PVA - it is water soluble and a good soak will get it off but as @gr5 points out it is fussy to keep in printable condition.

 

If you you print a model with say PETG and the support material is also PETG then you will need to invest in a hobby knife (Exacto knife), a set of pics, and a good pair of needle nose pliers, to poke and prod and pull at the support to divorce it from the model.  A set of micro-files will help you to clean up the model.

Here you can see the support is cyan colored.  On the right the Support Interface is a darker blue.  The center support is there for the roof of a blind hole and is tough to get out.

 

Here is my tool set.

Not shown are the band-aids for use when the knife slips.  Also not shown is the extensive list of dual-purpose swear words for when either the knife slips or I accidentally cut off part of the model instead of the support.

 

If I understood correctly, I can make a support with a material other than pva, but it will be difficult to hide the support later?

[Enigma_M4 98]

Support is always waste material, which is meant to be removed after the print is finished.

With single extruder printers (only one nozzle), it's the same material as the "main" print, with dual extruder printers (like the UM3, two nozzles), you can chose a different material for support, like PVA, which is water soluble (so you just can submerge your finished print in a bucket of water and after some hours the support is gone itself), or breakaway, which has to be removed manually, but is easier to remove than normal print materials.

[Ayman1612 0]

How do I define where I want support?

[gr5 2,026]

Cura does support mostly automatically.  It's more that you tell cura where you *don't* want support.  Cura is somewhat smart about positioning the support but sometimes makes dumb decisions.  The first level of control is that you can select "support everywhere" or "no support" or "support touching buildplate".  With the last option it won't put support in holes half way up your model but will suport things that have only air under them.

 

Also you can set the support angle. overhangs at 45 degrees are trivial to print.  As the support angle gets steeper, it is more likely you need support.  I like to skip support up to around 80 degrees (where 90 degrees is a horizontal surface).  So that's a setting in cura you can mess with and see what happens in PREVIEW mode.

 

There are fancier features like "support blocker" where you can click on areas of the model where you don't want support.

 

As was mentioned above, if you do a single nozzle print, you have to remove the support later and it scars the surface.  It's this ugliness that people tend to hate about support.  With dissolvable support you can have perfect looking overhangs.

 

95% of my prints don't need support.  I design my own parts so I can usually think of a way to avoid support.  Also you don't need support for "bridging".  Think of printing the wall of a house with a doorway.  The top of that doorway doesn't need support (cura thinks it does, but it doesn't).  Because it can print the layer at the top of the door opening by stringing filament straight over the opening.  This doesn't work if the door isn't square and has a crooked top.  I'm sure you don't understand my previous sentence - you need to just start printing things and learn and then this makes more sense.

 

Here's a guide that is more visual, less words, and will help you understand and it's extremely easy and quick reading (spend like 10 minutes!) - skip down to the part that says "create a span" and now my above paragraph makes more sense:

http://support.3dverkstan.se/article/38-designing-for-3d-printing

 

These other 2 guides are also worth reading some day

http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide
http://support.3dverkstan.se/article/30-getting-better-prints

[Ayman1612 0]

Do you have a page or something else that explains each part of a 3D printer and what its role is like the motor belts, how the head of the printer moves, such an explanation page. As if knowing each part of its role

[Enigma_M4 98]

For first orientation, you could try this:

https://support.ultimaker.com/hc/en-us/articles/360013053880-Ultimaker-3-PDF-manuals

the site also contains a lot of information and possibly is exactly what you're looking for.