Jump to content
Sign in to follow this  
jweaver

Adding a Raft doen't add more layer

Recommended Posts

Posted · Adding a Raft doen't add more layer

I have been playing with Rafts and Brims and looking at the "layers" in Cura rather than printing for real.

And I am confused.. If I start with a model which has 99 lines.. And then I add a raft of 3 lines.. You can see that the first layer of the model now gets pushed up to layer 4.

But the model is still 99 lines tall, so the top gets cropped off.

This can easily be seen by exagerating the number of layers, to say 50... And then looking at the "layer" view.. The model is now sat on a thick raft, but the top is now missing.

What gives? Is this right?

Jon

 

Share this post


Link to post
Share on other sites
Posted · Adding a Raft doen't add more layer

It's probably just not displaying the top - I'm guessing it still creates the gcode. You can test this by opening the gcode file in repetier host which has a better "layer view" than cura does and it's free.

I've never used raft feature by the way. It's kind of an old technology that isn't needed so much anymore as there are now other techniques.

 

Share this post


Link to post
Share on other sites
Posted · Adding a Raft doen't add more layer
It's probably just not displaying the top - I'm guessing it still creates the gcode. You can test this by opening the gcode file in repetier host which has a better "layer view" than cura does and it's free.

 

I've never used raft feature by the way. It's kind of an old technology that isn't needed so much anymore as there are now other techniques.

 

Cheers.. I was just playing about, trying to work things out.. What othrr techniques are there?

I had to do a couple of prints tonigh with small areas of contact.. One fell over (one the last layer) and one moved during the print...

I looked at Brim, but this would be added to the bottom of my print, so i felt a "raft" was the better option... What else is there?

Share this post


Link to post
Share on other sites
Posted · Adding a Raft doen't add more layer

Does your printrbot have a heated bed? What is your bed like? aluminum? acrylic? glass? Are you printing PLA or ABS?

 

Share this post


Link to post
Share on other sites
Posted · Adding a Raft doen't add more layer

I am ruinning PLA onto blue tape over aluminium (non-heated)

I don't have a problem getting the first layer to stick.. But this project has 2 shafts.. And I have scaled the whole thing down to print a small version..

The shafts are about 6mm which means that there is almost no surface area.

I have managed to print the 3 that I need with no problems (although the first fell over on the last layer)..

But I was just wondering whether Brim/Raft might help me in cases like this.

Jon

 

Share this post


Link to post
Share on other sites
Posted · Adding a Raft doen't add more layer

100% sure the layers will be in the GCode. As the raft is seen as negative layers in the engine code.

So most likely this is a problem of the GUI not showing the layers because it miscalculated the layer count.

However, a brim is usually a better option then a raft. It uses less plastic, less print time, sticks better on small prints and leaves no surface scars.

 

Share this post


Link to post
Share on other sites
Posted · Adding a Raft doen't add more layer

100% sure the layers will be in the GCode. As the raft is seen as negative layers in the engine code.

So most likely this is a problem of the GUI not showing the layers because it miscalculated the layer count.

However, a brim is usually a better option then a raft. It uses less plastic, less print time, sticks better on small prints and leaves no surface scars.

 

Cheers.. Will try a brim.. My only fear was that it extended outwards from the bottom layer, so I assume would be visible.. Where as the 'raft' implied that it was a totally seperate structure which could be removed.

It doens't really matter too much.. I will give a Brim a look to see how it turns out.

Cheers

Jon

 

Share this post


Link to post
Share on other sites
Posted · Adding a Raft doen't add more layer

Brim is easy to remove afterwards. It's a fantastic feature and I use it on 80% of my prints. It helps parts stick to the surface - especially if they have sharp (square) corners.

Make sure you clean your blue tape with isopropyl alcohol. Blue painters tape comes with a waxy substance that keeps the tape from sticking to itself. isopropyl alcohol (just put it on a tissue or cotton and wipe for a few seconds) removes that. Other solvents might also work - not sure. But rubbing alcohol works great. Found anywhere bandages are sold:

isopropyl alcohol (bottom shelf)

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Our picks

    • Ultimaker Cura 4.0 | Stable available!
      Ultimaker Cura 4.0 is mainly focused on the improved user interface and cloud integration.
      As always, we want to collect your user feedback for this release. If there are any improvements you can think of, feel free to mention it here and help us to shape the next release.
      • 87 replies
×
×
  • Create New...

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!