Jump to content
Ultimaker Community of 3D Printing Experts

Any improvements on the default Raft settings?


TomniSells
 Share

Recommended Posts

Posted · Any improvements on the default Raft settings?

So I've never done a raft before. I don't know if people have improved and experimented with better raft tweaks, or if I should keep everything default as-is. I would appreciate any niche knowledge that I should know about before giving it a go.

  • Link to post
    Share on other sites

    Posted (edited) · Any improvements on the default Raft settings?

    I don't use raft very much.  If I notice a model that may lift (long thin features on the build plate) I typically use "mouse ears" to help adhesion (usually with PETG).  That being said, a raft is just a bunch of heavy extrusions with a model starting on top.  The distance between the top of the raft and the initial layer of the model has a large effect on both Surface Quality of the model bottom, and the release of the raft from the model without tearing up the model.  "Raft Air Gap" and "Initial Layer Z Overlap" have the biggest effect on those.

     

    I sliced a model and used a raft with the default raft settings.  Layer Height = 0.2, Raft Air Gap = 0.3, Initial Layer Z Overlap = 0.15.  The first layer of a raft is a negative number and in this example is "Layer:-6".  The bottom of the model is always Layer:0 in the Gcode.  You'll notice this does not match up with layer numbering in the Cura preview which always starts at "1".

    Z0.24   (.24) ;Layer:-6

    Z0.54   (.30) ;Layer:-5

    Z0.74   (.30) ;Layer:-4

    Z0.94   (.20) ;Layer:-3 Top layer of the raft

    Z1.44   (.50)   ;Layer:0 - The first layer of the model @ [Air Gap + Layer Height] above the raft

    Z1.49   (0.05) ;Layer:1 @ [Layer Height - Initial Layer Z Overlap] above Layer:0.

    Z1.69   (0.20) ;Layer:2 starts using the actual Layer Height

    Edited by GregValiant
  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
     Share

    • Our picks

      • The Ultimaker Showcase — October 14. What's new?
        Your dear friends at Ultimaker have some exciting news and insights for you!
         
        • 0 replies
      • New here? Get ahead with a free onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 8 replies
    ×
    ×
    • Create New...