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WISHLIST: Selective Hole Horizontal Expansion areas (are they possible?)


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Posted · WISHLIST: Selective Hole Horizontal Expansion areas (are they possible?)

The new Hole Horizontal Expansion option in Cura 4.8 is a great feature. However, currently the feature is applied to the entire print, so many non-holes areas that are technically 'a hole'  are affected as well (see the attached snippet). 

In the pic attached the centre shaft hole of the gear is too small (but the outside diameter of the gear is the correct size). So we apply Hole Horizontal Expansion to enlarge the diameter of the centre gear hole 0.6mm. 

The problem is the outside diameter of the gear is now 0.6mm smaller as the hole expansion has been applied to it as well. 

 

Would it be possible to tell cura where I want the Hole Horizontal Expansion applied?? Maybe by applying a mask like in the second attachment. So the shaft hole increases 0.3 but the outside diameter doesn't shrink 0.6mm?

 

Maybe this feature could be applied to a future version of Cura??

Snippet01.jpg

Snippet02.JPG

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    Posted · WISHLIST: Selective Hole Horizontal Expansion areas (are they possible?)

    This should already be possible using the Per Model Settings tool, see https://support.ultimaker.com/hc/en-us/articles/360012031399-How-to-adjust-print-settings-per-model-in-Ultimaker-Cura

     

    Load an additional model and overlap it with the main model (or create a support blocker as a shortcut). Then select the Per Model Settings tool (the one above the Support Blocker tool), and set the added model (or the support blocker) to "Modify settings for overlaps". Set the option for "Cutting Mesh", and then add the Hole Horizontal Expansion setting and adjust its value. Caveat: you will get additional walls.

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    Posted · WISHLIST: Selective Hole Horizontal Expansion areas (are they possible?)

    Hey thanks for the reply ahoeben!

     

    Yes in the simplest form your suggestion should work, but it is a lot of work and added printing time.  however due to the nature of the horizontal hole expansion basically working on every internal polygon of the part (which includes circles) I need to be able to select just the polygon to expand. 

     

    I have attached a picture to highlight what I mean. The attached is one piece and so in its current form the horizontal hole expansion will act on every polygon (marked with the white dots) because each complex shape is a polygon. 

     

    I still hope to be able to be selective in which polygon the expansion is applied to. This will overcome the inherent design floor in how these 3d printers work and why the holes are smaller in the first place. 

     

    Snippet03.jpg

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