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somewhat URGENT - Support inner cavities

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Sorry for the URGENT tag, but I'd need to print this birthday present and I am running out of time :)

Here is the object in question:


I'd like to print the model without infill, but there is a big inner cavity that would be printed without anything beneath it. What to do? Printing with infill increases the printing time and I'd like to avoid it. Thanks!

Here is an animated gif (click on the thumbnail to play):

animate you must

(by the way, I used "licecap" to create an animated gif from a portion of my screen)



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My thinking was to stop the cylinder just shy of the surface of the hole so that you basically get a ring formed support for the bottom part of the hole to build from. You could branch out more cylinders at an angle higher up if you need more support.

edit: Dammit, you replied while I was deleting that comment :p


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