Look mother, I made a ball.

3D Printing
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1

Look mother, I made a ball.

Tried making an 18cm round and empty ball as a test to see if it would print. It did but it became a bit wavy. Looks like a planet :slight_smile:

Printed on @Ultimaker with 0.4mm wall thickness in white PLA at 50mm/s, 0.09 layer thickness and 0% infill.

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Wow

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Looks completely intentional. :slight_smile:

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I’m trying to figure out how that could happen. Is it a single continuous spiral around the ball? It almost looks like massive Z wobble, but the Z screw would have to have about an 18mm lead for that to happen (Marlin source code suggests a 6mm lead, which is huge, but only about 1/3 what would be necessary to cause this). I’m thinking it must be the insufficient base area flexing and being dragged slightly by the nozzle (joris mode, right?) as it went in circles. As the base flexed, the side that was too high experienced more drag and the sphere was pushed in that direction, so the high point was in a slightly different point in the next layer, and so on. Amazing that it wasn’t enough to make the print fail completely…

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Yes, I think it dragging. It was flexing quite a lot while printing! Also my fan cover drags a bit when the print gets pushed by the head.

Ps. What is joris mode??? :slight_smile:

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It’s a setting in Cura (doesn’t seem to be implemented in their new slicing engine…) that breaks up the Z move throughout the outer perimeter rather than doing it all at once and making a seam. Slic3r recently implemented this feature too, with the more descriptive name “spiral vase”.

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The joris mode sounds exactly like what I need.

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Be careful with the spiral vase mode. Keep an eye on your z motor temp. In my firmware I have the z motor shut off when not in use since my z current is cranked up pretty high to avoid shipping steps (mechanical issues with my z design). I tried spiral vase and had to kill the print when my motor and step stick got blazing hot. I’ve gathered you have an ultimaker, so you’ll probably be fine, but doesn’t hurt to keep an eye on

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Thanks for the warning @Eric_Moy

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@Eric_Moy it’s not really uncommon for a stepper driver to get so hot that it can burn you. 75-80C isn’t uncommon.

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I put heat sinks on my Ultimaker steppers. Not sure if it’s really needed, but makes me feel better :slight_smile:

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I think you can get rid of the waves (allthough i like them) by printing more support material at the base.

Because the object walls are so thin. They slightly bend when the extruder passes.

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I did print it with brim and to be honest I think you need a lot of support material to get it to stay still. Perhaps I should try to print this in Flex PLA instead :slight_smile:

Looking at it now, I sort of like the waves :slight_smile: Looks like it is on purpose as somebody here wrote.

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@Peter_Parnes I thought the waves need to be there for the design!

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Yeah, I’d cut the bottom of and use it as an LED lamp shade, I bet it would look great as such

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By the way, here is the STL if anybody want to give it a try. http://www.thingiverse.com/thing:131433