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How do I define the size of an object?

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How do I define the size of an object? [message #40626] Thu, 22 December 2011 05:39 UTC Go to next message
avatar Sand3  is currently offline Sand3
Messages: 3
Registered: August 2011
Go to all my models
Junior Member
I'm working with Blender and I don't know how Blender units correspond to inches or cm. Is size something I'll define during the upload process here or is it something that I need to have somehow built into my model?
Re: How do I define the size of an object? [message #40758 is a reply to message #40626 ] Mon, 26 December 2011 16:58 UTC Go to previous messageGo to next message
avatar pongstak1  is currently offline pongstak1
Messages: 5
Registered: October 2011
Go to my shop
Junior Member
I use Sketchup instead of Blender. However, I imagine Blender might be able to export STL? If so, then you can use NetFabb to scale your STL to the right dimensions. Later, when you upload your STL to Shapeways, you can specify units (e.g., mm or inches). If Blender can't export STL, then you might need to export a format that Meshlab can change into STL. For example, Sketchup doesn't export STL, but it exports DAE, which I convert to STL using Meshlab. It's a quirky hodge-podge of tools to upload a 3D model, but, compared to the time to make the model itself, it's not a hassle.

Re: How do I define the size of an object? [message #40765 is a reply to message #40758 ] Mon, 26 December 2011 20:13 UTC Go to previous message
avatar Fredd  is currently offline Fredd
Messages: 350
Registered: November 2011
Go to all my models
Senior Member
A blender unit is subdivided into 10 units, which is good for metric sizes. There seems to be no problem using mm when you export to STL, as long as you consider a BU a 1mmx1mm sized area, and remember to rotate the model where its Y axis is aligned to the Z global axis.

Have any questions regarding Blender, and need fast answers, you are always welcome at the IRC Server Freenode, channel #blender. As a bonus, several there have experience in modelling for 3D prints.


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