Measurements

[Mike Jones]

What form of measurement does 3DTin use? is it inches? I exported an STL file that I though would be 6 inches long and it is tiny.

[Jayesh Salvi]

Hi Mike,

You can find a detailed answer to your question in my earlier reply on this group

https://groups.google.com/forum/#!topic/3dtin/eWBETu0tp7M

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Jayesh
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On Mon, Dec 10, 2012 at 2:02 PM, Mike Jones <mj9...@gmail.com> wrote:

What form of measurement does 3DTin use? is it inches? I exported an STL file that I though would be 6 inches long and it is tiny.

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[Mike Jones]

Thanks for the answer. I don't know if you are into Pronterface/Slic3r but my design is 6 units long in 3D Tin and I am setting units to inches (G20) in the gcode file. However the print size is still very small.

Any ideas?

Just want to say I really like 3D Tin. Especially for it's browser based portability.

[Jayesh Salvi]

I had used Pronterface/Slic3r with 3DTin models a while before. I also had a lot of difficulty printing the model in real life units correctly. I went the trial-n-error route and after printing some sample models, I really got the knack of Slic3r's unit conversion.

I don't however think this problem can be solved only in 3DTin. If there was a way to specify the units in software and maintain them till the model reaches the actual printer. Unfortunately, that requires all the intermediate software to treat the unit data uniformly. That's not the case today. STL file format units have no well-defined relationship to real world physical units. The best we can hope for, is maintaining the proportionality of the model. Then you can use the scaling tools at any intermediate stage to get the right size print eventually.

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Jayesh
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[Mike Jones]

Is there any particular software you recommend for that. Preferably free or cheap.

On Monday, December 10, 2012 1:02:09 PM UTC-6, Mike Jones wrote:

[Jayesh Salvi]

Slic3r lets you scale the model, so you can use that feature. Also Makerbot's tool (previously called ReplicatorG) has easy to use scaling feature.

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[Bryce Lewis]

For some odd reason, exporting from 3DTin into Slic3r yields 1.5x the expected scale, so scaling it to 67% gets close.

I don't know why it would ever do this.