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Author Topic: Repetier Host/3D Model Problem  (Read 2694 times)

Cualer

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Repetier Host/3D Model Problem
« on: September 20, 2013, 08:04:12 PM »
 Hiya! I was in the lab last night and today trying to print a part, but I'm running into a problem. I used Inventor Pro 2013 to build the part (metric/mm) and exported/saved a copy as STL. Whenever I try to load the part into Repetier host, the part shown in the preview is tiny in comparison to the print bed. I can't find where I'm running awry in my process...

I've attached the STL and IPT file for the part in question (in a zip file), along with a screen shot of the problem in repetier host. Could any of the almighty 3D printing masters guide me onto the proper path? :)

Matt

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Re: Repetier Host/3D Model Problem
« Reply #1 on: September 21, 2013, 02:52:44 PM »
it's likely just a difference in units. All of the 3d printing software we use expects the STL file to be in mm but in fact STL is a unitless format.  If you created your part in inches then you need to apply a scale of 25.4 to the part after importing (I'm not sure how to do this in Repetier host, but there is sure to be some way to apply a scale). If you used meters then you need to apply a scale of 1000...
-Matt

Cualer

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Re: Repetier Host/3D Model Problem
« Reply #2 on: September 21, 2013, 09:14:13 PM »

I initially made the part using imperial units (inches), and ran into that issue when I couldn't determine a way to switch the part to metric units, so I remade the entire part in a new file using metric units. But I still get the same issue, so I don't know whether Inventor is exporting it to STL incorrectly or repetier host is misreading the STL from inventor, but I've attempted to recreate the entire part using mm and haven't fixed the problem. Pocky recommended scaling each axis by 25.4, which repetier is able to do, but the part is enlarged more than it should be.


I wasn't able to get by the lab today and won't be able to for the next couple weeks, but I'll try redesigning a small part in some open source CAD programs (FreeCAD/SketchUp), exporting to STL and determining whether or not it's Inventor or something else...


- Suraj

Cualer

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Re: Repetier Host/3D Model Problem
« Reply #3 on: October 02, 2013, 04:30:49 AM »
Hmm I think I've determined the issue (with the guidance of another Maker Lab/Fab Lab on my alma mater). Apparently, even though the .STL format is "unitless," one of the fellows at the Fab Lab informed me that the standard actually called for STL to be in centimeters, so a scaling factor of 10 is needed to convert from cm >> mm. I won't be able to confirm if this is the case until I get back into the Lab late this week, but hopefully it solves the issue..


- Suraj