# Is shapr3D now off when creating an STL?

**URL:** <https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121>\
**Category:** Modeling Questions\
**Created:** [July 1, 2022, 2:00pm UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121 "2022-07-01T14:00:51Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![mikenbrenda](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mikenbrenda/32/6386_2.png) [@mikenbrenda](https://discourse.shapr3d.com/u/mikenbrenda)\
**Post date:** [July 1, 2022, 2:00pm UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121/1 "2022-07-01T14:00:51Z")

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I have been using shapr3D for months now and aways was right on, i did the upgrades and now i printed a piece and the inside diameter was suppose to be 69.2mm and it is 68.60, and it never was off before…

I am just curious if anyone else knew of any problems recently… it is strange that it is off that much and it is not the printer as i checked with with another stl file… I had before.

So I am enlarging the circumference and will print to see what i get this time…

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**Author:** ![McD](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mcd/32/15504_2.png) [@McD](https://discourse.shapr3d.com/u/McD)\
**Post date:** [July 1, 2022, 3:16pm UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121/2 "2022-07-01T15:16:06Z")

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I haven’t ever experienced this. I’ll try a print off the latest version, and advise.

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**Author:** ![mikenbrenda](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mikenbrenda/32/6386_2.png) [@mikenbrenda](https://discourse.shapr3d.com/u/mikenbrenda)\
**Post date:** [July 3, 2022, 2:05pm UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121/3 "2022-07-03T14:05:11Z")

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Did you find anything?

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**Author:** ![McD](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mcd/32/15504_2.png) [@McD](https://discourse.shapr3d.com/u/McD)\
**Post date:** [July 3, 2022, 3:57pm UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121/4 "2022-07-03T15:57:33Z")

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Sorry for the delay. I ran some parts. Round, square, holes, etc. All were correctly printed as drawn.

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**Author:** ![mikenbrenda](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mikenbrenda/32/6386_2.png) [@mikenbrenda](https://discourse.shapr3d.com/u/mikenbrenda)\
**Post date:** [July 3, 2022, 4:15pm UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121/5 "2022-07-03T16:15:47Z")

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I actually did not see my typo i meant to say it was layed out at 69.2 mm and i ended up with 68.60, something when i had to go to print on 70.2 it is now 69.66 it is exactly .6 mm smaller… when printed…

You need to measure with calipers, unless the plastic is causing the difference in shortage to something…

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**Author:** ![McD](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mcd/32/15504_2.png) [@McD](https://discourse.shapr3d.com/u/McD)\
**Post date:** [July 3, 2022, 4:53pm UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121/6 "2022-07-03T16:53:38Z")

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I’m using a Form3 resin printer. The parts I printed, measured using calipers and a micrometer, are precise, to within .0015 inches. The parts slip fit into each other as deigned. I am not seeing a scaling or dimensional error with version 5.162.0.3499 of Shapr3D.

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**Author:** ![mikenbrenda](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mikenbrenda/32/6386_2.png) [@mikenbrenda](https://discourse.shapr3d.com/u/mikenbrenda)\
**Post date:** [July 3, 2022, 5:40pm UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121/7 "2022-07-03T17:40:13Z")

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Windows, Mac, or iPad? I am on Mac version…im on Version 5.161.0 (3483)

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**Author:** ![McD](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mcd/32/15504_2.png) [@McD](https://discourse.shapr3d.com/u/McD)\
**Post date:** [July 3, 2022, 5:56pm UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121/8 "2022-07-03T17:56:17Z")

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iPad only.

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**Author:** ![KPeter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/kpeter/32/7644_2.png) [@KPeter](https://discourse.shapr3d.com/u/KPeter)\
**Post date:** [July 4, 2022, 7:26am UTC](https://discourse.shapr3d.com/t/is-shapr3d-now-off-when-creating-an-stl/20121/9 "2022-07-04T07:26:17Z")

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Hi @mikenbrenda!  
The accuracy of the STL file is independent of the platform you are using, it is defined by the tolerance settings of the export flow. Please feel free to check the exported STL file by reimporting it to Shapr3D and comparing it to the original file. As it is a mesh model, you will not be able to make exact measurements on it, but you’ll see the significant size differences.

We’ve seen a regular issue quite frequently when the part was made in imperial dimensions and the slicer expected metric units by default. In this case, the printed part was significantly (25.4x) bigger than the nominal dimension.

A .6 mm deviation from the nominal dimensions however looks like a regular inaccuracy of the printing technology. Resin printers like the Form 3 tend to be surprisingly accurate even with the default settings if the workpiece is oriented correctly, while FDM technology needs some more tweaking to match the nominal dimensions.