# Printing wrong size

**URL:** <https://discourse.shapr3d.com/t/printing-wrong-size/6697>\
**Category:** Modeling Questions\
**Created:** [February 20, 2020, 2:53am UTC](https://discourse.shapr3d.com/t/printing-wrong-size/6697 "2020-02-20T02:53:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dragoon6](https://avatars.discourse-cdn.com/v4/letter/d/a88e4f/32.png) [@Dragoon6](https://discourse.shapr3d.com/u/Dragoon6)\
**Post date:** [February 20, 2020, 2:53am UTC](https://discourse.shapr3d.com/t/printing-wrong-size/6697/1 "2020-02-20T02:53:10Z")

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So the problem is that every time i make a 3D model and print it, the actual size value is not correct. As in making a 4mm circle it ends up coming out 6 to 7mm not sure what I’m doing wrong but can you point me in the right direction.

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**Author:** ![DanielR](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/danielr/32/582_2.png) [@DanielR](https://discourse.shapr3d.com/u/DanielR)\
**Post date:** [February 20, 2020, 11:03am UTC](https://discourse.shapr3d.com/t/printing-wrong-size/6697/2 "2020-02-20T11:03:52Z")

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Hello - are you making sure that both Shapr3D and the slicer is set for the same unit (e.g. both are in inches).

STL doesn’t contain unit information, so it can happen that a 4mm circle in Shapr3D becomes a 4 inch circle in a slicer.