3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: or [email protected]
There are CAD communities available at: [email protected] or [email protected]
Rules
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No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
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Be respectful, especially when disagreeing. Everyone should feel welcome here.
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No porn (NSFW prints are acceptable but must be marked NSFW)
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No Ads / Spamming / Guerrilla Marketing
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Do not create links to reddit
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If you see an issue please flag it
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No guns
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No injury gore posts
If you need an easy way to host pictures, https://catbox.moe/ may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is 
Moderation policy: Light, mostly invisible
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I would trust that your slicer is more correct than Blender, probably something is off with how you are measuring in Blender as it doesn't appear to be a scaling issue since one dimension is larger and the other smaller. I'm not too familiar with how Blender works below the hood, but I am pretty sure it isn't off by even 1%, but there is a good reason why CAD software kernels exist that use parametric equations (e.g. NURBS) to precisely represent dimension critical designs.
I don't think this is the case, but one potential issue to be aware of is that STL files are really just a faceted approximation of the true 3D data, depending on how it is exported the facets can introduce dimensional inaccuracy. So many people export their models with hilariously poor resolution that could result in dimensional discrepancies. But that is only the orders of a couple tenths of mm maximum, not what you are seeing here.