Incorrect height of print

[futrtrubl]

Doing an Elephant's Foot Calibration. 0.02mm layers, 6 bottom layers, 119 normal layers, should produce a print of total height 2.5mm. The Calibration dialogue agrees 2.5 mm, as does the main interface with the sliced file. However when printed I get 1.84mm using digital calipers. I'm going to try troubleshoot the printer to see if it at fault somehow. But I was wondering if there might be something within UVtools that could have caused this, like setting Intrude text instead of extrude. Attached is the sliced file.
any bas cle 20um elephants foot calibration.zip

System

Operative system: Microsoft Windows 10.0.19043 X64
Processor: AMD Ryzen 5 3600X 6-Core Processor             
Processor cores: 12
Memory RAM: 17.71 / 31.92 GB
Runtime: win10-x64
Framework: .NET 5.0.12
AvaloniaUI: 0.10.8
OpenCV: 4.5.4-235

Sreens, resolution, working area, usable area:
1: 2560 x 1440 @ 125% (Primary) (On this)
    WA: 2560 x 1339    UA: 2048 x 1071
2: 1920 x 1080 @ 125%
    WA: 1920 x 1030    UA: 1536 x 824

Path: C:\Program Files\UVtools

General configuration for OpenCV 4.5.4 =====================================
  Version control:               4.5.4-235-g27567928d7

  Extra modules:
    Location (extra):            D:/bb/cv_x64/build/build_x64/../opencv_contrib/modules
    Version control (extra):     4.5.4-61-gc33e5b60

  Platform:
    Timestamp:                   2021-10-27T09:08:07Z
    Host:                        Windows 10.0.22000 AMD64
    CMake:                       3.21.3
    CMake generator:             Visual Studio 16 2019
    CMake build tool:            C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/MSBuild/Current/Bin/MSBuild.exe
    MSVC:                        1929
    Configuration:               Debug Release MinSizeRel RelWithDebInfo

  CPU/HW features:
    Baseline:                    SSE SSE2 SSE3
      requested:                 SSE3

  C/C++:
    Built as dynamic libs?:      NO
    C++ standard:                11
    C++ Compiler:                C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30133/bin/Hostx64/x64/cl.exe  (ver 19.29.30136.0)
    C++ flags (Release):         /DWIN32 /D_WINDOWS /W4 /GR  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /MP  /MD /O2 /Ob2 /DNDEBUG 
    C++ flags (Debug):           /DWIN32 /D_WINDOWS /W4 /GR  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /MP  /MDd /Zi /Ob0 /Od /RTC1 
    C Compiler:                  C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30133/bin/Hostx64/x64/cl.exe
    C flags (Release):           /DWIN32 /D_WINDOWS /W3  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /MP   /MD /O2 /Ob2 /DNDEBUG 
    C flags (Debug):             /DWIN32 /D_W
[any bas cle 20um elephants foot calibration.zip](https://github.com/sn4k3/UVtools/files/7655057/any.bas.cle.20um.elephants.foot.calibration.zip)
INDOWS /W3  /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi  /fp:precise     /MP /MDd /Zi /Ob0 /Od /RTC1 
    Linker flags (Release):      /machine:x64  /INCREMENTAL:NO 
    Linker flags (Debug):        /machine:x64  /debug /INCREMENTAL 
    ccache:                      NO
    Precompiled headers:         YES
    Extra dependencies:          wsock32 comctl32 gdi32 ole32 setupapi ws2_32 D:/bb/cv_x64/build/build_x64/install/lib/freetype.lib D:/bb/cv_x64/build/build_x64/install/lib/harfbuzz.lib D:/bb/cv_x64/build/build_x64/install/lib/libhdf5.lib vtkRenderingOpenGL2 vtkCommonCore vtksys vtkCommonDataModel vtkCommonMath vtkCommonMisc vtkCommonSystem vtkCommonTransforms vtkCommonExecutionModel vtkRenderingCore vtkCommonColor vtkCommonComputationalGeometry vtkFiltersCore vtkFiltersGeneral vtkFiltersGeometry vtkFiltersSources vtkglew vtkInteractionStyle vtkFiltersExtraction vtkFiltersStatistics vtkImagingFourier vtkImagingCore vtkRenderingLOD vtkFiltersModeling vtkIOPLY vtkIOCore vtkdoubleconversion vtklz4 vtklzma vtkzlib vtkFiltersTexture vtkRenderingFreeType vtkfreetype vtkIOExport vtkIOImage vtkDICOMParser vtkmetaio vtkjpeg vtkpng vtktiff vtkIOXML vtkIOXMLParser vtkexpat vtkRenderingContext2D vtkRenderingGL2PSOpenGL2 vtkgl2ps vtkIOGeometry vtkIOLegacy
    3rdparty dependencies:       libprotobuf ade ittnotify libjpeg-turbo libwebp libpng libtiff libopenjp2 IlmImf zlib quirc

  OpenCV modules:
    To be built:                 alphamat aruco barcode bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dnn_superres dpm face features2d flann freetype fuzzy gapi hdf hfs highgui img_hash imgcodecs imgproc intensity_transform line_descriptor mcc ml objdetect optflow phase_unwrapping photo plot quality rapid reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab viz wechat_qrcode xfeatures2d ximgproc xobjdetect xphoto
    Disabled:                    python_bindings_generator python_tests world
    Disabled by dependency:      -
    Unavailable:                 cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv java julia matlab ovis python2 python3 sfm
    Applications:                perf_tests
    Documentation:               NO
    Non-free algorithms:         NO

  Windows RT support:            NO

  GUI:                           WIN32UI
    Win32 UI:                    YES
    VTK support:                 YES (ver 8.2.0)

  Media I/O: 
    ZLib:                        build (ver 1.2.11)
    JPEG:                        build-libjpeg-turbo (ver 2.1.0-62)
    WEBP:                        build (ver encoder: 0x020f)
    PNG:                         build (ver 1.6.37)
    TIFF:                        build (ver 42 - 4.2.0)
    JPEG 2000:                   build (ver 2.4.0)
    OpenEXR:                     build (ver 2.3.0)
    HDR:                         YES
    SUNRASTER:                   YES
    PXM:                         YES
    PFM:                         YES

  Video I/O:
    DC1394:                      NO
    FFMPEG:                      YES (prebuilt binaries)
      avcodec:                   YES (58.134.100)
      avformat:                  YES (58.76.100)
      avutil:                    YES (56.70.100)
      swscale:                   YES (5.9.100)
      avresample:                YES (4.0.0)
    GStreamer:                   NO
    DirectShow:                  YES
    Media Foundation:            YES
      DXVA:                      YES

  Parallel framework:            Concurrency

  Trace:                         YES (with Intel ITT)

  Other third-party libraries:
    Eigen:                       YES (ver 3.3.7)
    Custom HAL:                  NO
    Protobuf:                    build (3.5.1)

  OpenCL:                        YES (NVD3D11)
    Include path:                D:/bb/cv_x64/build/opencv/3rdparty/include/opencl/1.2
    Link libraries:              Dynamic load

  Python (for build):            C:/python-virt/python37/python.exe

  Java:                          
    ant:                         NO
    JNI:                         C:/Program Files/Java/jdk1.8.0_202/include C:/Program Files/Java/jdk1.8.0_202/include/win32 C:/Program Files/Java/jdk1.8.0_202/include
    Java wrappers:               NO
    Java tests:                  NO

  Install to:                    D:/bb/cv_x64/build/build_x64/install
-----------------------------------------------------------------


Loaded Assemblies:
001: System.Private.CoreLib, Version=5.0.0.0
002: UVtools, Version=2.25.3.0
003: System.Runtime, Version=5.0.0.0
004: Avalonia.DesktopRuntime, Version=0.10.8.0
005: Avalonia.Controls, Version=0.10.8.0
006: netstandard, Version=2.1.0.0
007: Avalonia.Base, Version=0.10.8.0
008: System.ObjectModel, Version=5.0.0.0
009: Avalonia.Styling, Version=0.10.8.0
010: Avalonia.Input, Version=0.10.8.0
011: Avalonia.Interactivity, Version=0.10.8.0
012: Avalonia.Layout, Version=0.10.8.0
013: Avalonia.Visuals, Version=0.10.8.0
014: Avalonia.Animation, Version=0.10.8.0
015: System.ComponentModel.Primitives, Version=5.0.0.0
016: System.Collections, Version=5.0.0.0
017: System.Console, Version=5.0.0.0
018: UVtools.Core, Version=2.25.3.0
019: System.Drawing.Primitives, Version=5.0.0.0
020: System.IO.FileSystem, Version=5.0.0.0
021: MoreLinq, Version=3.3.2.0
022: System.Data.Common, Version=5.0.0.0
023: System.ComponentModel.TypeConverter, Version=5.0.0.0
024: System.ComponentModel, Version=5.0.0.0
025: System.Xml.ReaderWriter, Version=5.0.0.0
026: System.Private.Xml, Version=5.0.0.0
027: System.Numerics.Vectors, Version=5.0.0.0
028: Avalonia.Desktop, Version=0.10.8.0
029: Avalonia.Win32, Version=0.10.8.0
030: Avalonia.MicroCom, Version=0.10.8.0
031: System.Runtime.InteropServices, Version=5.0.0.0
032: System.Collections.Concurrent, Version=5.0.0.0
033: Avalonia.X11, Version=0.10.8.0
034: Avalonia.Native, Version=0.10.8.0
035: Avalonia.Skia, Version=0.10.8.0
036: System.Runtime.InteropServices.RuntimeInformation, Version=5.0.0.0
037: Avalonia.OpenGL, Version=0.10.8.0
038: System.Reactive, Version=5.0.0.0
039: System.Threading, Version=5.0.0.0
040: System.Private.Uri, Version=5.0.0.0
041: System.Linq, Version=5.0.0.0
042: System.Runtime.Extensions, Version=5.0.0.0
043: System.Xml.XDocument, Version=5.0.0.0
044: System.Private.Xml.Linq, Version=5.0.0.0
045: System.Threading.Thread, Version=5.0.0.0
046: System.Memory, Version=5.0.0.0
047: System.Security.Cryptography.Algorithms, Version=5.0.0.0
048: System.Text.Encoding.Extensions, Version=5.0.0.0
049: Microsoft.Win32.Primitives, Version=5.0.0.0
050: SkiaSharp, Version=2.80.0.0
051: System.Diagnostics.TraceSource, Version=5.0.0.0
052: System.Diagnostics.StackTrace, Version=5.0.0.0
053: System.Reflection.Metadata, Version=5.0.0.0
054: System.Collections.Immutable, Version=5.0.0.0
055: System.IO.Compression, Version=5.0.0.0
056: System.IO.MemoryMappedFiles, Version=5.0.0.0
057: System.Threading.Timer, Version=5.0.0.0
058: Avalonia.Markup.Xaml, Version=0.10.8.0
059: Avalonia.Themes.Fluent, Version=0.10.8.0
060: Avalonia.Markup, Version=0.10.8.0
061: System.Runtime.CompilerServices.Unsafe, Version=5.0.0.0
062: ThemeEditor.Controls.ColorPicker, Version=0.10.8.0
063: Avalonia.Controls.DataGrid, Version=0.10.8.0
064: Emgu.CV.Platform.NetStandard, Version=4.5.4.4788
065: MessageBox.Avalonia, Version=1.0.0.0
066: System.Xml.XmlSerializer, Version=5.0.0.0
067: System.Collections.NonGeneric, Version=5.0.0.0
068: System.Text.RegularExpressions, Version=5.0.0.0
069: System.Reflection.Emit.ILGeneration, Version=5.0.0.0
070: System.Reflection.Emit, Version=5.0.0.0
071: Microsoft.GeneratedCode, Version=1.0.0.0
072: System.Reflection.Primitives, Version=5.0.0.0
073: UVtools.AvaloniaControls, Version=1.0.1.0
074: System.Drawing.Common, Version=4.0.0.0
075: System.Linq.Expressions, Version=5.0.0.0
076: System.ComponentModel.Annotations, Version=5.0.0.0
077: System.Reflection.Emit.Lightweight, Version=5.0.0.0
078: Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0
079: System.Buffers, Version=5.0.0.0
080: HarfBuzzSharp, Version=1.0.0.0
081: System.Net.Http, Version=5.0.0.0
082: Newtonsoft.Json, Version=13.0.0.0
083: BinarySerializer, Version=8.6.1.2
084: System.Net.Primitives, Version=5.0.0.0
085: System.Threading.Tasks, Version=5.0.0.0
086: System.Diagnostics.Tracing, Version=5.0.0.0
087: System.Text.Encoding, Version=5.0.0.0
088: System.Diagnostics.DiagnosticSource, Version=5.0.0.0
089: System.Net.Security, Version=5.0.0.0
090: System.IO, Version=5.0.0.0
091: System.Security.Cryptography.X509Certificates, Version=5.0.0.0
092: System.Reflection.TypeExtensions, Version=5.0.0.0
093: System.Reflection, Version=5.0.0.0
094: System.Reflection.Extensions, Version=5.0.0.0
095: System.Net.Sockets, Version=5.0.0.0
096: System.Net.NameResolution, Version=5.0.0.0
097: System.IO.Compression.ZipFile, Version=5.0.0.0
098: System.Collections.Specialized, Version=5.0.0.0
099: System.Threading.Tasks.Parallel, Version=5.0.0.0
100: System.Security.Cryptography.Primitives, Version=5.0.0.0
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104: System.Security.Cryptography.Encoding, Version=5.0.0.0
105: System.Runtime.Numerics, Version=5.0.0.0
106: System.Runtime.Serialization.Formatters, Version=5.0.0.0
107: System.IO.FileSystem.DriveInfo, Version=5.0.0.0
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109: Microsoft.Win32.Registry, Version=6.0.0.0

[sn4k3]

Nothing wrong with the file, it is made to 2.5mm total. Layer 124 = PositionZ 2.500mm

I don't recommend 0.02mm nor 0.00x increments. Mimimum layer height of 0.03mm is safer in every way.
But is not odd to have a small size difference.

Repeat the test with 0.05mm and see, some printers can lose tiny fractions of position at each lift, depends on overall quality.

[X3msnake]

most likely your plate zero is not set at the propper height.

[futrtrubl]

Thank you all, X#msnake is correct the plate zero was not correct, I had added a magnetic flex plate but the spacer was not enough and the "squishiness" in the magnet made the force applied feel different for the correct zeroing.
As to z height accuracy with smaller layer heights I've found the Mars 2 to be very very consistent. I'm now doing some tests to see how repeatable it's limit sensing is.