# Fixing the BoundaryEdges issue of an Errored STL

**URL:** https://discourse.vtk.org/t/fixing-the-boundaryedges-issue-of-an-errored-stl/12889
**Category:** Support
**Created:** [December 13, 2023, 6:56am UTC](https://discourse.vtk.org/t/fixing-the-boundaryedges-issue-of-an-errored-stl/12889 "2023-12-13T06:56:03Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Anvesh](https://discourse.vtk.org/user_avatar/discourse.vtk.org/anvesh/32/10590_2.png) [@Anvesh](https://discourse.vtk.org/u/Anvesh)
#### Post date: [December 13, 2023, 6:56am UTC](https://discourse.vtk.org/t/fixing-the-boundaryedges-issue-of-an-errored-stl/12889/1 "2023-12-13T06:56:03Z")

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Hello there,

I tried to correct the errored stl file using the vtk Classes… But got stuck at the below explained problem,

**Problem**  
I have a stl file which is shown below:  
 ![1](https://discourse.vtk.org/uploads/default/original/2X/6/657216f55e64ce0515db96131ff437869d388718.jpeg)

For this, I have to close the region that is in between the two cylinder on both the top surface and the bottom surface.  
I tried using the _ **vtkFillHoleFilter** _ but, the whole top and bottom surfaces are getting closed.  
I need to close only the ring shape, which is in-between the two cylinders.

Please, help me out in achieving this, not only for this part but also for any generalized part, by providing the _suitable vtkClasses_ or the _sequence of different vtkClasses_, that can be helpful.

Thanks!