# Extrusion(subtract) delete away surfaces

**URL:** <https://discourse.shapr3d.com/t/extrusion-subtract-delete-away-surfaces/37782>\
**Category:** Modeling Questions\
**Created:** [May 3, 2025, 9:12am UTC](https://discourse.shapr3d.com/t/extrusion-subtract-delete-away-surfaces/37782 "2025-05-03T09:12:20Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![i-link](https://avatars.discourse-cdn.com/v4/letter/i/b38774/32.png) [@i-link](https://discourse.shapr3d.com/u/i-link)\
**Post date:** [May 3, 2025, 9:12am UTC](https://discourse.shapr3d.com/t/extrusion-subtract-delete-away-surfaces/37782/1 "2025-05-03T09:12:20Z")

</div>

I had been using Shapr3d for a few months, but recently I faced with a problem that I had never face before.

While extrude through a body with a sketch, some of the surfaces tends to get deleted off. I’m sure previously it never happen before.

It was a multiple surfaces extrusion, tested up to 72 surfaces with no issue but anything more, there’s weird error of surfaces gone missing on the main body.

 ![IMG_3062](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/f/e/fe51b33d2b9e1bfca2a481e17a76d46dfef9139b.jpeg)  
This is the body that I left editing, anything more to extrude, the surfaces will be missing

---

<div class="post-metadata">

**Author:** ![i-link](https://avatars.discourse-cdn.com/v4/letter/i/b38774/32.png) [@i-link](https://discourse.shapr3d.com/u/i-link)\
**Post date:** [May 3, 2025, 10:11am UTC](https://discourse.shapr3d.com/t/extrusion-subtract-delete-away-surfaces/37782/2 "2025-05-03T10:11:25Z")

</div>

![IMG_3064](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/2/a/2a62228652d4819e402c0a64fd6a175372da4e21.jpeg)