# Subtracting .STL

**URL:** https://discourse.shapr3d.com/t/subtracting-stl/39634
**Category:** Modeling Questions
**Created:** [October 19, 2025, 3:10pm UTC](https://discourse.shapr3d.com/t/subtracting-stl/39634 "2025-10-19T15:10:02Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![CYGNUSSPHERE](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/cygnussphere/32/23845_2.png) [@CYGNUSSPHERE](https://discourse.shapr3d.com/u/CYGNUSSPHERE)
#### Post date: [October 19, 2025, 3:10pm UTC](https://discourse.shapr3d.com/t/subtracting-stl/39634/1 "2025-10-19T15:10:02Z")

</div>

In the past I thought I had used the subtract function to subtract a .stl file from a object I created in the same project and I was able to edit the resulting object like a normal shapr object. I don’t seem to be able to do that now? In the example the bottom box is the stl file and the top is the result from subtracting the stl from a cube I drew and extruded in the same project. Before the subtract function I’m able to edit the cube normally after the subtract I can’t.

How can I do this?

 ![Example](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/f/e/fe38440d0d8f5a99964cd15012de007211fe9b29.jpeg)