# Trouble subtracting

**URL:** https://discourse.shapr3d.com/t/trouble-subtracting/1364
**Category:** Modeling Questions
**Created:** [August 6, 2017, 2:24am UTC](https://discourse.shapr3d.com/t/trouble-subtracting/1364 "2017-08-06T02:24:21Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![Devvon](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/devvon/32/36586_2.png) [@Devvon](https://discourse.shapr3d.com/u/Devvon)
#### Post date: [August 6, 2017, 2:24am UTC](https://discourse.shapr3d.com/t/trouble-subtracting/1364/1 "2017-08-06T02:24:22Z")

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![IMG_1752](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/c/c2d517ce1314451709603295f6ff63ff57aa25ec.jpg)

I am trying to subtract the green semi circle from the red design, for some reason it doesn’t work, it simply subtracts the extension of green leaving the original line I created the curvature with.

Any ideas why this happening

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### Author: ![Devvon](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/devvon/32/36586_2.png) [@Devvon](https://discourse.shapr3d.com/u/Devvon)
#### Post date: [August 6, 2017, 2:28am UTC](https://discourse.shapr3d.com/t/trouble-subtracting/1364/2 "2017-08-06T02:28:38Z")

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![IMG_1754](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/1/1724c76124951809a0937e7bc51dfce61b2221fd.jpg)

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### Author: ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)
#### Post date: [August 6, 2017, 9:59am UTC](https://discourse.shapr3d.com/t/trouble-subtracting/1364/3 "2017-08-06T09:59:53Z")

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What happens if you just extrude it then use the subtract tool?

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### Author: ![Devvon](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/devvon/32/36586_2.png) [@Devvon](https://discourse.shapr3d.com/u/Devvon)
#### Post date: [August 6, 2017, 11:42am UTC](https://discourse.shapr3d.com/t/trouble-subtracting/1364/4 "2017-08-06T11:42:31Z")

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I finally got it working last night, it took me about two and half hours. I had to subtract 2mm peice by peice, and that was when the project didn’t freeze and crash every three attempts…

Got to say it was a nightmare.

I tried extrusion subtraction from the top which failed every time , I then thought about it and for the last picture which I drew the extruded design and extruded it length wise and subtracted. It failed each time till I used a 2mm and extruded it peice by peice.

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### Author: ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)
#### Post date: [August 6, 2017, 7:11pm UTC](https://discourse.shapr3d.com/t/trouble-subtracting/1364/5 "2017-08-06T19:11:21Z")

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With the next release this will be fixed.