# PreForm crashes when opening STL files **URL:** \ **Category:** Support & Troubleshooting\ **Created:** [September 11, 2017, 10:20am UTC](https://forum.formlabs.com/t/preform-crashes-when-opening-stl-files/14902 "2017-09-11T10:20:44Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Turbolego](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/turbolego/32/10604_2.png) [@Turbolego](https://forum.formlabs.com/u/Turbolego)\ **Post date:** [September 11, 2017, 10:20am UTC](https://forum.formlabs.com/t/preform-crashes-when-opening-stl-files/14902/1 "2017-09-11T10:20:44Z")
Hi! I’m trying to open STL files in PreForm. It crashes around 60% (see picture). I have 16GB of RAM and an i7 processor. PreForm uses 2GB of ram before it crashes. I’m using Windows 10 pro with the latest updates. MeshLab can open the STL just fine. Please advice. ![Screenshot_414](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/9/908563b4d9dba3c0bd3d456f79ca2a3489d79c18.png) ---
**Author:** ![Komy](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/komy/32/10068_2.png) [@Komy](https://forum.formlabs.com/u/Komy)\ **Post date:** [September 11, 2017, 3:24pm UTC](https://forum.formlabs.com/t/preform-crashes-when-opening-stl-files/14902/2 "2017-09-11T15:24:56Z")
preform is 32 bit as I can see, you can use proboably 2GB of RAM although you have 16GB. Try using WIN 64x or easy way is to open your stl file in some 3D modeling program and optimize polygon count (less polygons), you have probably too much polygons on your model and not “enough” memory. ---
**Author:** ![Turbolego](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/turbolego/32/10604_2.png) [@Turbolego](https://forum.formlabs.com/u/Turbolego)\ **Post date:** [September 11, 2017, 3:35pm UTC](https://forum.formlabs.com/t/preform-crashes-when-opening-stl-files/14902/3 "2017-09-11T15:35:48Z")
I’m running Windows Version 10.0.15063 Build 15063 Pro, 64-bit, I’ll try messing with the .stl in meshmixer and see if that helps (as suggested by Robert Koch in my support ticket). I’ll keep this post updated with my results. ---
**Author:** ![Zachary\_Brackin](https://avatars.discourse-cdn.com/v4/letter/z/4da419/32.png) [@Zachary\_Brackin](https://forum.formlabs.com/u/Zachary_Brackin)\ **Post date:** [September 11, 2017, 4:18pm UTC](https://forum.formlabs.com/t/preform-crashes-when-opening-stl-files/14902/4 "2017-09-11T16:18:54Z")
How big is the file you’re trying to load? ---
**Author:** ![Turbolego](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/turbolego/32/10604_2.png) [@Turbolego](https://forum.formlabs.com/u/Turbolego)\ **Post date:** [September 11, 2017, 4:25pm UTC](https://forum.formlabs.com/t/preform-crashes-when-opening-stl-files/14902/5 "2017-09-11T16:25:07Z")
335MB, 6.8 million triangles ---
**Author:** ![Komy](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/komy/32/10068_2.png) [@Komy](https://forum.formlabs.com/u/Komy)\ **Post date:** [September 12, 2017, 6:45am UTC](https://forum.formlabs.com/t/preform-crashes-when-opening-stl-files/14902/6 "2017-09-12T06:45:37Z")
try to reduce that file ---
**Author:** ![Zachary\_Brackin](https://avatars.discourse-cdn.com/v4/letter/z/4da419/32.png) [@Zachary\_Brackin](https://forum.formlabs.com/u/Zachary_Brackin)\ **Post date:** [September 12, 2017, 3:37pm UTC](https://forum.formlabs.com/t/preform-crashes-when-opening-stl-files/14902/7 "2017-09-12T15:37:49Z")
Yeah, that’s a lot, you might not actually need that much. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/b/5bc2bdf993ff27c2e0eecab5010b25626fbb327a.png) [@system](https://forum.formlabs.com/u/system)\ **Post date:** [September 26, 2017, 3:37pm UTC](https://forum.formlabs.com/t/preform-crashes-when-opening-stl-files/14902/8 "2017-09-26T15:37:53Z")
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