ME
Mark Erbaugh
Sun, Feb 15, 2026 2:36 AM
Recently,
I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the program, it will crash with a segmentation fault.
I am running a M4 Pro Mac Mini with 48 GM of RAM running OSX 26.3 (Tahoe). I”m not running a lot of programs, so I don’t think I’m taxing the memory.
I’m running OpenScad 2026.02.13, but saw the same with the previous version.
I don’t know that it’s important, but the models I’ve was working on usually involve a Minkowski transform.
My normal workflow would be to create and export a .3mf file from OpenScad, import that file to Bambu Studio and print it. I’m away from the computer while the model is printing and when I return, OpenScad has crashed with the segmentation fault.
I’ve not experienced the segmentation fault while I’m actively editing the model in OpenScad.
Mark
Recently,
I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the program, it will crash with a segmentation fault.
I am running a M4 Pro Mac Mini with 48 GM of RAM running OSX 26.3 (Tahoe). I”m not running a lot of programs, so I don’t think I’m taxing the memory.
I’m running OpenScad 2026.02.13, but saw the same with the previous version.
I don’t know that it’s important, but the models I’ve was working on usually involve a Minkowski transform.
My normal workflow would be to create and export a .3mf file from OpenScad, import that file to Bambu Studio and print it. I’m away from the computer while the model is printing and when I return, OpenScad has crashed with the segmentation fault.
I’ve not experienced the segmentation fault while I’m actively editing the model in OpenScad.
Mark
LM
Leonard Martin Struttmann
Sun, Feb 15, 2026 3:23 AM
I'm still running Sequoia 15.7.3. I'll try to reproduce on OpenScad
2026.02.13
On Sat, Feb 14, 2026 at 8:36 PM Mark Erbaugh via Discuss <
discuss@lists.openscad.org> wrote:
Recently,
I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the
program, it will crash with a segmentation fault.
I am running a M4 Pro Mac Mini with 48 GM of RAM running OSX 26.3 (Tahoe).
I”m not running a lot of programs, so I don’t think I’m taxing the memory.
I’m running OpenScad 2026.02.13, but saw the same with the previous
version.
I don’t know that it’s important, but the models I’ve was working on
usually involve a Minkowski transform.
My normal workflow would be to create and export a .3mf file from
OpenScad, import that file to Bambu Studio and print it. I’m away from the
computer while the model is printing and when I return, OpenScad has
crashed with the segmentation fault.
I’ve not experienced the segmentation fault while I’m actively editing the
model in OpenScad.
Mark
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
I'm still running Sequoia 15.7.3. I'll try to reproduce on OpenScad
2026.02.13
On Sat, Feb 14, 2026 at 8:36 PM Mark Erbaugh via Discuss <
discuss@lists.openscad.org> wrote:
> Recently,
>
> I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the
> program, it will crash with a segmentation fault.
>
> I am running a M4 Pro Mac Mini with 48 GM of RAM running OSX 26.3 (Tahoe).
> I”m not running a lot of programs, so I don’t think I’m taxing the memory.
>
> I’m running OpenScad 2026.02.13, but saw the same with the previous
> version.
>
> I don’t know that it’s important, but the models I’ve was working on
> usually involve a Minkowski transform.
>
> My normal workflow would be to create and export a .3mf file from
> OpenScad, import that file to Bambu Studio and print it. I’m away from the
> computer while the model is printing and when I return, OpenScad has
> crashed with the segmentation fault.
>
> I’ve not experienced the segmentation fault while I’m actively editing the
> model in OpenScad.
>
> Mark
> _______________________________________________
> OpenSCAD mailing list
> To unsubscribe send an email to discuss-leave@lists.openscad.org
MK
Marius Kintel
Sun, Feb 15, 2026 4:53 AM
Are you able to extract a crash report from Console.app ?
On Feb 14, 2026, at 21:36, Mark Erbaugh via Discuss discuss@lists.openscad.org wrote:
Recently,
I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the program, it will crash with a segmentation fault.
I am running a M4 Pro Mac Mini with 48 GM of RAM running OSX 26.3 (Tahoe). I”m not running a lot of programs, so I don’t think I’m taxing the memory.
I’m running OpenScad 2026.02.13, but saw the same with the previous version.
I don’t know that it’s important, but the models I’ve was working on usually involve a Minkowski transform.
My normal workflow would be to create and export a .3mf file from OpenScad, import that file to Bambu Studio and print it. I’m away from the computer while the model is printing and when I return, OpenScad has crashed with the segmentation fault.
I’ve not experienced the segmentation fault while I’m actively editing the model in OpenScad.
Mark
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
Are you able to extract a crash report from Console.app ?
> On Feb 14, 2026, at 21:36, Mark Erbaugh via Discuss <discuss@lists.openscad.org> wrote:
>
> Recently,
>
> I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the program, it will crash with a segmentation fault.
>
> I am running a M4 Pro Mac Mini with 48 GM of RAM running OSX 26.3 (Tahoe). I”m not running a lot of programs, so I don’t think I’m taxing the memory.
>
> I’m running OpenScad 2026.02.13, but saw the same with the previous version.
>
> I don’t know that it’s important, but the models I’ve was working on usually involve a Minkowski transform.
>
> My normal workflow would be to create and export a .3mf file from OpenScad, import that file to Bambu Studio and print it. I’m away from the computer while the model is printing and when I return, OpenScad has crashed with the segmentation fault.
>
> I’ve not experienced the segmentation fault while I’m actively editing the model in OpenScad.
>
> Mark
> _______________________________________________
> OpenSCAD mailing list
> To unsubscribe send an email to discuss-leave@lists.openscad.org
ME
Mark Erbaugh
Sun, Feb 15, 2026 1:04 PM
I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the program, it will crash with a segmentation fault.
Attached is a crash report. There were 3 in my console. All were similar (segmentation fault).
Also, just as a check. I opened OpenScad and started with a new empty file and left it running overnight. No crash and is was still running in the morning.
Mark

>> I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the program, it will crash with a segmentation fault.
Attached is a crash report. There were 3 in my console. All were similar (segmentation fault).
Also, just as a check. I opened OpenScad and started with a new empty file and left it running overnight. No crash and is was still running in the morning.
Mark

CC
Cory Cross
Sun, Feb 15, 2026 3:28 PM
The following might help prove the problem:
defaults write org.openscad.OpenSCAD NSLayerPerformanceMode -int 1
It's supposed to prevent memory compression.
On the M4 Pro, macOS Tahoe uses a new "Dynamic Memory Compression" for background apps. When OpenSCAD is idle, Tahoe likely compresses or moves the memory associated with the OpenGL back-buffer. When the app performs a routine UI heartbeat (like blinking the cursor or checking for a file change), it attempts to move data to a "Front Buffer" that the OS has invalidated or relocated.
So please reproduce, then try the above command, then try again.
If I'm right, you'll want to render some or many really complicated shapes first to make it more likely to get compressed.
On February 15, 2026 5:04:35 AM PST, Mark Erbaugh via Discuss discuss@lists.openscad.org wrote:
I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the program, it will crash with a segmentation fault.
Attached is a crash report. There were 3 in my console. All were similar (segmentation fault).
Also, just as a check. I opened OpenScad and started with a new empty file and left it running overnight. No crash and is was still running in the morning.
Mark

The following might help prove the problem:
`defaults write org.openscad.OpenSCAD NSLayerPerformanceMode -int 1`
It's supposed to prevent memory compression.
On the M4 Pro, macOS Tahoe uses a new "Dynamic Memory Compression" for background apps. When OpenSCAD is idle, Tahoe likely compresses or moves the memory associated with the OpenGL back-buffer. When the app performs a routine UI heartbeat (like blinking the cursor or checking for a file change), it attempts to move data to a "Front Buffer" that the OS has invalidated or relocated.
So please reproduce, then try the above command, then try again.
If I'm right, you'll want to render some or many really complicated shapes first to make it more likely to get compressed.
- Cory
On February 15, 2026 5:04:35 AM PST, Mark Erbaugh via Discuss <discuss@lists.openscad.org> wrote:
>>> I’ve noticed that if leave OpenSCAD open and I’m not doing anything in the program, it will crash with a segmentation fault.
>
>Attached is a crash report. There were 3 in my console. All were similar (segmentation fault).
>
>Also, just as a check. I opened OpenScad and started with a new empty file and left it running overnight. No crash and is was still running in the morning.
>
>Mark
>
>
>
MK
Marius Kintel
Sun, Feb 15, 2026 5:51 PM
Thanks Mark,
This looks very similar to https://github.com/openscad/openscad/issues/6475
I don’t currently have access to macOS 26 on real hardware, only in a VM, so I haven’t been able to test this.
I don’t dare upgrade my main dev machine, but I’ll try to find a machine to test on.
In the meantime, please add any information you may have to that ticket and follow it for updates.
-Marius
Thanks Mark,
This looks very similar to https://github.com/openscad/openscad/issues/6475
I don’t currently have access to macOS 26 on real hardware, only in a VM, so I haven’t been able to test this.
I don’t dare upgrade my main dev machine, but I’ll try to find a machine to test on.
In the meantime, please add any information you may have to that ticket and follow it for updates.
-Marius
JH
Jeffrey Hayes
Mon, Feb 16, 2026 4:29 PM
i have tahoe, version 26, on my macbook .. i can try to reproduce this problem. do i need to have a particular file open, or just any old large complex rendering? and dev snap version or the stable release? i saw the version in the OG report but which one is best to reproduce in? -- jeff is vulcan_ in the cloud On Feb. 15, 2026, at 6:52 p.m., Marius Kintel via Discuss discuss@lists.openscad.org wrote: Thanks Mark, This looks very similar to https://github.com/openscad/openscad/issues/6475 I don’t currently have access to macOS 26 on real hardware, only in a VM, so I haven’t been able to test this. I don’t dare upgrade my main dev machine, but I’ll try to find a machine to test on. In the meantime, please add any information you may have to that ticket and follow it for updates. -Marius _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to discuss-leave@lists.openscad.org
i have tahoe, version 26, on my macbook .. i can try to reproduce this problem. do i need to have a particular file open, or just any old large complex rendering? and dev snap version or the stable release? i saw the version in the OG report but which one is best to reproduce in? -- jeff is vulcan_ in the cloud On Feb. 15, 2026, at 6:52 p.m., Marius Kintel via Discuss <discuss@lists.openscad.org> wrote: Thanks Mark, This looks very similar to https://github.com/openscad/openscad/issues/6475 I don’t currently have access to macOS 26 on real hardware, only in a VM, so I haven’t been able to test this. I don’t dare upgrade my main dev machine, but I’ll try to find a machine to test on. In the meantime, please add any information you may have to that ticket and follow it for updates. -Marius _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to discuss-leave@lists.openscad.org
CC
Cory Cross
Mon, Feb 16, 2026 4:48 PM
I think it should be the most recent snapshot you can get, and the file shouldn't matter, just render something complicated once.
On February 16, 2026 8:29:44 AM PST, Jeffrey Hayes via Discuss discuss@lists.openscad.org wrote:
i have tahoe, version 26, on my macbook .. i can try to reproduce this problem. do i need to have a particular file open, or just any old large complex rendering? and dev snap version or the stable release? i saw the version in the OG report but which one is best to reproduce in? -- jeff is vulcan_ in the cloud On Feb. 15, 2026, at 6:52 p.m., Marius Kintel via Discuss discuss@lists.openscad.org wrote: Thanks Mark, This looks very similar to https://github.com/openscad/openscad/issues/6475 I don’t currently have access to macOS 26 on real hardware, only in a VM, so I haven’t been able to test this. I don’t dare upgrade my main dev machine, but I’ll try to find a machine to test on. In the meantime, please add any information you may have to that ticket and follow it for updates. -Marius _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to discuss-leave@lists.openscad.org
I think it should be the most recent snapshot you can get, and the file shouldn't matter, just render something complicated once.
On February 16, 2026 8:29:44 AM PST, Jeffrey Hayes via Discuss <discuss@lists.openscad.org> wrote:
>i have tahoe, version 26, on my macbook .. i can try to reproduce this problem. do i need to have a particular file open, or just any old large complex rendering? and dev snap version or the stable release? i saw the version in the OG report but which one is best to reproduce in? -- jeff is vulcan_ in the cloud On Feb. 15, 2026, at 6:52 p.m., Marius Kintel via Discuss <discuss@lists.openscad.org> wrote: Thanks Mark, This looks very similar to https://github.com/openscad/openscad/issues/6475 I don’t currently have access to macOS 26 on real hardware, only in a VM, so I haven’t been able to test this. I don’t dare upgrade my main dev machine, but I’ll try to find a machine to test on. In the meantime, please add any information you may have to that ticket and follow it for updates. -Marius _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to discuss-leave@lists.openscad.org
