Posts: 1
Joined: Fri Mar 08, 2019 10:07 pm

Simplify3D will not start

Fri Mar 08, 2019 10:14 pm

So starting today I noticed that simplify3D would not start. When selecting a file through Fusion 360 to print nothing happens. Trying to launc S3D throug desktop icon does not work either. Opening a S3d file does not work either.

I ununistalled both my original version of S3d as well as the lattest updated version. Restarted windows 10 and did a fresh install of the latest download. No dice.

Restarted desktop, no dice!

Restored desktop to earlier date, restarted computer no dice!

Simplify3D will not luanch.

Any insight would be appreciated.

Thank you,


Posts: 434
Joined: Thu Aug 30, 2018 1:23 pm

Re: Simplify3D will not start

Wed Mar 13, 2019 9:41 am

Can you try the following:

Open Windows Explorer and navigate to the following directory:


You may need to enable hidden folders to access this directory. Once there, please try deleting the file called "savedState.factory". Then, open Simplify3D again.

Posts: 5
Joined: Fri Jan 19, 2018 6:49 pm

Re: Simplify3D will not start

Tue Jun 11, 2019 3:47 am

This worked for me.

SavedState was a directory not a file.
And I also deleted every other file in the S3D-software directory.

Posts: 2
Joined: Wed Jun 05, 2019 12:52 pm

Re: Simplify3D will not start

Tue Jun 11, 2019 9:22 am

Hi Barvogolf,

I'm experiencing the same issue and also made a post about it.
I usually fix the application startup issue deleting this exact key "HKEY_CURRENT_USER\Software\Simplify3D\S3D-Software\MainWindow" which looks to contain some file hostory information of some sort.
This way your profiles wil be untouched and you dont have to waste time to reconfigure the entire program, which i did like a couple of times...

Hope this helps for u and the devs will fix this issue soon.

Posts: 1
Joined: Fri Aug 17, 2018 10:41 am

Re: Simplify3D will not start

Mon Jan 20, 2020 3:19 pm

Has anyone found a real fix for this - Just started happening on my windows 10 system as well

Posts: 452
Joined: Thu Oct 06, 2016 5:13 pm

Re: Simplify3D will not start

Tue Jan 21, 2020 9:16 pm

there is a bug in windows 10 open gl on multiscreen setups ... I'm not able to figure out where / how it is happening but s3d is not only app affected (same issue with slic3r, prusa slicer, netfabb..) and solution for s3d is to delete all the registry keys under "HKEY_CURRENT_USER\Software\Simplify3D\S3D-Software\" that are named "geometry". This resets the location where s3d tries to open window at and everything works until you move any of the s3d window to your "non primary screen" and close it, next time you try to open that it will not work.

no clue how to solve this on system level, so far everyone I know having this problem is windows10 and nvidia.
gcodestat integrates with Simplify3D and allow you to
Calculate print time accurately (acceleration, max speed, junction deviation all taken into consideration)
Embed M117 codes into G-Code
Upload your G-Code directly to Octoprint
open source and unlicence

Posts: 21
Joined: Fri Jul 31, 2015 9:41 am

Re: Simplify3D will not start

Mon Jan 04, 2021 3:59 pm

Same issue here... And the guys here give a shit and don't even provide a workaround??? Clearly shows which direction this software is heading.

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