Papa’s Best STL Thumbnails
A shell extension that adds preview thumbnails for STL files to Windows Explorer. Runs on Windows 7 or later.
Thumbnail generation is based on the fastest STL viewer available. Folders full of STL files are no problem, and most STL thumbnails are generated as fast as those of JPG photos.
endsolidmarkers (123D, IRONCAD)
Papa’s Best STL Thumbnails installs for the current user by default. To install it for all users on a system:
msiexec /i "Papas Best STL Thumbnails.msi" MSIINSTALLPERUSER=""
Ensure thumbnails are generally enabled. Are thumbnails working with other file types on your system, e.g. photos? If not, you may have disabled them altogether.
Is User Account Control (UAC) disabled? UAC is not only a strong protection against malicious software, it also properly isolates user accounts from one another. Since the STL Thumbnails install in a user context, they may not run properly with UAC disabled. If you are absolutely sure about keeping UAC disabled, perform an installation for all users.
Clear your thumbnail cache. This forces Explorer to request new thumbnails instead of relying on outdated data.
Download my diagnostic tool. It mimics the way Explorer requests thumbnails, and may point at the issue.
Best STL Thumbnails Diagnostics x86.exevia double-click
Best STL Thumbnails Diagnostics x64.exe
Clear your Explorer thumbnail cache (via the drive cleanup) or copy the file to a different location.
This is a bug in Windows 10 that also affects other thumbnails – for example transparent PNG images here and here.
I can’t do anything in my program to work around it, I’m afraid. Please use the Windows 10 feedback function to report this to Microsoft. If enough users do it, they may eventually fix it. Windows 7 does not have this bug.
Encountered a problem? Have a suggestion? Let me know: firstname.lastname@example.org