Machine-Readable
Papa’s Best STL Thumbnails icon

Buy 1 Get 1 Free Sunglasses -

A shell extension that adds preview thumbnails for STL files to Windows Explorer. Runs on Windows 7 or later.

Can also be used with Total Commander and FreeCommander.

Papa’s Best STL Thumbnails displaying a folder with random STLs from thingiverse

Download

Updated (changes, license).

Feel free to donate if you like my program!

64-bit Setup

recommended

32-bit Setup

for old systems

Video Guide

Michael from Teaching Tech made a video guide about the installation. He was so kind to allow me to embed it here! Thumbnail installation starts at 1:49.

Fast

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.

Free

Compatible

Papa’s Best STL thumbnail viewer displays countless STL variations, even where other programs fail:

Buy 1 Get 1 Free Sunglasses -

Leo was a man who lived his life in the checkout lane of "Good Enough." When he saw the neon sign screaming in the window of a dusty boardwalk shop, he didn't see a scam; he saw a solution.

He walked out five minutes later wearing a pair of "Midnight Aviators" that felt suspiciously like recycled soda bottles. The "free" pair—a garish set of neon-pink wayfarers—he shoved into his back pocket, thinking they’d make a decent joke gift for his niece. buy 1 get 1 free sunglasses

The world exploded into a silent, vintage cinema. The sand turned into powdered sugar; the seagulls flew in slow-motion trails of light; and the people on the beach weren't just sunbathing—they had glowing, colorful auras that pulsed with their moods. A grumpy lifeguard glowed a sharp, jagged red; a toddler with an ice cream cone was a soft, radiating sunshine yellow. Leo was a man who lived his life

"Cheap plastic," he muttered, rubbing his eyes. He swapped them for the "free" pink pair. The world exploded into a silent, vintage cinema


Installation for all users

Papa’s Best STL Thumbnails installs for the current user by default. To install for all users on a system, open a command prompt or a PowerShell and run msiexec /i "Papas Best STL Thumbnails.msi" MSIINSTALLPERUSER="".

Repeat with every update!

Leo was a man who lived his life in the checkout lane of "Good Enough." When he saw the neon sign screaming in the window of a dusty boardwalk shop, he didn't see a scam; he saw a solution.

He walked out five minutes later wearing a pair of "Midnight Aviators" that felt suspiciously like recycled soda bottles. The "free" pair—a garish set of neon-pink wayfarers—he shoved into his back pocket, thinking they’d make a decent joke gift for his niece.

The world exploded into a silent, vintage cinema. The sand turned into powdered sugar; the seagulls flew in slow-motion trails of light; and the people on the beach weren't just sunbathing—they had glowing, colorful auras that pulsed with their moods. A grumpy lifeguard glowed a sharp, jagged red; a toddler with an ice cream cone was a soft, radiating sunshine yellow.

"Cheap plastic," he muttered, rubbing his eyes. He swapped them for the "free" pink pair.


Dark background on some thumbnails

a folder with two thumbnails whose background is entirely black

Clear your Explorer thumbnail cache (see above) 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.


Something Missing?

Encountered a problem? Have a suggestion? Let me know: