Hi, dev team.
I do a lot of 3d work and this results in having folders full of .stl files, the standard files for 3d printing. Using the Marlin Printer Tool I did get MS explorer to show these files as images, but the images do not show up in XY. That is a shame, and it would be great if XY would be able to show such file types in the future.
Of course, its an omission from Microsoft in the first place.
<any thanks, Maarten
STL support
Re: STL support
Hi Maarten
First of all, welcome to the forum.
The problem you describe is usually one of a missing 32bit preview handler. Many programs install 64bit handlers only on 64bit systems but since XY is still 32bit (and will be for the foreseeable future - search the forum for more info on this) you need to find and install such preview handler either manually or find a program that installs a 32bt version of it.
First of all, welcome to the forum.
The problem you describe is usually one of a missing 32bit preview handler. Many programs install 64bit handlers only on 64bit systems but since XY is still 32bit (and will be for the foreseeable future - search the forum for more info on this) you need to find and install such preview handler either manually or find a program that installs a 32bt version of it.
Ralph 
(OS: W11 23H2 Home x64 - XY: Current beta - Office 2019 32-bit - Display: 1920x1080 @ 125%)

(OS: W11 23H2 Home x64 - XY: Current beta - Office 2019 32-bit - Display: 1920x1080 @ 125%)
Re: STL support
Did you add "stl" to
"Configuration | Preview | Previewed Formats | Categories"
"Image Files"?
I can preview .stl files (on a Win7 x86 system) with the current beta of XYplorer with no problems (using
Marlin3DprinterToolStlConfiguration.exe to register the .dll and choosing to open .stl files with
Marlin3DprinterStlViewer.exe as the default application) after a reboot...
"Configuration | Preview | Previewed Formats | Categories"
"Image Files"?
I can preview .stl files (on a Win7 x86 system) with the current beta of XYplorer with no problems (using
Marlin3DprinterToolStlConfiguration.exe to register the .dll and choosing to open .stl files with
Marlin3DprinterStlViewer.exe as the default application) after a reboot...
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Re: STL support
What program is being used as the Preview Handler? I can not get this to work in Windows 11.
Tried Power Toys and other viewers but not seeing any any handler in ShellExViewer
stl>{E64164EB-1AE0-4C50-BAEF-A413C2B3A4BC}
Bill
Tried Power Toys and other viewers but not seeing any any handler in ShellExViewer
stl>{E64164EB-1AE0-4C50-BAEF-A413C2B3A4BC}
Bill
Re: STL support
The original post clearly says that they are using Marlin.
I have never tried Powertoys myself, but I know you have to manually enable stl in the config under File Explorer Addons, also you will need this enabled:
Configuration | Other | Shell Integration | 64-bit Windows | Use 64-bit preview handlers for preview
Here is an alternate previewer you could try if you wanted.
https://github.com/unlimitedbacon/stl-thumb
I have never tried Powertoys myself, but I know you have to manually enable stl in the config under File Explorer Addons, also you will need this enabled:
Configuration | Other | Shell Integration | 64-bit Windows | Use 64-bit preview handlers for preview
Here is an alternate previewer you could try if you wanted.
https://github.com/unlimitedbacon/stl-thumb
Re: STL support
When I use Marlin the preview pane is solid white. It does give me a pop up window with the preview in it. The issue there is if I click on 5 .STLs then 5 image previews from Marlin will pop up and I will need to close each one individually I did try the github stl viewer but no preview in the preview pane there either.
This is what I have configured in Preview > Previewed Formats >
Catogories:
User Defined Preview Handlers pdf,stl
User Defined Preview Handlers:
*.pdf, Adobe Acrobat Document > {CF822AB4-6DB5-4FDA-BC28-E61DF36D2583}, PDF-XChange PDF Preview Provider
*.stl, MarlinSTLviewer > {E64164EB-1AE0-4C50-BAEF-A413C2B3A4BC}, Microsoft 3MF Shell Thumbnail and Preview Handler
Thanks again.
XYBill
This is what I have configured in Preview > Previewed Formats >
Catogories:
User Defined Preview Handlers pdf,stl
User Defined Preview Handlers:
*.pdf, Adobe Acrobat Document > {CF822AB4-6DB5-4FDA-BC28-E61DF36D2583}, PDF-XChange PDF Preview Provider
*.stl, MarlinSTLviewer > {E64164EB-1AE0-4C50-BAEF-A413C2B3A4BC}, Microsoft 3MF Shell Thumbnail and Preview Handler
Thanks again.
XYBill
Re: STL support
To use the github one, I think you'd probably need to add stl to Preview as Thumbnail category, and remove/disable it from UDPH, but with it installed, to see if it is working, check if you get thumbnails in the list first, you will have to enable x64 thumbnails with it, via running this cmd from XY address bar once:
and then refreshing thumbnails. I can't help with Marlin or Powertoys, never used them, possibly someone else can.
extlist("Thumbs64", "stl", a);
and then refreshing thumbnails. I can't help with Marlin or Powertoys, never used them, possibly someone else can.