Overview:
ThinPrint is a third-party software, and when you are trying to set up a default printer, it may not work as you hoped. If you are struggling with this, there are a few areas to check to resolve the issue.
Check the default printer on that PC:
Open Control Panel.
Select Devices and Printers.
Right-click Printer and select Set to default.
Check the default printer set in Delta:
Select File in the top left of Delta.
Open Preferences.
On the Printing tab, in the Report Frame, select the Default Printer.
Click OK to save.
Check ThinPrint:
When Delta is open, ThinPrint will also open.
In the bottom right, find the orange ThinPrint icon.
Right-click this icon and select Configure. You can have this default to one Printer or have all printers passed in to Delta.
If you want to have one default printer, select the Use this printer option and click OK.
If you want to pass all printers into Delta, select the Inherit system default printer option and click OK.