The Windows 3.1 Printing Software v1.1 was tested on both Windows NT v3.5 and Windows NT v3.5.1. However it was not tested under Windows NT 4.0.
This software has since been superceded by the Windows 3.1 LaserWriter software v.3.1, and the NT printer software is now a separate installer. Both are posted online. The NT software is supported on NT 3.51 and 4.0.
Alternatively, you could use the drivers that are included with Windows NT 4.0.