Intermec PX4i User Manual page 26

Chapter 1 — Using the Printer
12
6 If you are using a media roll with a 76 mm (3 in) core, install a
3-inch adapter on the media supply hub.
7 Fit a new roll of media on the supply post and push the roll in as
far as it will go.
PX4i and PX6i High Performance Printer User's Manual