Select the text and do Path > Object to Path Shift+Ctrl+C. This will convert the text to outlines.
Ungroup the the text Shift+Ctrl+G
Path > Union Ctrl++. This will join up all the letters as one path.
Draw a rectangle over the text
Select both text and rectangle and do Path > Intersection Ctrl+*
The result will be all outlines so that your cutter will work properly.