This issue is resolved with ClarisWorks 4.0v1
(tested with DeskWriter 550C and DeskWriter driver 6.0)
Normally, cell borders print as hairlines to a Hewlett-Packard DeskWriter. ClarisWorks 2.1v3, 2.1v4 and version 3.0 spreadsheets will print borders as hairlines on the first page of a print job, but all subsequent pages will print with very thick border lines.
Workarounds:
1. Revert to ClarisWorks 2.1v2 or earlier or upgrade to version 4
2. Print your pages one at a time. The thicker lines only occur on the second and subsequent pages of a print job.
This printing issue has been tested with the DeskWriter driver versions 3.9, 5.0 and 6.0.