The GFS 0.25 grid "b" files are now also available for use through the GFS grib filter. The endpoint we need to use is filter_gfs_0p25b.pl (notice the "b" in there).
Quoting the official NCEP communique:
"GFS users,
NCEP has made the GFS quarter degree secondary parameters (gfs.tCCz.pgrb2b.0p25.fFFF) available through grib filter to allow for partial downloads. We hope that users will take advantage of this to alleviate some of the bandwidth issues we are experiencing during peak periods. You can start using the path through here -
filter_gfs_0p25b.pl
Please let us know if you have any questions.
Carissa Klemmer
NCEP Central Operations
Production Management Branch Dataflow Team
301-683-3835
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"
Happy filtering!

-Ivan