From Crochet at About.com:
"Fantasy Bat" Free Chart
Designed by Sandi Marshall
This chart is free for your own personal use only.
|Working the Chart in Filet Crochet
For a 4 dc mesh, beginning chain is 151, plus chain 3, (which will count as first dc of first row), plus chain 2 (which is the ch-2 of first open mesh) for a total starting chain of 156 chains. Begin by working a double crochet in the 9th chain from the hook. Follow chart for placement of solid mesh and open mesh for each row. For a refresher on how to do open and solid mesh, see Basics link below.
Chart is worked starting at the bottom right; work first row right to left. Second row is worked left to right. Continue alternating row directions in this same manner, following chart.
If you'd rather work the chart in a 3-dc filet, How To Figure The Starting Chain For 3-dc Filet: http://crochet.about.com/library/blfiletchain.htm
Approximate finished sizes in filet crochet
(once through one chart, worked in 4 dc mesh):
With size 5 thread: (320 yards) and a size US 4 steel hook, finished size is about 13.9 inches x 15.8 inches.
With size 10 thread: (285 yards) and a size US 7 steel hook, finished size is about 11.5 inches x 12.5 inches.
With size 20 thread: (268 yards) and a size US 9 steel hook, finished size is about 11 inches x 12 inches.
With size 30 thread: (250 yards) and a size US 11 steel hook, finished size is about 10.5 inches x 11.5 inches.
With fingering/baby weight yarn: (625 yards) and a size US F hook, finished size is about 35 inches x 36 inches.
With sport weight yarn: (725 yards) and a size US G hook, finished size is about 40 inches x 41 inches.
With worsted weight yarn: (825 yards) and a size US I hook, finished size is about 45 inches x 46 inches.
With size 5 thread: 5 squares = 1.4 inches, 5 rows = 1.6 inches
With size 10 thread: 5 squares = 1.2 inches, 5 rows = 1.3 inches
With size 20 thread: 5 squares = 1.1 inches, 5 rows = 1.2 inches
With size 30 thread: 5 squares = 1 inch, 5 rows = 1.1 inches
With fingering/baby weight yarn: 5 squares = 3.5 inch, 5 rows = 3.6 inches
With sport weight yarn: 5 squares = 4 inch, 5 rows = 4.1 inches
With worsted weight yarn: 5 squares = 4.5 inch, 5 rows = 4.6 inches
Basics in How to Do Filet Crochet, here: http://crochet.about.com/library/weekly/aa050298.htm
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