This is my amigurumi dodecahedron.
I adapted the pattern from Berroco, found here, to make it amigurumi. I ended up with 2 different patterns, one makes the points more rounded & the other more pointy. I used the more pointy version I used a ball of some worsted weight cotton that I have had for years and a 3.50 sized hook. My dodecahedron ended up about 7 inches in height and width.
Rounded point pattern
Ch 3, 4 sc in 2nd chain
Row 1 - 2 sc in each sc around - 8 sc
Row 2 - sc, (2sc in each sc around) 7 times - 15 sc
Row 3 - sc around - 15 sc
Row 4 - (sc, 2sc, sc) 5 times around - 20 sc
Row 5 - sc around - 20 sc
Row 6 - (sc, sc, 2sc, sc) 5 times around - 25 sc
Row 7 - sc around - 25 sc
Row 8 - (sc, sc, 2sc, sc, sc) 5 times around - 30 sc
Row 9 - sc around - 30 sc
Row 10 - (sc, sc, 2sc, sc, sc, sc) 5 times around - 35 sc
Row 11 & 12 - sc around - 35 sc
Leave long tail for stitching - 4"-6"
Pointy point pattern
Ch 3, 4 sc in 2nd chain
Row 1 - 2 sc in each sc around - 8 sc
Row 2 - sc, (2sc in each sc around) 7 times - 15 sc
Rows 3 to 5- sc around - 15 sc each
Row 6 - (sc, 2sc, 2sc) 5 times - 25 sc
Row 7 to 9 - sc around - 25 sc each
Row 10 - (2sc, sc, sc, 2sc, sc) 5 times - 35 sc
Row 11 & 12 - sc around - 35 sc each
Leave long tail for stitching - 4"-6"
Now for assembly,which I find challenging to explain,even though it is really simple once you see the pattern, so I have photos to help
Crochet 12 points, using whichever method pattern you prefer
Mark one as point one. Stitch another point to it, joining 7 scs together, using one of the point's long tail.
Take a 3rd point and attach it, using it's tail to 1 and 2, with 7 scs on each point, for a total of 14scs joined
Attach 4th point to points 1 and 3 as before.
Attach 5th point to points 1 and 4 as before.
Attach 6th point to points 1, 2, and 5, for a total of 21 scs joined, completing the bottom circle.
At this point you can probably see how the rest of it will be assembled. Take point 7 and attach it to points 2 and 3 (or any 2 points really), for a total of 14 scs joined. Attach point 8 to points 7, 3, and 4 for a total of 21 scs joined.
Continue attaching points 9, 10, and 11 this way (11 being attached on 4 sides for 28 scs)
Stuff the dodecahedron as firmly or as loosely as you prefer. Leave all the loose ends of tails inside. If you used the more pointy shaped version of the points, be sure to get the tips of the points well & firmly stuffed or they will squish flat quickly. Once you have it stuffed, attach 28 scs of the 12th point, stuff the 12th point and stitch the final 7scs closed. Weave in the end of this tail.