Robot Birthday Cake | Crochet Pattern

What better way to celebrate the Instructables Robot’s birthday than with a cake…a crochet cake! This playful project combines my love of crochet with a whimsical design that captures the charm of the mascot. Using soft, chunky yarn, you’ll create a squishy amigurumi cake that looks just like the robot—complete with antennas, a cheerful face, and even a “20” to mark this special occasion.

Beginner-friendly and quick to work up thanks to chunky yarn, this project makes a perfect decoration or cuddly keepsake. Follow the step-by-step instructions, and by the end you’ll have your very own plush robot cake to show off. Let’s get crocheting!

(All yarn is chunky/super bulky unless stated otherwise)

1. Yellow – Main Body/Cake
2. Black – Side antennas, Mouth, Unibrow, Base Stripe, Number 20
3. Red – Icing, Ears, Eye Rings
4. Gray – Robot Buttons and Candles
5. Orange – Candle Flames
6. Black worsted weight yarn – Embroidered control box

Crochet Hook: Size 8 mm (or size recommended for your chunky yarn).

Stuffing: Polyester fiberfill (plenty—chunky yarn projects need more).

30 mm safety eyes

Large Tapestry Needle

Stitch Markers (Optional but helpful for keeping track of rounds. I generally just use a small piece of yarn as I find it to be much faster and simpler.)

Scissors

White paint marker

Abbreviations:

ch – chain

sl st – slip stitch

sc – single crochet

hdc – half double crochet

inc – increase (2 sc in the same stitch)

st(s) – stitch(es)

BO – bobble stitch

Note on Bobble Stitches: For this project, each bobble stitch is made with 3 double crochets (dc) in the same stitch, not 5 as in a standard bobble.

R1. Using chunky yellow yarn, Ch 2. Sc 6 in the second ch from the hook (6)

R2. Inc in each stitch around. (12)

R3. (1sc, inc) x 6 (18)

R4. (inc, sc 2) x 6 (24)

R5. (sc 3, inc) x 6 (30)

R6. (Inc, sc 4) x 6 (36)

R7. (sc 5, inc) x 6 (42)

R8. (inc, sc 6) x 6 (48)

R9. (sc 7, inc) x 6 (54)

R10. (inc, sc 8) x 6 (60)

R11. (sc 9, inc) x 6 (66)

R12. (Blo) Sc in each stitch around. (66)

Change to black yarn.

R13. (Blo) Sl st in each stitch around. (66)

Change back to yellow yarn.

R14. (Blo) Sl st in each stitch around. (66)

R15. (Blo) Sc in each stitch around. (66)

R16-R22. Sc in each stitch around. (66)

Tie off leaving a long yarn tail for sewing to the top.

R1. Using chunky yellow yarn, Ch 2. Sc 6 in the second ch from the hook (6)

R2. Inc in each stitch around. (12)

R3. (1sc, inc) x 6 (18)

R4. (inc, sc 2) x 6 (24)

R5. (sc 3, inc) x 6 (30)

R6. (Inc, sc 4) x 6 (36)

R7. (sc 5, inc) x 6 (42)

R8. (inc, sc 6) x 6 (48)

R9. (sc 7, inc) x 6 (54)

R10. (inc, sc 8) x 6 (60)

R11. (sc 9, inc) x 6 (66)

Tie off and weave in the yarn tail.

Attach red yarn to the top edge of your base cake. Then while working in only the front loops of the base and top (BO, sl st) x 33 (66)

(Make sure to stuff your cake before sewing completely closed)

Once finished tie off and tuck in the yarn tail.

To crochet the icing on the bottom of the cake:

Work in the front loops of R11, use red yarn to (BO, sl st) x 33 (66)

Once finished tie off and tuck in the yarn tail.

R1. Using chunky yellow yarn, Ch 2. Sc 6 in the second ch from the hook (6)

R2. Inc in each stitch around. (12)

R3. (1sc, inc) x 6 (18)

R4. (inc, sc 2) x 6 (24)

R5. (sc 3, inc) x 6 (30)

R6. (Inc, sc 4) x 6 (36)

R7. (sc 5, inc) x 6 (42)

R8. (inc, sc 6) x 6 (48)

R9. (Blo) Sc in each stitch around. (48)

R10 – R16. Sc in each stitch (48)

Tie off and leave a long yarn tail for sewing.

Start sewing the top cake layer to the base, keeping it centered. Before closing completely, add stuffing, then finish sewing shut.

1. Use a white paint marker to add a bold dot to each safety eye.

Eye Rings (Make two)

R1. Using chunky red yarn, Ch 2. Sc 6 in the second ch from the hook. (6)

R2. (2sc, inc) x 2 (8)

Tie off and leave a yarn tail for sewing.

1. Insert the safety eyes into the eye rings and secure.
2. Sew the eyes to the top cake layer (head) between rounds 11 and 14, about 2sts apart.

1. Using chunky black yarn, embroider a mouth between rounds 15 and 16. Make it about 10sts wide and position it slightly to the left of the eyes.

1. Embroider the unibrow between rows 9 and 10, about 10sts wide. Place it slightly to the right of the eyes.

Ears (Make two)

R1. Using chunky red yarn, Ch 2. Sc 6 in the second ch from the hook. (6)

R2. Inc in each stitch around. (12)

R3. (1sc, inc) x 6 (18)

Tie off leaving a yarn tail for sewing.

Sew each ear to the sides of the head, placing them between rounds 10 and 14, about 5 stitches out from the eyes. Make sure both ears are even before securing them fully.

Antennas (make two, worked in rows)

R1. Ch 5, turn. (5)

R2. Hdc in the second ch from hook, then hdc in each of the next 3 sts. (4)

Fasten off, leaving a tail for sewing. Fold the strip in half lengthwise and whip stitch the edges together to form a tight tube shape.

Using the yarn tail, sew the antenna to the center of the ear. Repeat for the other side. Make sure the antennas are centered to the ear.

Front Panel Buttons (Make three)

R1. Using chunky gray yarn, Ch 2. Sc 6 in the second ch from the hook. (6)

Tie off and leave a yarn tail for sewing to the body.

Sew the buttons to the front of the base cake between rounds 19 and 21, each about 2sts apart.

Front Control Panel: Using worsted-weight black yarn, embroider a rectangle on the front of the robot between Rounds 15 and 18, approximately 13 stitches wide. Then, embroider a diagonal line from the top right corner to the bottom left corner of the rectangle.

Candle Stick (Make two)

R1. Using chunky gray yarn, Ch 6. Turn. (6)

R2. Hdc in the second ch from the hook. Then Hdc in the remaining 4sts. Ch 1 and turn. (5)

R3. Hdc in each stitch across.

Tie off. Then fold the rectangle in half lengthwise and sew together the two edges. (Leave extra yarn for attaching the candle to the cake.)

Candle Flame (Make two)

R1. Using chunky orange yarn, Ch 2. (Sc, Hdc, Sc) in the second chain from the hook.

Tie off and attach to the top of the candle stick.

(Each line represents one stitch)

Number 2

Ch 11

sc in second ch from hook

sc

skip one ch

3sctog

skip one ch

sc

sc

2 sc in next ch

2 sc in next ch

sc

sc in side of last stitch (to curve bottom)

ch 3, sl st back into same st (makes bottom point)

Finish off with a long tail for sewing

Weave in short end

Use tail to sew on

Number 0

Ch 9

sl st to first ch to form a ring

sc in same st

sc

2 sc in next st

sc

sc

2 sc in next st

sc

sc

join with sl st to first sc

Finish off with a long tail for sewing

Using a yarn needle and the leftover yarn tails, sew the number “20” in the exact center on top of the cake/head. Then, sew a candle on each side of the numbers while making sure everything is evenly spaced and aligned.

Congratulations! You’ve completed your very own crochet robot cake, perfect for celebrating the Instructables Robot’s birthday—or just for fun! Take a moment to admire all your hard work and creativity.

Your robot cake is ready to join the party—or just sit proudly on your shelf!