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LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

RoboSports

Checking

9730 RoboSports

91 pieces in 37 part and color combinations.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

Blue 38 pieces

  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×8
  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×8
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×6
  • Hose Rigid 3mm D. 18L / 14.4cm Blue Part 75c18 Element 4517521 or 4116885 ×2
  • Plate 1 x 10 Blue Part 4477 Element 447723 ×2
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×2
  • Plate 1 x 8 Blue Part 3460 Element 346023 ×2
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×2
  • Plate 2 x 6 Blue Part 3795 Element 379523 ×2
  • Technic Axle and Pin Connector Angled #3 - 157.5° Blue Part 32016 Element 6261397 or 6177396 ×2
  • Technic Brick 1 x 12 [11 Pin Holes] Blue Part 3895 Element 389523 ×2

Yellow 21 pieces

  • Ball 41mm Yellow Part 72048 Element 4112928 ×2
  • Brick 2 x 2 Yellow Part 3003 Element 4103588 or 300374 ×4
  • Brick Sloped 33° 3 x 2 with Red '2' over Two Green Stripes Print Yellow Part 3298pr0023 Element 82497 ×1
  • Brick Sloped 45° 2 x 2 Yellow Part 3039 Element 303924 ×4
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Yellow Part 3747b Element 4500459 or 374724 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Yellow Part 3660 Element 366024 ×2
  • Plate 6 x 8 Yellow Part 3036 Element 4552333 or 4166761 ×4
  • Wheel 43.2 x 28 Balloon Small Yellow Part 6580 Element 4496701 or 4183681 ×2

Black 19 pieces

  • Brick Sloped 33° 3 x 2 with Red '1' and Yellow Outline Print Black Part 3298pr0024 Element 82496 ×1
  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×2
  • Disk 45mm x 15mm Black Part upn0242 Element 4112929 ×2
  • Rubber Band Large [Square Cross Section] Black Part 70158 ×3
  • Technic Axle 4 Black Part 3705 Element 370526 ×2
  • Technic Brick 1 x 16 [15 Pin Holes] Black Part 3703 Element 370326 ×4
  • Tyre 43 x 17 Black Part 3634 Element 4523564 or 363426 ×2
  • Tyre 43.2 x 28 Balloon Small Black Part 6579 Element 657926 ×2
  • Wire with Brick 2 x 2 x 2/3 Pair, 20L Black Part 5306bc020 Element 4100355 ×1

Light Gray 9 pieces

  • Motor, 9V Mini [Old Style] Light Gray Part 71427c01 Element 4107786 ×1
  • Plate 2 x 4 Light Gray Part 3020 Element 302002 ×2
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Light Gray Part 2654 Element 265402 ×1
  • Technic Gear 24 Tooth [Old Style - Three axle holes] Light Gray Part 3648a ×2
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 1 spare in the box ×3

[No Color/Any Color] 2 pieces

  • CD-Rom, for 9730 [No Color/Any Color] Part 4113096 ×1
  • Playmat, Test Mat for Mindstorms RoboSports [No Color/Any Color] Part 4122123 Element 4122123 ×1

Red 1 piece

  • Brick Sloped 33° 3 x 2 with Red '3', Black Triangle Print Red Part 3298pr0037 Element 82498 ×1

White 1 piece

  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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