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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.

World Robot Olympiad Expansion Set

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45819 World Robot Olympiad Expansion Set

568 pieces in 75 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

Technic Pins 140 pieces

  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Black Part 18651 Element 6089119 ×10
  • Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin Hole Black Part 66906 Element 6344752 ×10
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 ×30
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×20
  • Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Blue Part 42924 Element 6299413 ×10
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 ×10
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] Light Bluish Gray Part 65304 Element 6321747 ×10
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 ×10
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×20
  • Technic Pin Long without Friction Ridges, with Anti-Roll Notch Tan Part 39888 Element 6321305 ×10

Technic Connectors 76 pieces

  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes] Black Part 44874 Element 6366229 ×8
  • Technic Axle Connector with Axle Hole [Reinforced] Light Bluish Gray Part 42135 Element 6380605 ×8
  • Technic Axle and Pin Connector Angled #6 - 90° Light Bluish Gray Part 32014 Element 6268924 or 4509886 ×8
  • Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes) Light Bluish Gray Part 65489 Element 6282158 ×8
  • Technic Axle and Pin Connector Angled #1 Red Part 32013 Element 6332580 or 4254606 ×8
  • Technic Axle and Pin Connector Angled #5 - 112.5° Red Part 32015 Element 6271348 or 4227544 ×8
  • Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top] Red Part 32530 Element 4207715 or 3253021 ×4
  • Technic Axle and Pin Connector Angled #3 - 157.5° White Part 32016 Element 6261390 or 6063767 ×8
  • Technic Axle Connector Smooth [with x Hole + Orientation] Yellow Part 59443 Element 4519010 ×8
  • Technic Axle and Pin Connector Angled #2 - 180° Yellow Part 32034 Element 6344325 or 6210804 ×8

Technic Beams 68 pieces

  • Technic Beam 1 x 13 Thick Black Part 41239 Element 4522933 or 4164422 ×8
  • Technic Beam 1 x 9 Bent (7 - 3) Thick Black Part 32271 Element 6276835 or 4140327 ×4
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×4
  • Technic Beam 1 x 11.5 Double Bent Thick Blue Part 32009 Element 6271153 or 4112000 ×4
  • Technic Beam 3 x 5 L-Shape Thick Blue Part 32526 Element 4158923 ×4
  • Technic Beam 1 x 9 Thick Dark Bluish Gray Part 40490 Element 4645730 or 4210757 ×8
  • Technic Beam 3 x 3 T-Shape Thick Dark Bluish Gray Part 60484 Element 4552349 or 4535773 ×8
  • Technic Beam 1 x 5 Thick Light Bluish Gray Part 32316 Element 4211651 ×8
  • Technic Beam 2 x 4 L-Shape Thick Red Part 32140 Element 6271827 or 4141270 ×4
  • Technic Beam 1 x 3 Thick White Part 32523 Element 6632140 or 4208160 ×8
  • Technic Beam 3 x 5 L-Shape Thick White Part 32526 Element 6632144 or 4585040 ×4
  • Technic Beam 2 x 4 L-Shape Thick Yellow Part 32140 Element 6271828 or 4141628 ×4

Technic Axles 56 pieces

  • Technic Axle 12 Black Part 3708 Element 370826 ×4
  • Technic Axle 4 Black Part 3705 Element 370526 ×8
  • Technic Axle 8 Black Part 3707 Element 370726 ×8
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×8
  • Technic Axle 10 Red Part 3737 Element 6130005 or 4267858 ×4
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×8
  • Technic Axle 6 Red Part 3706 Element 6130002 or 4191526 ×8
  • Technic Axle 3 Yellow Part 4519 Element 6130007 ×8

Tiles 48 pieces

  • Tile 2 x 4 with Groove Black Part 87079 Element 4560182 ×16
  • Tile 1 x 4 with Groove Blue Part 2431 Element 243123 ×8
  • Tile 1 x 4 with Groove Red Part 2431 Element 243121 ×8
  • Tile 1 x 8 with Groove White Part 4162 Element 6552110 or 416201 ×16

Plates 24 pieces

  • Plate 1 x 8 Red Part 3460 Element 346021 ×8
  • Plate 4 x 8 White Part 3035 Element 6609533 or 303501 ×8
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×8

Plates Round Curved and Dishes 24 pieces

  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×8
  • Plate Round Corner 4 x 4 Blue Part 30565 Element 6146306 or 4143267 ×8
  • Plate Round 6 x 6 with Hole Green Part 11213 Element 6097413 ×4
  • Dish 6 x 6 Inverted (Radar) with Solid Studs White Part 44375b Element 4514791 ×4

Technic Bricks 24 pieces

  • Technic Brick 1 x 16 [15 Pin Holes] Red Part 3703 Element 370321 ×8
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×8
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Yellow Part 32064a Element 6206240 or 4233484 ×8

Technic Bushes 20 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 ×10
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 ×10

Wheels and Tyres 16 pieces

  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×8
  • Technic Wedge Belt Wheel [aka Pulley] White Part 4185 Element 6564907 or 6330136 ×8

Bricks Round and Cones 12 pieces

  • Brick Round 2 x 2 with Axle Hole Blue Part 3941 Element 614373 or 614323 ×8
  • Cone 4 x 4 x 2, Axle Hole [Plain] White Part 3943b Element 6108662 or 4288051 ×4

Bricks Special 8 pieces

  • Brick Special 1 x 2 with Pin - Bottom Stud Holder Black Part 44865 Element 6393322 ×8

Hinges, Arms and Turntables 8 pieces

  • Hinge Brick 1 x 4 [Lower] White Part 3831 Element 6619285 or 383101 ×4
  • Hinge Brick 1 x 4 [Upper] White Part 3830 Element 6327411 or 6011456 ×4

Technic Panels 8 pieces

  • Technic Panel 3 x 11 x 1 Dark Bluish Gray Part 15458 Element 6127205 ×4
  • Technic Panel 3 x 7 x 1 Yellow Part 71709 Element 6334490 ×4

Technic Steering, Suspension and Engine 8 pieces

  • Technic Link 1 x 6 without Stoppers Black Part 32005a Element 4629921 or 4530733 ×4
  • Technic Link 1 x 9 Black Part 32293 Element 6244698 or 4141300 ×4

Tiles Special 8 pieces

  • Tile Special 2 x 2 with Top Pin [Squared Holes] White Part 49153 Element 6313138 ×8

Flags, Banners and Signs 4 pieces

  • Flag 2 x 2 Square, Flared Clip Edge [Thick Clips] Red Part 80326 Element 6365459 ×2
  • Flag 2 x 2 Square, Flared Clip Edge [Thick Clips] White Part 80326 Element 6365487 ×2

Minifig Shields, Weapons, & Tools 4 pieces

  • Weapon Lance Flat Silver Part 3849 Element 4611884 ×4

String, Bands and Reels 4 pieces

  • Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×4

Technic Beams Special 4 pieces

  • Technic Beam Frame 7 x 11 Black Part 39794 Element 6265643 ×2
  • Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Light Bluish Gray Part 64179 Element 4539880 ×2

Technic Special 4 pieces

  • Technic Ball Joint White Part 32474 Element 6052864 or 4585627 ×4

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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