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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.

ROBOLAB Starter Building Set

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9780 ROBOLAB Starter Building Set

1,708 pieces in 216 part and color combinations, plus 1 minifigure.

LEGO counts 1,615 pieces. This inventory comes from a separate parts catalog and lists 1,712, including the 4 parts inside the minifigures; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

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

Light Gray 674 pieces

  • Baseplate 16 x 32 Light Gray Part 3857 Element 4219612 or 274802 ×1
  • Bracket 2 x 2 - 2 x 2 Light Gray Part 3956 Element 395602 ×4
  • Motor Pulley, 9V Micromotor with axle hole Light Gray Part 2983 Element 298630 ×10
  • Motor, 9V Mini [Lightweight New Style] Light Gray Part 43362c01 Element 4176779 ×3
  • Plate 1 x 1 Light Gray Part 3024 Element 302402 ×8
  • Plate 1 x 10 Light Gray Part 4477 Element 447702 ×8
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×20
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×10
  • Plate 1 x 6 Light Gray Part 3666 Element 366602 ×10
  • Plate 1 x 8 Light Gray Part 3460 Element 346002 ×10
  • Plate 2 x 10 Light Gray Part 3832 Element 383202 ×8
  • Plate 2 x 2 Light Gray Part 3022 Element 302202 ×8
  • Plate 2 x 3 Light Gray Part 3021 Element 302102 ×1
  • Plate 6 x 10 Light Gray Part 3033 Element 303302 ×1
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Light Gray Part 2654 Element 265402 ×1
  • Plate Special 1 x 2 with Door Rail Light Gray Part 32028 Element 4109642 ×8
  • Plate Special 2 x 2 with 2 Pin Holes Light Gray Part 2817 Element 281702 ×2
  • Sensor, Touch Light Gray Part 879 Element 4247135 or 4209116 ×4
  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Light Gray Part 6553 Element 655302 ×10
  • Technic Axle Connector Ridged [with x Hole x Orientation] Light Gray Part 6538b Element 4113804 or 4100408 ×28
  • Technic Axle Connector with Axle Hole Light Gray Part 32039 Element 4106469 ×4
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×53
  • Technic Axle and Pin Connector Angled #1 Light Gray Part 32013 Element 4106376 ×4
  • Technic Axle and Pin Connector Angled #5 - 112.5° Light Gray Part 32015 Element 4106378 ×4
  • Technic Axle and Pin Connector Perpendicular Light Gray Part 6536 Element 4173667 or 653602 ×6
  • Technic Axle and Pin Connector Perpendicular 3L with Pin Hole Light Gray Part 32068 Element 4114669 ×2
  • Technic Beam 1 x 3 Thin Light Gray Part 6632 Element 4107825 ×4
  • Technic Beam 1 x 4 Thin with Stud Connector Light Gray Part 2825 Element 4107133 or 282502 ×8
  • Technic Beam 1 x 5 Thin Light Gray Part 32017 Element 4106885 ×4
  • Technic Brick 1 x 2 [2 Pin Holes] Light Gray Part 32000 Element 3200002 ×3
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Light Gray Part 32064a Element 4233488 or 4117071 ×2
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×125
  • Technic Bush 1/2 Smooth with Axle Hole Reduced Light Gray Part 32123a ×54
  • Technic Cam Light Gray Part 6575 Element 657502 ×4
  • Technic Engine Crankshaft Center Light Gray Part 2854 Element 285402 ×4
  • Technic Gear 12 Tooth Bevel Light Gray Part 6589 Element 658902 ×20
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Gray Part 4019 Element 4107176 or 401902 ×10
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Gray Part 3650c Element 365002 ×10
  • Technic Gear 24 Tooth [Old Style - Three axle holes] Light Gray Part 3648a ×10
  • Technic Gear 40 Tooth Light Gray Part 3649 Element 364902 ×4
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×15
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×10
  • Technic Pin 1/2 without Friction Ridges Light Gray Part 4274 Element 427402 ×49
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×68
  • Technic Plate 2 x 4 [3 Holes] Light Gray Part 3709 Element 370902 ×8
  • Technic Plate 2 x 6 [5 Holes] Light Gray Part 32001 Element 3200102 ×8
  • Technic Plate 2 x 8 [7 Holes] Light Gray Part 3738 Element 373802 ×12
  • Technic Steering Pulley Large Light Gray Part 3736 Element 373602 ×2
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×10
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×2

Black 660 pieces

  • Arm Grab Jaw Black Part 4221 Element 422126 ×4
  • Arm Piece with Pin, 2 Fingers Black Part 6048a Element 604826 ×4
  • Brick 1 x 2 Black Part 3004 Element 300426 ×20
  • Brick 1 x 4 Black Part 3010 Element 301026 ×6
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 ×20
  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×4
  • Brick 2 x 4 Black Part 3001 Element 300126 ×28
  • Brick 2 x 6 Black Part 2456 Element 4181144 or 245626 ×6
  • Brick 2 x 8 Black Part 3007 Element 6037390 or 300726 ×8
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×8
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×12
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Black Part 3747a ×4
  • Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×4
  • Hinge Brick 1 x 2 Base Black Part 3937 Element 393726 ×2
  • Hinge Brick 1 x 2 Top Plate Thin Black Part 3938 Element 393826 ×2
  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Black Part 4275b Element 427526 ×2
  • Hinge Tile 1 x 2 1/2 with 2 Fingers on Top Black Part 4531 Element 453126 ×2
  • Hose, Ribbed 7mm D. 9L / 7.2cm Black Part 78c09 Element 6443871 or 6420612 ×4
  • Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 ×6
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×6
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×2
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Black Part 4085c Element 408526 ×2
  • Rubber Band Large [Square Cross Section] Black Part 70158 ×32
  • Rubber Band Medium (Square Cross Section) Thin Cut Black Part 70012 Element 70012 ×70
  • Rubber Band Small 13mm (Square Cross Section) Black Part 71509 Element 4141606 or 4107153 ×27
  • Support Leg Small [Insectoids] Black Part 30211 Element 4119218 ×4
  • Technic Axle 10 Black Part 3737 Element 373726 ×10
  • Technic Axle 12 Black Part 3708 Element 370826 ×8
  • Technic Axle 2 Notched Black Part 32062 Element 4109810 or 3206226 ×24
  • Technic Axle 3 Black Part 4519 Element 6238084 or 451926 ×30
  • Technic Axle 4 Black Part 3705 Element 370526 ×20
  • Technic Axle 5 Black Part 32073 Element 4114740 ×22
  • Technic Axle 6 Black Part 3706 Element 370626 ×14
  • Technic Axle 8 Black Part 3707 Element 370726 ×12
  • Technic Beam 1 x 11.5 Double Bent Thick Black Part 32009 Element 6271152 or 4111998 ×4
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Black Part 6629 Element 6279881 or 4119800 ×4
  • Technic Brick 1 x 10 [9 Pin Holes] Black Part 2730 Element 273026 ×10
  • Technic Brick 1 x 12 [11 Pin Holes] Black Part 3895 Element 389526 ×10
  • Technic Brick 1 x 16 [15 Pin Holes] Black Part 3703 Element 370326 ×6
  • Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×12
  • Technic Brick 1 x 4 [3 Pin Holes] Black Part 3701 Element 370126 ×10
  • Technic Brick 1 x 6 [5 Pin Holes] Black Part 3894 Element 389426 ×12
  • Technic Brick 1 x 8 [7 Pin Holes] Black Part 3702 Element 370226 ×12
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×18
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×78
  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×10
  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×10
  • Tile Round 2 x 2 with Bottom Cross Black Part 4150 Element 415076 or 415026 ×1
  • Tile Special 1 x 1 with Clip and Straight Tips Black Part 2555 Element 255526 ×2
  • Tread Large, Technic [34 Links] Black Part 71372 Element 4107488 ×2
  • Tyre 30 x 10.5 Offset Tread Black Part 2346 Element 234676 or 234626 ×4
  • Tyre 30.4 x 14 VR Black Part 6578 Element 4561806 or 657826 ×2
  • Tyre 43 x 17 Black Part 3634 Element 4523564 or 363426 ×2
  • Tyre 49.6 x 28 VR Black Part 6594 Element 75778 ×2
  • Tyre 81.6 x 15 Motorcycle Black Part 2902 Element 6226880 or 4562873 ×4
  • Tyre Offset Tread 24 x 8 Black Part 3483 Element 4501048 or 348326 ×2
  • Wire with Brick 2 x 2 x 2/3 Pair, 162L Black Part 5306bc162 Element 75656 ×2
  • Wire with Brick 2 x 2 x 2/3 Pair, 20L Black Part 5306bc020 Element 4100355 ×11
  • Wire with Brick 2 x 2 x 2/3 Pair, 36L Black Part 5306bc036 Element 75652 ×1

Dark Gray 72 pieces

  • Brick Separator v1.0 Dark Gray Part 6007 Element 600727 ×1
  • Brick Special 1 x 2 with Pin Dark Gray Part 2458 Element 4113907 or 245827 ×2
  • Plate Special 1 x 2 with 4 x 4 disk at 90 degrees Dark Gray Part 30209 Element 4114692 ×2
  • Technic Axle 3 with Stud Dark Gray Part 6587 Element 4113884 or 658727 ×12
  • Technic Gear Differential, 24 -16 Tooth with Clutch on Both Sides Dark Gray Part 6573 Element 657327 ×1
  • Technic Pin 3/4 Dark Gray Part 32002 Element 4109854 ×54

White 68 pieces

  • Brick 1 x 16 White Part 2465 Element 6552092 or 246501 ×2
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×11
  • Brick 1 x 2 x 5 with Blocked Open Studs and Bottom Stud Holder with Asymmetric Ridges White Part 2454a ×3
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×4
  • Brick 1 x 3 x 5 with Side Supports White Part 3755a Element 375501 ×5
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×1
  • Brick 2 x 2 Corner White Part 2357 Element 6552088 or 6548253 ×2
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×1
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×1
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×2
  • Cone 1 x 1 [No Top Groove] White Part 4589 Element 458901 ×2
  • Dish 4 x 4 Inverted [Radar] White Part 3960 Element 396001 ×2
  • Light Brick 1 x 2 with Single Side Light White Part 6035 Element 4603220 or 74880 ×4
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×1
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×2
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×2
  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 ×3
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×2
  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] White Part 3700 Element 6619284 or 370001 ×1
  • Technic Pin Connector Round [No Slot] White Part 75535 Element 75535 ×1
  • Technic Tread Hub White Part 32007 Element 4107487 ×4
  • Wheel 49.6 x 28 VR with X Axle Hole White Part 22253 ×2
  • Wheel 61.6 x 13.6 Motorcycle White Part 2903 Element 290301 ×4
  • Wheel Rim 24 x 14 VR with Center Axle Hole White Part 2994 Element 4496671 or 299401 ×4

Yellow 54 pieces

  • Arm Grab Jaw Holder, 3 Fingers Yellow Part 4220 Element 4107528 or 422024 ×2
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×4
  • Brick Sloped 45° 2 x 1 with Bottom Pin Yellow Part 3040b Element 4121965 or 304024 ×4
  • Brick Sloped Inverted 45° 2 x 1 Yellow Part 3665 Element 366524 ×4
  • Cone 1 x 1 [No Top Groove] Yellow Part 4589 Element 458924 ×2
  • Hose Rigid 3mm D. 19L / 15.2cm Yellow Part 75c19 Element 4579744 or 4118600 ×2
  • Plate 1 x 3 Yellow Part 3623 Element 362324 ×2
  • Plate 2 x 4 Yellow Part 3020 Element 302024 ×6
  • Technic Axle and Pin Connector Angled #1 Yellow Part 32013 Element 6329889 or 4107066 ×4
  • Technic Beam 1 x 11.5 Double Bent Thick Yellow Part 32009 Element 6271150 or 6257104 ×4
  • Technic Beam 1 x 7 Thin Yellow Part 32065 Element 4114672 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Yellow Part 3700 Element 370024 ×4
  • Technic Rubber Belt Medium [26mm ID] [Round Cross Section] Yellow Part 85545 ×4
  • Wheel with Split Axle hole Yellow Part 3482 Element 348224 ×10

Green 51 pieces

  • Brick 1 x 2 Green Part 3004 Element 4107736 or 300428 ×4
  • Brick 2 x 4 Green Part 3001 Element 4106356 or 300128 ×2
  • Brick Curved 2 x 3 Green Part 6215 Element 621528 ×4
  • Brick Sloped 45° 2 x 2 Green Part 3039 Element 303928 ×3
  • Plate 1 x 2 Green Part 3023 Element 302328 ×2
  • Plate 1 x 6 Green Part 3666 Element 366628 ×2
  • Plate 2 x 2 Green Part 3022 Element 302228 ×2
  • Plate 2 x 8 Green Part 3034 Element 303428 ×4
  • Technic Beam 1 x 11.5 Double Bent Thick Green Part 32009 Element 4111999 or 4107753 ×2
  • Technic Beam 1 x 5 Thin Green Part 32017 Element 4114232 ×12
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Green Part 32064a Element 6206248 or 4233489 ×10
  • Technic Brick 1 x 4 [3 Pin Holes] Green Part 3701 Element 4107790 ×2
  • Wedge Plate 3 x 6 Cut Corners Green Part 2419 Element 241928 ×2

Red 38 pieces

  • Brick Sloped Inverted 45° 2 x 1 Red Part 3665 Element 366521 ×2
  • Motor Cover, 9V Micromotor 2 x 2 Red Part 2984 Element 4109831 or 298421 ×1
  • Motor Cover, 9V Micromotor 2 x 2 Base Red Part 2985 Element 4109830 or 298521 ×1
  • Motor, 9V Micromotor 2 x 2 Red Part 2986 Element 70823 ×1
  • Plate 1 x 10 Red Part 4477 Element 447721 ×1
  • Plate 1 x 2 Red Part 3023 Element 302321 ×6
  • Plate 2 x 10 Red Part 3832 Element 383221 ×2
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×1
  • Technic Brick 1 x 10 [9 Pin Holes] Red Part 2730 Element 273021 ×3
  • Technic Brick 1 x 12 [11 Pin Holes] Red Part 3895 Element 389521 ×2
  • Technic Brick 1 x 16 [15 Pin Holes] Red Part 3703 Element 370321 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×7
  • Technic Brick 1 x 6 [5 Pin Holes] Red Part 3894 Element 389421 ×3
  • Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×3
  • Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×2
  • Tile Round 2 x 2 with Bottom Cross Red Part 4150 Element 415071 or 415021 ×1

Blue 28 pieces

  • Ball, Hard Plastic, 51mm (approx. 6 studs diameter) Blue Part 41250 Element 4100758 ×1
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×4
  • Plate Round 1 x 1 with Solid Stud Blue Part 6141 Element 614123 ×3
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Blue Part 4032a Element 403223 ×2
  • Sensor, Light with Fixed Cable Blue Part 2982c01 Element 4119421 ×3
  • Technic Axle and Pin Connector Angled #1 Blue Part 32013 Element 6332570 or 4107797 ×6
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Blue Part 32064a Element 6206251 or 6132158 ×4
  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Blue Part 85544 ×3
  • Turntable 2 x 2 Plate, Base Blue Part 3680 Element 368023 ×2

Orange 21 pieces

  • Brick 1 x 4 Orange Part 3010 Element 4118827 ×2
  • Brick Sloped 33° 3 x 2 Orange Part 3298 Element 4121742 ×8
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Orange Part 3747a Element 4121737 ×5
  • Plate 1 x 4 Orange Part 3710 Element 4118782 ×4
  • Plate 2 x 6 Orange Part 3795 Element 4121741 ×2

Dark Turquoise 19 pieces

  • Hose Rigid 3mm D. 36L / 28.8cm Dark Turquoise Part 75c36 Element 4116939 ×2
  • Hose, Ribbed 7mm D. 9L / 7.2cm Dark Turquoise Part 78c09 Element 4275293 or 4114737 ×4
  • Technic Beam 1 x 11.5 Double Bent Thick Dark Turquoise Part 32009 Element 4114012 or 4112276 ×4
  • Technic Beam 1 x 6 Thin Dark Turquoise Part 32063 Element 4112299 ×4
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Dark Turquoise Part 6629 Element 4114291 or 4112285 ×5

Bright Green 4 pieces

  • Storage Bin, Dacta, Medium Bright Green Part upn0038 ×2
  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Bright Green Part 85544 ×2

Purple 4 pieces

  • Hose, Ribbed 7mm D. 12L / 9.6cm Purple Part 78c12 Element 4275294 or 4114738 ×4

Trans-Clear 4 pieces

  • Brick 1 x 2 without Bottom Tube Trans-Clear Part 3065 Element 6514262 or 6244904 ×1
  • Brick Round 1 x 1 Open Stud Trans-Clear Part 3062b Element 6514232 or 6223655 ×1
  • Storage Bin Lid, Dacta, 19 x 24 Trans-Clear Part 71082 ×2

Trans-Neon Green 4 pieces

  • Antenna 8H Whip Trans-Neon Green Part 2569 Element 6265159 or 6164380 ×2
  • Dome Hemisphere 4 x 4 Multifaceted Trans-Neon Green Part 30208 Element 6031104 or 4114690 ×2

Trans-Dark Blue 3 pieces

  • Brick 1 x 2 without Bottom Tube Trans-Dark Blue Part 3065 Element 6514264 or 6244906 ×1
  • Wing Insectoid Large with Arm Hinge and Circuitry Print Left (Print on Top, Tip on Left, Logo at Back Edge) Trans-Dark Blue Part 30230pr0001 Element 4114643 ×1
  • Wing Insectoid Large with Arm Hinge and Circuitry Print Right (Print on Top, Tip on Right, Logo at Back Edge) Trans-Dark Blue Part 30230pr0002 Element 4114642 ×1

Trans-Neon Orange 2 pieces

  • Creature Body Part, Dragon Wing Trans-Neon Orange Part 6133 Element 4106519 ×2

Trans-Green 1 piece

  • Brick 1 x 2 without Bottom Tube Trans-Green Part 3065 Element 6514266 or 6244908 ×1

Trans-Red 1 piece

  • Brick 1 x 2 without Bottom Tube Trans-Red Part 3065 Element 6514263 or 6244905 ×1

Minifigures 1 figure

  • Blue Jacket, White Legs, Black Hair Minifigure, checked as a whole figure ×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.

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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.