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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.

EV3 Core Set

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45544 EV3 Core Set

547 pieces in 107 part and color combinations.

LEGO counts 541 pieces. This inventory comes from a separate parts catalog and lists 547; 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

Black 211 pieces

  • Cable, Connector, 25cm for EV3 Black Part 11145 Element 6178438 or 6024581 ×4
  • Cable, Connector, 35cm for NXT Black Part 55805 Element 6178439 or 6089560 ×2
  • Cable, Connector, 50cm for NXT Black Part 55806 Element 6178448 or 6089559 ×1
  • Cable, USB, 2m for EV3 Black Part 10916 Element 6192039 or 6036901 ×1
  • Storage Bin, Dacta, Medium [New Style] Black Part 54187 ×1
  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×4
  • Technic Axle 6 Black Part 3706 Element 370626 ×4
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Technic Axle Connector Double Flexible [Rubber] Black Part 45590 Element 4198367 ×4
  • Technic Axle and Pin Connector Angled #1 Black Part 32013 Element 6284699 or 4107085 ×4
  • Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×4
  • Technic Axle and Pin Connector Angled #6 - 90° Black Part 32014 Element 6268905 or 4107767 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Black Part 32184 Element 6276951 or 4121667 ×8
  • Technic Axle and Pin Connector Perpendicular Double Black Part 32291 Element 6280394 or 4140430 ×4
  • Technic Axle and Pin Connector Perpendicular Double Split Black Part 41678 Element 4162857 ×4
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Black Part 60483 Element 6265091 or 6006140 ×4
  • Technic Beam 1 x 3 Thick Black Part 32523 Element 4142822 or 3252326 ×2
  • Technic Beam 1 x 4 Thin Black Part 32449 Element 6327548 or 4142236 ×2
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Black Part 6629 Element 6279881 or 4119800 ×4
  • Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Black Part 33299a Element 4156980 ×2
  • Technic Beam 3 x 3 T-Shape Thick Black Part 60484 Element 4552347 or 4535771 ×4
  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×2
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] Black Part 32269 Element 4177430 ×2
  • Technic Gear 36 Tooth Double Bevel Black Part 32498 Element 4255563 or 4177434 ×2
  • Technic Knob Wheel Black Part 32072 Element 6284188 or 4248204 ×4
  • Technic Link Tread Wide with Two Pin Holes, Reinforced Black Part 88323 Element 6014648 ×54
  • Technic Panel Fairing #1 Small Smooth Short, Side A Black Part 87080 Element 4566251 ×1
  • Technic Panel Fairing #17 Large Smooth, Side A Black Part 64392 Element 4541326 ×1
  • Technic Panel Fairing #18 Large Smooth, Side B Black Part 64682 Element 4543490 ×1
  • Technic Panel Fairing #2 Small Smooth Short, Side B Black Part 87086 Element 4566249 ×1
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×60
  • Technic Tread Sprocket Wheel Large 10 Tooth Black Part 57519 Element 6526471 or 4582792 ×4
  • Technic Turntable Small Base, 28 Tooth Black Part 99010 Element 6326620 or 4652236 ×2
  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×4
  • Tyre 56 x 28 ZR Street Black Part 41897 Element 6518574 or 6035364 ×2

Light Bluish Gray 141 pieces

  • Battery Cover, EV3 Programable Brick Light Bluish Gray Part 99143 ×1
  • Battery Pack, Rechargeable, DC, EV3 Light Bluish Gray Part 95656 Element 6096416 or 6083365 ×1
  • Motor, Large, EV3 with White Case Light Bluish Gray Part 95658 Element 6219427 or 6148278 ×2
  • Motor, Medium, EV3 with White Case Light Bluish Gray Part 99455 Element 6230508 or 6148292 ×1
  • Sensor, Colour, EV3 with White Case Light Bluish Gray Part 95650 Element 6239012 or 6128869 ×1
  • Sensor, Gyro, EV3 with White Case Light Bluish Gray Part 99380 Element 6227055 or 6138411 ×1
  • Sensor, Touch, EV3 with White Case Light Bluish Gray Part 95648 Element 6227941 or 6138404 ×2
  • Sensor, Ultrasonic, EV3 Light Bluish Gray Part 95652 Element 6310609 or 6138403 ×1
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×14
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×6
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×5
  • Technic Axle 9 Light Bluish Gray Part 60485 Element 4535768 ×2
  • Technic Axle Connector Hub with 3 Axles at 120° Light Bluish Gray Part 57585 Element 4502595 ×2
  • Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×8
  • Technic Axle and Pin Connector Perpendicular Triple Light Bluish Gray Part 63869 Element 6331441 or 4538007 ×6
  • Technic Beam 1 x 11 Thick Light Bluish Gray Part 32525 Element 4611705 or 4534910 ×4
  • Technic Beam 1 x 13 Thick Light Bluish Gray Part 41239 Element 4522934 or 4156299 ×6
  • Technic Beam 1 x 5 Thick Light Bluish Gray Part 32316 Element 4211651 ×4
  • Technic Beam 1 x 7 Thick Light Bluish Gray Part 32524 Element 4495930 or 4211665 ×4
  • Technic Beam 1 x 9 Bent (7 - 3) Thick Light Bluish Gray Part 32271 Element 6276836 or 4211624 ×4
  • Technic Beam 1 x 9 Thick Light Bluish Gray Part 40490 Element 6102449 or 4211866 ×6
  • Technic Beam 3 x 5 L-Shape Thick Light Bluish Gray Part 32526 Element 4211713 ×2
  • Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Light Bluish Gray Part 64178 Element 4540797 ×1
  • Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Light Bluish Gray Part 64179 Element 4539880 ×3
  • Technic Beam Triangle Thin [Type II] Light Bluish Gray Part 99773 Element 6331428 or 6009019 ×4
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×10
  • Technic Gear 16 Tooth Reinforced [New Style] Light Bluish Gray Part 94925 Element 4640536 ×4
  • Technic Gear 40 Tooth Light Bluish Gray Part 3649 Element 6195314 or 4285634 ×2
  • Technic Pin Connector Hub Perpendicular 3 x 3 Bent with 4 Pins (Pin Ridges Across Part) Light Bluish Gray Part 55615 Element 4296059 ×4
  • Technic Pin Connector Hub Perpendicular 3L with 4 Pins Light Bluish Gray Part 48989 Element 4225033 ×6
  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes] Light Bluish Gray Part 87082 Element 4560175 ×4
  • Technic Pin Connector Round [Slotted] Light Bluish Gray Part 62462 Element 6173127 or 4526985 ×4
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 ×10
  • Technic Turntable Small Top Light Bluish Gray Part 99009 Element 4652235 ×2
  • Technic Worm Gear Light Bluish Gray Part 4716 Element 4211510 ×2
  • Wheel 43.2 x 26 Technic Racing Small with 6 Pinholes Light Bluish Gray Part 56908 Element 6276854 or 4634091 ×2

Blue 54 pieces

  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×20
  • Technic Beam 1 x 3 Thick Blue Part 32523 Element 4509376 or 4144284 ×4
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×30

Red 51 pieces

  • Storage / Sorting Tray, Dacta, 13 Cups [For New Style Storage Bins] Red Part 54572 ×1
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×10
  • Technic Axle Connector Smooth [with x Hole + Orientation] Red Part 59443 Element 4513174 ×6
  • Technic Beam 1 x 3 Thick Red Part 32523 Element 4153718 ×4
  • Technic Beam 2 x 4 L-Shape Thick Red Part 32140 Element 6271827 or 4141270 ×6
  • Technic Pin Connector Perpendicular 2 x 2 Bent Red Part 44809 Element 6008527 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×22

Dark Bluish Gray 25 pieces

  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×2
  • Technic Axle 8 with Stop Dark Bluish Gray Part 55013 Element 4499858 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Dark Bluish Gray Part 42003 Element 6273715 or 4210857 ×8
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×4
  • Technic Gear 8 Tooth [Reinforced] Dark Bluish Gray Part 10928 Element 6631413 or 6012451 ×4
  • Technic Steering Ball Joint Large Receptacle Dark Bluish Gray Part 92911 Element 4610380 ×1
  • Technic Wedge Belt Wheel [aka Pulley] Dark Bluish Gray Part 4185 Element 6321744 or 4587275 ×4

White 25 pieces

  • Hub, EV3 Brick [Complete Assembly] White Part 95646c01 Element 6261688 or 6187080 ×1
  • Technic Beam 1 x 11.5 Double Bent Thick White Part 32009 Element 6271161 or 6004157 ×4
  • Technic Beam 1 x 15 Thick White Part 32278 Element 4542578 or 4227533 ×6
  • Technic Beam 1 x 7 Bent (4 - 4) Thick White Part 32348 Element 6278132 or 4509912 ×6
  • Technic Beam 3 x 5 L-Shape Thick White Part 32526 Element 6632144 or 4585040 ×4
  • Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] White Part 41669 Element 4173941 ×4

Tan 16 pieces

  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×8
  • Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 1 spare in the box ×2
  • Technic Pin Long without Friction Ridges Tan Part 32556 ×6

Yellow 14 pieces

  • Technic Beam 1 x 3 Thick Yellow Part 32523 Element 4153707 ×4
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×10

Green 4 pieces

  • Technic Beam 1 x 3 Thick Green Part 32523 Element 6007973 or 4158868 ×4

Dark Tan 2 pieces

  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×2

[No Color/Any Color] 2 pieces

  • Activity Booklet - Cover and Inventory Card - Set 45544 [No Color/Any Color] Part 45544bc ×1
  • Sticker Sheet for Set 45544-1 [No Color/Any Color] Part 42806 ×1

Chrome Silver 1 piece

  • Technic Steel Ball 18 mm Chrome Silver Part 99948 Element 6114171 or 6079570 ×1

Trans-Clear 1 piece

  • Storage Bin Lid, Dacta [For New Style Trays] Trans-Clear Part 54190 ×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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