Missing Piece Checker: 31313 Mindstorms EV3

Checking

31313 Mindstorms EV3

601 pieces in 102 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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. Compare each color with the step's parts callout, especially White against Trans-Clear.
The spare pieces. This set comes with 4 spare pieces, marked on each row of the checklist. One may be the piece you need.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

Piece checklist

Technic Pins 195 pieces

Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×95
Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×6
Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×28
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×38
Technic Axle Towball Light Bluish Gray Part 2736 Element 6443149 or 4211375 ×6
Technic Pin Double with Axle Hole Light Bluish Gray Part 32138 Element 4211888 ×4
Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×4
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×10
Technic Pin Long without Friction Ridges Tan Part 32556 ×4

Wheels and Tyres 22 pieces

Technic Tread Large [36 Links] Black Part 53992 Element 6089573 or 6070518 ×2
Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×3
Tyre 14 x 6 Solid Smooth Black Part 50951 Element 4246901 ×2
Tyre 43.2 x 22 ZR Black Part 44309 Element 4184286 ×4
Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Black Part 56145 Element 4299389 or 4284946 ×4
Technic Wedge Belt Wheel [aka Pulley] Light Bluish Gray Part 4185 Element 6321743 or 4494222 ×3
Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×4

Technic Gears 21 pieces

Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×2
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Black Part 18575 Element 6346535 or 6093977 ×4
Technic Gear 36 Tooth Double Bevel Black Part 32498 Element 4255563 or 4177434 ×5
Technic Knob Wheel Black Part 32072 Element 6284188 or 4248204 ×4
Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×2
Technic Worm Gear Type 2 Light Bluish Gray Part 32905 Element 6185471 ×2
Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×1
Technic Gear 20 Tooth Bevel Tan Part 32198 Element 6031962 or 4514557 ×1

Technic Bushes 20 pieces

Technic Bush Red Part 3713 Element 6271820 or 4227155 1 spare in the box ×9
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×11

Technic Panels 14 pieces

Technic Panel Car Mudguard Left White Part 61071 Element 6015597 or 4540101 ×1
Technic Panel Car Mudguard Right White Part 61070 Element 6015596 or 4540100 ×1
Technic Panel Fairing # 3 Small Smooth Long, Side A White Part 64683 Element 4547581 ×3
Technic Panel Fairing # 4 Small Smooth Long, Side B White Part 64391 Element 4547582 ×3
Technic Panel Fairing #5 Long Smooth, Side A White Part 64681 Element 4558802 ×3
Technic Panel Fairing #6 Long Smooth, Side B White Part 64393 Element 4558797 ×3

Technic Special 12 pieces

Technic Cam Black Part 6575 Element 4143187 ×2
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] Red Part 41669 Element 4185661 ×6
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] White Part 41669 Element 4173941 ×4

Large Buildable Figures 7 pieces

Large Figure Weapon, Zamor Sphere Holder Black Part 53550 Element 6286430 or 6024109 ×1
Large Figure Weapon Sword, 11.5L with Sawtooth Back with Flat Silver Blade Red Part 98568pat0002 Element 6286140 or 4657296 ×6

Technic Steering, Suspension and Engine 6 pieces

Technic Link 1 x 6 without Stoppers Black Part 32005a Element 4629921 or 4530733 ×2
Technic Link 1 x 9 Black Part 32293 Element 6244698 or 4141300 ×4

Minifig Accessories 4 pieces

Wing / Blade 1 x 4 with Pin Hole White Part 98347 Element 4656205 ×4

Projectiles / Launchers 4 pieces

Large Figure Weapon, Zamor Sphere Launcher Black Part 54271 Element 6024106 ×1
Projectile, Large Figure Weapon, Zamor Sphere / Ball Red Part 54821 Element 4545430 ×3

Technic Beams Special 4 pieces

Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Light Bluish Gray Part 64178 Element 4540797 ×2
Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Light Bluish Gray Part 64179 Element 4539880 ×2

Stickers 1 piece

Sticker Sheet for Set 31313-1 [No Color/Any Color] Part 13710 Element 6031766 ×1

String, Bands and Reels 1 piece

Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Red Part 85544 Element 4544145 or 4544143 ×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.

LEGO Missing Piece Checker

31313 Mindstorms EV3

Before you call it missing

Your missing list