Missing Piece Checker: 9797-2 Mindstorms Education NXT Base Set

Checking

9797-2 Mindstorms Education NXT Base Set

491 pieces in 101 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. Many sets include a few extra small pieces. Check them before you order a replacement.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

Piece checklist

Technic Pins 160 pieces

Technic Pin Double with Axle Hole Black Part 32138 Element 4130597 or 4119589 ×2
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×8
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×36
Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×60
Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×10
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×36
Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×8

Technic Connectors 52 pieces

Technic Axle Connector Ridged [with x Hole x Orientation] Black Part 6538b Element 4113805 or 4107083 ×4
Technic Axle Connector Smooth [with x Hole + Orientation] Black Part 59443 Element 6084612 or 4512363 ×4
Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×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 3L with 2 Pin Holes Dark Bluish Gray Part 42003 Element 6273715 or 4210857 ×4
Technic Axle and Pin Connector Perpendicular Double Dark Bluish Gray Part 32291 Element 6280395 or 4210655 ×2
Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×20
Technic Pin Connector Hub Perpendicular 3 x 3 Bent with 4 Pins (Pin Ridges Across Part) Light Bluish Gray Part 55615 Element 4296059 ×6
Technic Pin Connector Hub Perpendicular 3L with 4 Pins Light Bluish Gray Part 48989 Element 4225033 ×2

Technic Axles 48 pieces

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 ×6
Technic Axle 6 Black Part 3706 Element 370626 ×4
Technic Axle 8 Black Part 3707 Element 370726 ×2
Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×2
Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×14
Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×8
Technic Axle 2 Notched Red Part 32062 Element 4142865 ×8

Technic Bricks 22 pieces

Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Dark Bluish Gray Part 32064a Element 6178919 or 4210935 ×2
Technic Brick 1 x 16 [15 Pin Holes] Light Bluish Gray Part 3703 Element 4211443 ×4
Technic Brick 1 x 2 [1 Pin Hole] Light Bluish Gray Part 3700 Element 4211440 ×4
Technic Brick 1 x 4 [3 Pin Holes] Light Bluish Gray Part 3701 Element 4211441 ×4
Technic Brick 1 x 6 [5 Pin Holes] Light Bluish Gray Part 3894 Element 4211466 ×4
Technic Brick 1 x 8 [7 Pin Holes] Light Bluish Gray Part 3702 Element 4211442 ×4

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 20 pieces

Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×4
Tyre 24 x 14 Shallow Tread (Tread Small Hub), Band Around Center of Tread Black Part 89201 Element 6132299 or 4639695 ×2
Tyre 56 x 26 Balloon Black Part 55976 Element 6495636 or 4297209 ×4
Technic Wedge Belt Wheel [aka Pulley] Light Bluish Gray Part 4185 Element 6321743 or 4494222 ×4
Wheel 18 x 14 with Pin Hole, Fake Bolts and Shallow Spokes Light Bluish Gray Part 55981 Element 6109684 or 4299119 ×2
Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Light Bluish Gray Part 56145 Element 4297210 ×4

Bricks 15 pieces

Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×8
Brick 2 x 2 Light Bluish Gray Part 3003 Element 4211387 ×4
Brick 1 x 2 without Bottom Tube Trans-Green Part 3065 Element 6514266 or 6244908 ×1
Brick 1 x 2 without Bottom Tube Trans-Red Part 3065 Element 6514263 or 6244905 ×1
Brick 1 x 2 without Bottom Tube Trans-Yellow Part 3065 Element 6514265 or 6244907 ×1

Plates 8 pieces

Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×4
Plate 1 x 4 Light Bluish Gray Part 3710 Element 4211445 ×4

Plates Special 6 pieces

Technic Plate 2 x 4 [3 Holes] Light Bluish Gray Part 3709 Element 4211444 ×2
Technic Plate 2 x 6 [5 Holes] Light Bluish Gray Part 32001 Element 4211542 ×2
Technic Plate 2 x 8 [7 Holes] Light Bluish Gray Part 3738 Element 4211449 ×2

String, Bands and Reels 4 pieces

Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Red Part 85544 Element 4544145 or 4544143 ×2
Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×2

Minifig Headwear 2 pieces

Hair Ponytail Black Part 6093 Element 609376 or 609326 ×1
Hat / Cap Short Curved Peak Red Part 86035 Element 4562544 ×1

Technic Beams Special 2 pieces

Technic Beam 3 x 0.5 Liftarm with Boss and Pin Semi-Reduced Light Bluish Gray Part 33299b Element 4563045 ×2

Technic Special 2 pieces

Ball, Hard Plastic, 51mm (approx. 6 studs diameter) Blue Part 41250 Element 4100758 ×1
Ball, Hard Plastic, 51mm (approx. 6 studs diameter) Red Part 41250 Element 4156530 ×1

Tiles 2 pieces

Tile 1 x 2 with Groove Dark Bluish Gray Part 3069b Element 4211052 ×2

Gear Parts 1 piece

Warning Leaflet [No Color/Any Color] Part 55543 Element 4527556 ×1

Minifig Heads 1 piece

Minifig Head, Black Eyebrows, Thin Grin, Eyes with White Pupils Print [Hollow Stud] Yellow Part 3626cpr0891 Element 4651441 ×1

Minifig Lower Body 1 piece

Hips and Orange Legs Orange Part 970c34 Element 6329305 or 4602964 ×1

Minifig Upper Body 1 piece

Torso, Sailboat with Sunset Print, Yellow Arms and Hands White Part 973c01h01pr1204 Element 4275606 ×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

9797-2 Mindstorms Education NXT Base Set

Before you call it missing

Your missing list