BlockTalk Find Your Set

Free tool

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.

Busy City - Master Builders (Masterbuilders)

Checking

3058 Busy City - Master Builders (Masterbuilders)

70 pieces in 48 part and color combinations, plus 1 minifigure.

The piece count includes the 4 parts inside the set's minifigures, which this inventory lists separately. 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.

Show

Piece checklist

Bricks 8 pieces

  • Brick 1 x 4 Black Part 3010 Element 301026 ×4
  • Brick 2 x 6 Black Part 2456 Element 4181144 or 245626 ×1
  • Brick 1 x 4 Yellow Part 3010 Element 301024 ×1
  • Brick 1 x 6 Yellow Part 3009 Element 300924 ×2

Wheels and Tyres 8 pieces

  • Tyre 21 x 12 with Offset Tread Small Wide Black Part 6015 Element 601526 ×4
  • Wheel 11 x 12 with Hole Round for Wheels Holder Pin Light Gray Part 6014a ×4

Plates 7 pieces

  • Plate 1 x 2 Black Part 3023 Element 302326 ×1
  • Plate 1 x 4 Black Part 3710 Element 371026 ×2
  • Plate 2 x 4 Light Gray Part 3020 Element 302002 ×1
  • Plate 2 x 8 Light Gray Part 3034 Element 303402 ×1
  • Plate 4 x 8 Light Gray Part 3035 Element 303502 ×1
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×1

Bricks Sloped 6 pieces

  • Brick Sloped 45° 2 x 1 with Bottom Pin Trans-Dark Blue Part 3040b Element 4109710 ×2
  • Brick Sloped 33° 3 x 4 Yellow Part 3297 Element 6256980 or 6088712 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Yellow Part 3040b Element 4121965 or 304024 ×2
  • Brick Sloped 45° 2 x 2 Yellow Part 3039 Element 303924 ×1

Bricks Special 5 pieces

  • Brick Special 1 x 2 with Grille Light Gray Part 2877 Element 287702 ×3
  • Brick Special 1 x 2 with Vertical Clip [Thick U Clip] Light Gray Part 30237a Element 4117069 ×2

Hinges, Arms and Turntables 4 pieces

  • Hinge Brick 2 x 2 Locking with 1 Finger Vertical [No Axle Hole] Light Gray Part 30389a ×1
  • Hinge 1 x 2 Locking with 2 Fingers and Towball Socket, 9 Teeth Red Part 30396 Element 4144565 or 4140703 ×1
  • Hinge Brick 1 x 2 Locking with 1 Finger Vertical End and 2 Fingers Vertical End, 9 Teeth Yellow Part 30386 Element 4140704 ×1
  • Hinge Brick 1 x 4 Locking with 1 Finger Vertical End and 2 Fingers Vertical End, 9 Teeth Yellow Part 30387 Element 4218728 or 4144568 ×1

Plates Special 4 pieces

  • Plate Special 2 x 2 with Wheel Holder Black Part 4488 Element 6092658 or 448826 ×1
  • Plate Special 2 x 2 with Wheel Holders Black Part 4600 Element 460026 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Yellow Part 3794a ×1

Bars, Ladders and Fences 3 pieces

  • Lever Small Base with Black Lever Light Gray Part 298c02 Element 73588 1 spare in the box ×1
  • Bar 1 x 4 x 2 with Studs Yellow Part 4083 Element 408324 ×2

Tiles Special 3 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Light Gray Part 2412b Element 241202 ×2
  • Tile Special 2 x 2 with Top Pin Yellow Part 2460 Element 246024 ×1

Transportation - Land 3 pieces

  • Vehicle Base 4 x 10 x 1 2/3, Inverted Slope Double, 1 x 2 Cutouts Black Part 30235 Element 4113812 ×1
  • Construction Vehicle Bucket 3 x 6, 9 Hinge Teeth Yellow Part 30394 Element 4140709 ×1
  • Steering Stand 1 x 2 with Black Steering Wheel Yellow Part 3829c01 Element 9553 ×1

Transportation - Sea and Air 3 pieces

  • Helicopter Skid Rails 12 x 6 Black Part 30248 Element 6469627 or 4546206 ×1
  • Propeller 3 Blade Small Light Gray Part 2421 Element 242102 ×1
  • Propeller 4 Blade 5 Diameter with Rounded Ends, Open Hub Light Gray Part 2479 Element 247902 ×1

Panels 2 pieces

  • Panel 1 x 2 x 1 [Square Corners] Yellow Part 4865a Element 486524 ×2

Plates Round Curved and Dishes 2 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Green Part 6141 Element 6514057 or 6240221 1 spare in the box ×1
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×1

Plates Wedged 2 pieces

  • Wedge Plate 4 x 9 without Stud Notches Black Part 2413 Element 6002201 or 4286023 ×2

Tiles 2 pieces

  • Tile 1 x 4 with Groove Yellow Part 2431 Element 243124 ×2

Bricks Wedged 1 piece

  • Brick Wedged, Sloped 6 x 4 Cutout, No Stud Notches Black Part 6153a Element 615326 ×1

Gear Parts 1 piece

  • Idea Book, Master Builders Busy City [No Color/Any Color] Part b3058 ×1

Minifig Accessories 1 piece

  • Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun Light Gray Part 4349 Element 434902 ×1

Minifig Headwear 1 piece

  • Helmet, Standard Black Part 2446 Element 6020155 or 4654642 ×1

Minifig Headwear Accessories 1 piece

  • Headwear Accessory Visor For Standard Helmet Trans-Light Blue Part 2447 Element 4652811 or 244742 1 spare in the box ×1

Stickers 1 piece

  • Sticker Sheet for Set 3058-1 [No Color/Any Color] Part 23103 Element 4142044 ×1

Supports, Girders and Cranes 1 piece

  • Hook with Towball Dark Gray Part 30395 Element 4140702 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 3 x 4 x 1 1/3 with 2 Studs on Top Trans-Dark Blue Part 2437 Element 4114165 ×1

Minifigures 1 figure

  • Construction Worker, Green Jacket with Pockets, Green Cap, Sunglasses 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.

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.

We value your privacy

We use cookies 🍪 for analytics and to improve your experience. Read our privacy policy