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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.

Master Builder Set

Checking

004 Master Builder Set

817 pieces in 76 part and color combinations.

LEGO counts 670 pieces. This inventory comes from a separate parts catalog and lists 817; 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.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

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Piece checklist

Bricks 528 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×8
  • Brick 1 x 2 without Bottom Tube Black Part 3065 ×6
  • Brick 2 x 2 without Inside Ridges Black Part 3003a ×4
  • Brick 2 x 3 without Cross Supports Black Part 3002a ×4
  • Brick 2 x 4 without Cross Supports Black Part 3001a ×6
  • Brick 1 x 1 Blue Part 3005 Element 300523 ×8
  • Brick 1 x 2 without Bottom Tube Blue Part 3065 ×6
  • Brick 2 x 10 Blue Part 3006 Element 4615600 or 300623 ×2
  • Brick 2 x 2 without Inside Ridges Blue Part 3003a ×4
  • Brick 2 x 3 without Cross Supports Blue Part 3002a ×4
  • Brick 2 x 4 without Cross Supports Blue Part 3001a ×16
  • Brick 10 x 20 without Bottom Tubes, with '+' Cross Support (early Baseplate) Light Gray Part 700b ×2
  • Brick 1 x 1 Red Part 3005 Element 300521 ×20
  • Brick 1 x 2 without Bottom Tube Red Part 3065 ×26
  • Brick 1 x 6 without Bottom Tubes, with 2 Raised Cross Supports Red Part 3009a ×2
  • Brick 1 x 8 without Bottom Tubes with Cross Side Supports Red Part 3008a ×2
  • Brick 2 x 10 Red Part 3006 Element 4617857 or 300621 ×6
  • Brick 2 x 2 without Inside Ridges Red Part 3003a ×22
  • Brick 2 x 3 without Cross Supports Red Part 3002a ×15
  • Brick 2 x 4 without Cross Supports Red Part 3001a ×96
  • Brick 2 x 8 Red Part 3007 Element 6036408 or 300721 ×4
  • Brick 1 x 2 without Bottom Tube Trans-Clear Part 3065 Element 6514262 or 6244904 Also in White ×6
  • Brick 2 x 2 without Inside Ridges Trans-Clear Part 3003a Also in White ×10
  • Brick 2 x 4 without Cross Supports Trans-Clear Part 3001a Also in White ×10
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×20
  • Brick 1 x 2 without Bottom Tube White Part 3065 Also in Trans-Clear ×26
  • Brick 1 x 6 without Bottom Tubes, with 2 Raised Cross Supports White Part 3009a ×2
  • Brick 1 x 8 without Bottom Tubes with Cross Side Supports White Part 3008a ×2
  • Brick 2 x 10 White Part 3006 Element 4617855 or 300601 ×6
  • Brick 2 x 2 without Inside Ridges White Part 3003a Also in Trans-Clear ×22
  • Brick 2 x 3 without Cross Supports White Part 3002a ×15
  • Brick 2 x 4 without Cross Supports White Part 3001a Also in Trans-Clear ×96
  • Brick 2 x 8 White Part 3007 Element 6619309 or 6033776 ×4
  • Brick 1 x 1 Yellow Part 3005 Element 300524 ×8
  • Brick 1 x 2 without Bottom Tube Yellow Part 3065 ×6
  • Brick 2 x 10 Yellow Part 3006 Element 6119276 or 6073100 ×2
  • Brick 2 x 2 without Inside Ridges Yellow Part 3003a ×4
  • Brick 2 x 3 without Cross Supports Yellow Part 3002a ×10
  • Brick 2 x 4 without Cross Supports Yellow Part 3001a ×16

Bricks Sloped 114 pieces

  • Brick Sloped 45° 2 x 1 Triple with Hollow Underside Red Part 3048a ×4
  • Brick Sloped 45° 2 x 1 without Bottom Pin Red Part 3040a ×4
  • Brick Sloped 45° 2 x 2 Red Part 3039 Element 303921 ×4
  • Brick Sloped 45° 2 x 2 Double Red Part 3043 Element 304321 ×4
  • Brick Sloped 45° 2 x 2 Double Concave Red Part 3046a Element 4218892 or 4200489 ×6
  • Brick Sloped 45° 2 x 2 Double Convex Red Part 3045 Element 4163087 or 304521 ×24
  • Brick Sloped 45° 2 x 3 Red Part 3038 Element 6303213 or 4195081 ×6
  • Brick Sloped 45° 2 x 4 Red Part 3037 Element 303721 ×48
  • Brick Sloped 45° 2 x 4 Double Red Part 3041 Element 4144003 or 304121 ×14

Bricks Round and Cones 80 pieces

  • Brick Round 1 x 1 Solid Stud Black Part 3062a ×6
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch Black Part 3063b Element 306326 ×4
  • Brick Round 1 x 1 Solid Stud Blue Part 3062a ×6
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch Blue Part 3063b Element 4497190 or 4239392 ×4
  • Brick Round 1 x 1 Solid Stud Red Part 3062a ×8
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch Red Part 3063b Element 306321 ×16
  • Brick Round 1 x 1 Solid Stud White Part 3062a ×10
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch White Part 3063b Element 4501579 or 306301 ×16
  • Brick Round 1 x 1 Solid Stud Yellow Part 3062a ×6
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch Yellow Part 3063b Element 306324 ×4

Wheels and Tyres 36 pieces

  • Tyre Smooth Old Style - Large Light Gray Part 36 ×4
  • Tyre Smooth Old Style - Small Light Gray Part 132a ×10
  • Wheel Old with 12 Studs Red Part 715 ×4
  • Wheel Old with 4 Studs Red Part 7039 Element 7039 ×10
  • Brick Special 2 x 4 with Wheel Holder Old, Clear Bottom, Red Inside White Part 7049bc01 ×8

Plates 26 pieces

  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×4
  • Plate 2 x 8 with Waffle Bottom White Part 3034a ×4
  • Plate 4 x 8 with Waffle Bottom White Part 3035a ×12
  • Plate 6 x 8 with Waffle Bottom White Part 3036a ×6

Windows and Doors 17 pieces

  • Door 1 x 2 x 3 Left with Hollow Studs, Fixed Glass Red Part 32bc01 ×4
  • Window 1 x 2 x 2 Classic, Extended Lip, Hollow Studs [with Glass] Red Part 3081bc01 ×6
  • Window 1 x 6 x 2 with Shutters [Old Style Extended Lip & Glass] Red Part 646bc01 ×4
  • Window 1 x 6 x 3 Panorama with Glass and Hollow Studs Red Part 604c01 ×3

Technic Gears 12 pieces

  • Gear Samsonite 35 Tooth Blue Part 743 ×1
  • Gear Samsonite 42 Tooth Red Part 744 ×3
  • Gear Samsonite 14 Tooth White Part 741 ×4
  • Gear Samsonite 21 Tooth Yellow Part 742 ×4

Hinges, Arms and Turntables 4 pieces

  • Turntable 4 x 4 - Old Type Complete, Perfectly Round White Part 3404bc01 ×4

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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