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The Workshop Sheet 10 of 21

LEGO Missing Piece Checker

Enter a set number, mark each piece found or missing, and leave with a list of what is missing, the element IDs LEGO asks for and links to buy the parts. It is free and needs no account. Rule out the usual hiding places first.

Chromosomes - Student Set

Checking

9743 Chromosomes - Student Set

136 pieces in 22 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.

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Piece checklist

Black 49 pieces

  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs Black Part 4276b Element 4264363 or 4256402 ×24
  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Black Part 4275b Element 427526 ×24
  • Wedge Plate 3 x 6 Cut Corners Black Part 2419 Element 241926 ×1

Green 25 pieces

  • String with End Studs and Minifig Grips 21L Green Part 14210 Element 6411972 or 6195813 ×24
  • Wedge Plate 3 x 6 Cut Corners Green Part 2419 Element 241928 ×1

Light Bluish Gray 24 pieces

  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×4
  • Plate 1 x 3 Light Bluish Gray Part 3623 Element 4211429 or 3623194 ×8
  • Plate 1 x 6 Light Bluish Gray Part 3666 Element 4211438 ×8
  • Plate 1 x 8 Light Bluish Gray Part 3460 Element 4211425 ×4

Red 13 pieces

  • Brick 1 x 1 Red Part 3005 Element 300521 ×4
  • Plate 1 x 1 Red Part 3024 Element 302421 ×4
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×4
  • Wedge Plate 3 x 3 Cut Corner Red Part 2450 Element 245021 ×1

Blue 8 pieces

  • Plate 1 x 1 Blue Part 3024 Element 302423 ×4
  • Tile 1 x 2 with Groove Blue Part 3069b Element 306923 ×4

Brown 5 pieces

  • Brick 1 x 1 Brown Part 3005 Element 4160990 or 300525 ×4
  • Wedge Plate 3 x 3 Cut Corner Brown Part 2450 Element 4256579 or 4125222 ×1

Trans-Clear 4 pieces

  • Brick 1 x 2 without Bottom Tube Trans-Clear Part 3065 Element 6514262 or 6244904 ×4

Trans-Green 4 pieces

  • Brick 1 x 2 without Bottom Tube Trans-Green Part 3065 Element 6514266 or 6244908 ×4

White 3 pieces

  • Plate 6 x 6 White Part 3958 Element 6552116 or 4144012 ×2
  • Wedge Plate 3 x 6 Cut Corners White Part 2419 Element 6552090 or 241901 ×1

Yellow 1 piece

  • Brick Round 1 x 1 Open Stud Yellow Part 3062b Element 306844 or 306224 ×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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