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.
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.
Technic Axle and Pin Connector Angled #2 - 180°Black ×3Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Technic Beam 1 x 7 Thick with Alternating HolesBlack ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector PerpendicularYellowPart 6536Element 6261367 or 4173666×4
Technic Pin Connector Round 1L [Beam]YellowPart 18654Element 64314811 spare in the box×2
Tan
24 pieces
Technic Axle 4 with Centre StopTanPart 99008Element 4666999×2
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×8
Technic Ball JointTanPart 32474Element 6488494 or 6097508×8
Technic Pin 3/4TanPart 32002Element 6663097 or 60139381 spare in the box×2
Technic Pin Long without Friction Ridges, with Anti-Roll NotchTanPart 39888Element 6321305×4
Dark Blue
17 pieces
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]Dark BluePart 3660Element 6025375 or 4590785×1
Tile 1 x 4 with Solar Panels PrintDark BluePart 2431pr0115Element 6215341×16
Reddish Brown
8 pieces
Technic Axle 3 with StopReddish BrownPart 24316Element 6135494×6
Technic Axle 5 with StopReddish BrownPart 15462Element 6159763×2
Lime
4 pieces
Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls]LimePart 42195Element 6335185×4
Opal Trans-Purple
4 pieces
Rock 1 x 1 Crystal 5 PointOpal Trans-PurplePart 30385Element 6507866 or 6442192×4
Trans-Dark Blue
2 pieces
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]Trans-Dark BluePart 2654Element 6581774 or 6171732×2
[No Color/Any Color]
1 piece
Sticker Sheet for Set 42211-1[No Color/Any Color]Part 10110655Element 6522707×1
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.
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.