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 Beam 1 x 2 ThinBlack ×12Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 1 x 5 ThickBlack ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Technic Knob WheelBlack ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Axle 5Light Bluish GrayPart 32073Element 32073194 or 4211639×3
Technic Axle 7Light Bluish GrayPart 44294Element 44294194 or 4211805×1
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718173 spares in the box×8
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedLight Bluish GrayPart 32123bElement 6271165 or 42115732 spares in the box×7
Dark Bluish Gray
16 pieces
Technic Axle Connector 2 x 3 with Ball Socket, Open SidesDark Bluish GrayPart 32174Element 4217829×3
Technic Axle and Pin Connector 2 x 5 with Two Ball Joint SocketsDark Bluish GrayPart 47296Element 4217826×1
Technic Axle and Pin Connector 2 x 7 with Two Ball Joint SocketsDark Bluish GrayPart 50898Element 4242036×1
Technic Beam 1 x 2 ThinDark Bluish GrayPart 41677Element 6338422 or 4210980Also in Black×2
Technic Beam 1 x 4 ThinDark Bluish GrayPart 32449Element 6327561 or 4210749×2
Technic Beam 1 x 5 ThickDark Bluish GrayPart 32316Element 32316199 or 4210686Also in Black×1
Technic Knob WheelDark Bluish GrayPart 32072Element 32072199 or 4210854Also in Black×2
Technic Pin 3/4Dark Bluish GrayPart 32002Element 32002199 or 42110501 spare in the box×4
Blue
5 pieces
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×5
Trans-Neon Orange
2 pieces
Bar 1L with ClipTrans-Neon OrangePart 48729aElement 4252081×2
Glow In Dark Opaque
1 piece
Plate Round 1 x 1 with Solid StudGlow In Dark OpaquePart 6141Element 42523921 spare in the box×1
Yellow
1 piece
Large Figure Spinner Rod 2.5L with Gear 8 Tooth (Rhotuka)YellowPart 50903Element 4263698×1
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.