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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.
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50 pieces in 29 part and color combinations.
LEGO counts 49 pieces. This inventory comes from a separate parts catalog and lists 50; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
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.
Plate Round Corner 4 x 4
Black ×1
Dark Bluish Gray ×1
Black is darker than Dark Bluish Gray.
LEGO's request form asks for the set number (40315) and each piece's element ID, both listed above.
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Brick 2 x 2
×3
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
×2
Plate 1 x 2
×2
Plate 1 x 6
×1
Plate 2 x 2
×1
Plate Round 1 x 1 with Solid Stud
×1
Tile Round 2 x 2 with Bottom Stud Holder
×10
Brick Sloped 33° 3 x 1
×2
Cone 1 x 1 [Top Groove]
×1
Plate 1 x 6
×1
Plate 2 x 2
×3
Plate 4 x 6
×1
Plate Round Corner 4 x 4
Also in Dark Bluish Gray
×1
Technic Beam 1 x 7 Thick
×1
Tile Round 1 x 1
×1
Brick Curved 4 x 1 Double, No Studs
×1
Brick Sloped 45° 2 x 1 with Bottom Pin
×2
Launcher, Brick Special 1 x 4 with Inside Clips (Disk Shooter) with Recessed Center 2 Studs
×1
Plate Round 6 x 6 with Hole
×1
Technic Pin 1/2 without Friction Ridges
×1
Brick 2 x 2
×3
Plate Round Corner 4 x 4
Also in Black
×1
Technic Brick 1 x 2 [1 Pin Hole]
×1
Tile Special 2 x 2 with Top Pin
×1
Brick 2 x 2
×3
Technic Axle 3 with Stud
×1
Plate Round Corner 4 x 4
×1
Plate Round Corner 4 x 4
×1
Tick each piece as you find it, or mark it missing.
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 LEGOMark 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.
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.
