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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.

Research Institute

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21110 Research Institute

152 pieces in 73 part and color combinations, plus 3 minifigures.

The piece count includes the 12 parts inside the set's minifigures, which this inventory lists separately. 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

White 75 pieces

  • Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small White Part 53451 Element 6270106 or 4568387 1 spare in the box ×6
  • Animal Body Part, Dog Bone [Short] White Part 93160 Element 6360202 or 4600294 1 spare in the box ×1
  • Arm Mechanical with Clip [Thick Support] White Part 98313 Element 6976864 or 6276864 ×2
  • Arm Skeleton [Bent / 2 Clips] White Part 93609 Element 6326680 or 6146086 1 spare in the box ×2
  • Bar 4L (Lightsaber Blade / Wand) White Part 30374 Element 6116602 or 4129836 ×2
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×1
  • Cone 1 x 1 [Top Groove] White Part 59900 Element 6601844 or 4518400 1 spare in the box ×1
  • Cupboard 2 x 3 Drawer White Part 4536 Element 4520636 or 4109736 ×2
  • Cupboard 2 x 3 x 2 Door White Part 4533 Element 4261470 or 4248214 ×1
  • Equipment Hose Nozzle / Gun with Side String Hole Simplified White Part 60849 Element 6468004 or 6101931 1 spare in the box ×2
  • Insect Body Part, Leg / Tail / Tentacle / Claw White Part 15064 Element 6359811 or 6310195 ×1
  • Panel 1 x 1 x 1 Corner White Part 6231 Element 6619293 or 623101 ×2
  • Panel 1 x 2 x 1 [Rounded Corners] White Part 4865b Element 6552161 or 6146215 ×1
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×1
  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 1 spare in the box Also in Trans-Clear ×8
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] White Part 2654 Element 6601843 or 6552259 ×1
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] White Part 4081b Element 6281990 or 4632566 ×2
  • Plate Special 1 x 2 Side Handle [Free Ends] White Part 2540 Element 4140583 or 254051 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) White Part 15573 Element 6550152 or 6051511 ×1
  • Plate Special 1 x 2 with Clip Horizontal on Side White Part 11476 Element 6313115 or 6070712 ×4
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] White Part 60470b Element 6347287 or 4556152 ×5
  • Plate Special 1 x 2 with Handle on End [Closed Ends] White Part 60478 Element 6552131 or 4515364 ×4
  • Plate Special 1 x 2, Top Clip [Split] White Part 92280 Element 4598527 ×2
  • Tile 1 x 1 with Groove White Part 3070b Element 6550138 or 307001 1 spare in the box ×16
  • Tile Special 1 x 1 with Clip with Rounded Edges White Part 15712 Element 6348055 or 6054551 ×6

Dark Bluish Gray 23 pieces

  • Brick Curved 1 x 2 x 1 1/3 with Curved Top Dark Bluish Gray Part 6091 Element 6411327 or 4210797 ×1
  • Equipment Binoculars Dark Bluish Gray Part 30162 Element 4587887 or 4211051 ×1
  • Equipment Sextant Dark Bluish Gray Part 30154 Element 6269999 or 4217675 ×1
  • Plate 2 x 2 Dark Bluish Gray Part 3022 Element 4211094 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Dark Bluish Gray Part 15573 Element 6092572 ×1
  • Tile 1 x 1 with Groove Dark Bluish Gray Part 3070b Element 4210848 2 spares in the box ×17
  • Tile 1 x 6 with Groove Dark Bluish Gray Part 6636 Element 4210651 ×1

Light Bluish Gray 17 pieces

  • Arm Mechanical with 2 Clips [Battle Droid] Light Bluish Gray Part 30377 Element 6319333 or 4211658 1 spare in the box ×1
  • Bar 3L Light Bluish Gray Part 87994 Element 6093527 or 6064033 1 spare in the box ×1
  • Brick Round 1 x 1 Open Stud Light Bluish Gray Part 3062b Element 4211412 ×1
  • Brick Special 1 x 1 with Stud on 1 Side Light Bluish Gray Part 87087 Element 4558953 ×1
  • Bucket 1 x 1 x 1 Light Bluish Gray Part 95343 Element 6057487 ×1
  • Cupboard 2 x 3 x 2 with Hollow Studs Light Bluish Gray Part 92410 Element 4610112 ×2
  • Dish 2 x 2 Inverted [Radar] Light Bluish Gray Part 4740 Element 4211512 ×1
  • Equipment Medical Syringe Light Bluish Gray Part 87989 Element 4563719 1 spare in the box ×2
  • Hinge Brick 2 x 2 Top Plate Thin Light Bluish Gray Part 6134 Element 4211881 ×1
  • Plate 6 x 6 Light Bluish Gray Part 3958 Element 4211474 ×3
  • Plate Round 1 x 1 with Solid Stud Light Bluish Gray Part 6141 Element 4211525 1 spare in the box ×1
  • Plate Special 1 x 2 Side Handle [Free Ends] Light Bluish Gray Part 2540 Element 4211632 ×1
  • Weapon Lightsaber Hilt with Bottom Ring Light Bluish Gray Part 64567 Element 4581155 or 4539481 1 spare in the box ×1

Reddish Brown 17 pieces

  • Bar 1L with Top Stud and Two Side Studs Reddish Brown Part 92690 Element 6029774 ×1
  • Bar 3L Reddish Brown Part 87994 Element 6428805 or 6075208 2 spares in the box ×2
  • Bar Holder with Clip Reddish Brown Part 11090 Element 6341968 or 6080355 ×2
  • Brick Sloped 45° 2 x 2 Reddish Brown Part 3039 Element 4211202 ×1
  • Dish 2 x 2 Inverted [Radar] Reddish Brown Part 4740 Element 4660435 or 4267996 ×2
  • Panel 1 x 2 x 2 [Side Supports / Hollow Studs] Reddish Brown Part 87552 Element 6064188 or 4618541 ×1
  • Plate 1 x 2 Reddish Brown Part 3023 Element 4211150 ×1
  • Plate 2 x 2 Reddish Brown Part 3022 Element 4613975 or 4216695 ×2
  • Plate 2 x 4 Reddish Brown Part 3020 Element 4211186 ×2
  • Plate Round 1 x 1 with Solid Stud Reddish Brown Part 6141 Element 4216581 1 spare in the box ×2
  • Tile 1 x 2 with Groove Reddish Brown Part 3069b Element 4211151 ×1

Trans-Clear 9 pieces

  • Brick Round 1 x 1 Open Stud Trans-Clear Part 3062b Element 6514232 or 6223655 ×1
  • Equipment Bottle Trans-Clear Part 95228 Element 6507876 or 6247369 ×2
  • Equipment Bottle / Erlenmeyer Flask with Trans-Bright Green Fluid Pattern Trans-Clear Part 93549pat0001 Element 6530023 or 6447576 ×1
  • Equipment Bottle / Erlenmeyer Flask with Trans-Purple Fluid Pattern Trans-Clear Part 93549pat0002 Element 6530024 or 6245206 ×1
  • Equipment Cup / Mug [Plain] Trans-Clear Part 3899 Element 6514013 or 6238856 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box Also in White ×1
  • Tile 1 x 2 with Groove Trans-Clear Part 3069b Element 6514223 or 6251294 ×1

Black 3 pieces

  • Equipment Magnifying Glass with Thick Frame, Solid Handle, Trans-Clear Lens Pattern Black Part 10830pat0001 Element 6012466 ×1
  • Hinge Brick 1 x 2 Base Black Part 3937 Element 393726 ×1
  • Plate Special 4 x 4, Studs on One Edge with Gemini, Auriga, Canis Minor, Taurus and Orion Constellations Print Black Part 6179pr0011 Element 6094164 ×1

Blue 3 pieces

  • Plate 1 x 1 Blue Part 3024 Element 302423 2 spares in the box ×2
  • Tile Round 1 x 1 Blue Part 98138 Element 6284575 or 6009460 1 spare in the box ×1

Dark Red 1 piece

  • Tile Round 1 x 1 Dark Red Part 98138 Element 6284585 or 6028132 1 spare in the box ×1

Flat Silver 1 piece

  • Tile Round 1 x 1 Flat Silver Part 98138 Element 6238890 or 4655241 1 spare in the box ×1

Orange 1 piece

  • Brick and Axle Separator v2.0 Orange Part 96874 Element 6240515 or 4654448 ×1

Trans-Brown 1 piece

  • Cone 1 x 1 [Top Groove] Trans-Brown Part 59900 Element 6514019 or 6301323 ×1

Trans-Yellow 1 piece

  • Plate Round 1 x 1 with Solid Stud Trans-Yellow Part 6141 Element 6514056 or 6240216 1 spare in the box ×1

Minifigures 3 figures

  • Dark Bluish Gray Torso, Dark Blue Legs, Bright Yellow Hair Minifigure, checked as a whole figure ×1
  • Medium Blue Torso, Dark Tan Legs, Dark Orange Hair Minifigure, checked as a whole figure ×1
  • White Torso Lab Coat, Light Bluish Grey Legs, Dark Brown Hair Minifigure, checked as a whole figure ×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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