Robot Inventor (51515): parts list and STL files

Set 51515, Robot Inventor, from 2020, has 949 pieces in 153 kinds of part and colour. Here is every part, with the ones you can 3D print at home and the ones to buy.

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Free: an STL file for every part you can print, the parts list and a BrickLink shopping list for the rest. Pro adds print-ready plates for a 256 mm bed and our printing guide. About ProYour Pro includes the print-ready plates.

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Robot Inventor, built (3D picture) — What it looks like built. A 3D picture, not a photo, made from the LDraw model by Philippe Hurbain (CC BY 2.0).

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899to print

50to buy

12spares

153kinds

899 to print, 50 to buy, 12 spares. Print: plain bricks, plates and beams you can make on a home 3D printer. Buy: clear, printed, rubber, electric and very thin parts, which are better ordered. Spares are the extras in the box.

Every part in set 51515

Parts in set 51515, Robot Inventor
Colour	Part	Qty	Print or buy
Black	2780 Pin with Friction Ridges Lengthwise and Center Slots	175	Print
Blue	6558 Pin Long with Friction Ridges Lengthwise, 2 Center Slots	82	Print
Blue	43093 Axle Pin with Friction Ridges Lengthwise	60	Print
Light Bluish Gray	3673 Pin without Friction Ridges Lengthwise	18	Print
White	65487 Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge]	18	Print
Dark Bluish Gray	11214 Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle	14	Print
Dark Turquoise	40490 Beam 1 x 9 Thick	14	Print
Reddish Brown	24316 Axle 3 with Stop	12	Print
Light Bluish Gray	32054 Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]	12	Print
Black	32526 Beam 3 x 5 L-Shape Thick	12	Print
Light Bluish Gray	65489 Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes)	12	Print
Black	32524 Beam 1 x 7 Thick	11	Print
Dark Turquoise	18654 Pin Connector Round 1L [Beam]	10	Print
White	18654 Pin Connector Round 1L [Beam]	10	Print
Red	32062 Axle 2 Notched	10	Print
Light Bluish Gray	32123b Bush 1/2 Smooth with Axle Hole Semi-Reduced	10	Print
Black	32523 Beam 1 x 3 Thick	10	Print
Light Bluish Gray	3713 Bush	10	Print
Light Bluish Gray	4274 Pin 1/2 without Friction Ridges	10	Print
Dark Turquoise	32316 Beam 1 x 5 Thick	9	Print
Black	32348 Beam 1 x 7 Bent (4 - 4) Thick	9	Print
Dark Turquoise	39793 Connector Beam 3 x 3	9	Print
Light Bluish Gray	4519 Axle 3	9	Print
Black	25214 Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end	8	Print
Black	32009 Beam 1 x 11.5 Double Bent Thick	8	Print
Black	32291 Axle and Pin Connector Perpendicular Double	8	Print
Dark Turquoise	32523 Beam 1 x 3 Thick	8	Print
Dark Turquoise	49283 Wire Clip with Axle Hole	8	Print
White	59443 Axle Connector Smooth [with x Hole + Orientation]	8	Print
Black	62462 Pin Connector Round [Slotted]	8	Print
Dark Turquoise	6536 Axle and Pin Connector Perpendicular	8	Print
Black	32316 Beam 1 x 5 Thick	7	Print
Black	32525 Beam 1 x 11 Thick	7	Print
Light Bluish Gray	63869 Axle and Pin Connector Perpendicular Triple	7	Print
Black	18654 Pin Connector Round 1L [Beam]	6	Print
Red	32054 Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]	6	Print
Dark Turquoise	32140 Beam 2 x 4 L-Shape Thick	6	Print
Black	32140 Beam 2 x 4 L-Shape Thick	6	Print
Light Bluish Gray	32184 Axle and Pin Connector Perpendicular 3L with Centre Pin Hole	6	Print
White	32192 Axle and Pin Connector Angled #4 - 135°	6	Print
Dark Turquoise	32526 Beam 3 x 5 L-Shape Thick	6	Print
Tan	32556 Pin Long without Friction Ridges	6	Print
Tan	3749 Axle Pin without Friction Ridges Lengthwise	6	Print
Dark Turquoise	60484 Beam 3 x 3 T-Shape Thick	6	Print
Tan	6589 Gear 12 Tooth Bevel	6	Print
Dark Bluish Gray	87083 Axle 4 with Stop	6	Print
White	32013 Axle and Pin Connector Angled #1	5	Print
Black	32278 Beam 1 x 15 Thick	5	Print
White	41239 Beam 1 x 13 Thick	5	Print
Black	64179 Beam Frame 5 x 7 with 3 x 5 Opening Thick	5	Print
Black	11478 Beam 1 x 5 Thin with Axle Holes on Ends	4	Print
Tan	18575 Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]	4	Print
Black	22961 Pin Connector Hub with 1 Axle	4	Print
Yellow	32073 Axle 5	4	Print
Black	32270 Gear 12 Tooth Double Bevel	4	Print
Black	32271 Beam 1 x 9 Bent (7 - 3) Thick	4	Print
Black	32557 Pin Connector Perpendicular Long	4	Print
Black	3705 Axle 4	4	Print
Black	41678 Axle and Pin Connector Perpendicular Double Split	4	Print
Dark Turquoise	42003 Axle and Pin Connector Perpendicular 3L with 2 Pin Holes	4	Print
Light Bluish Gray	44294 Axle 7	4	Print
Light Bluish Gray	44874 Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes]	4	Print
Light Bluish Gray	49130 Pin Connector Hub Perpendicular 3 x 3 Bent with 4 Pins (Pin Ridges Along Part)	4	Print
Dark Bluish Gray	55013 Axle 8 with Stop	4	Print
White	64782 Panel 5 x 11 x 1	4	Print
Light Bluish Gray	65098 Pin Double with Axle Hole - Squared Holes	4	Print
Black	66906 Pin with Friction Ridges Lengthwise and Towball - Round Pin Hole	4	Print
Black	42135 Axle Connector with Axle Hole [Reinforced]	3	Print
White	60483 Beam 1 x 2 Thick with Pin Hole and Axle Hole	3	Print
White	62531 Panel Curved 11 x 3 with 2 Pin Holes through Panel Surface	3	Print
White	64393 Panel Fairing #6 Long Smooth, Side B	3	Print
White	64681 Panel Fairing #5 Long Smooth, Side A	3	Print
Black	10197 Pin Connector Hub with 2 Perpendicular Axles	2	Print
Dark Bluish Gray	10928 Gear 8 Tooth [Reinforced]	2	Print
White	11946 Panel Fairing #21 5L Small Smooth, Side B	2	Print
White	11947 Panel Fairing #22 5L Small Smooth, Side A	2	Print
Light Bluish Gray	14720 Beam 3 x 5 Thick [90° Offset Centre Beam Holes]	2	Print
White	15458 Panel 3 x 11 x 1	2	Print
Reddish Brown	15462 Axle 5 with Stop	2	Print
White	24116 Panel Curved and Bent 6 x 3	2	Print
White	24119 Panel Curved 7 x 3 with 2 Pin Holes through Panel Surface	2	Print
Light Bluish Gray	2476a Plate Special 2 x 2 with Pin on Bottom	2	Print
Dark Turquoise	3069b Tile 1 x 2 with Groove	2	Print
Black	3069b Tile 1 x 2 with Groove	2	Print
White	32015 Axle and Pin Connector Angled #5 - 112.5°	2	Print
Black	32184 Axle and Pin Connector Perpendicular 3L with Centre Pin Hole	2	Print
Dark Turquoise	32474 Ball Joint	2	Print
White	32523 Beam 1 x 3 Thick	2	Print
Green	32523 Beam 1 x 3 Thick	2	Print
Yellow	32523 Beam 1 x 3 Thick	2	Print
Red	32523 Beam 1 x 3 Thick	2	Print
Blue	32523 Beam 1 x 3 Thick	2	Print
Dark Bluish Gray	3648b Gear 24 Tooth [New Style with Single Axle Hole]	2	Print
Red	3706 Axle 6	2	Print
Black	3707 Axle 8	2	Print
Black	3708 Axle 12	2	Print
Black	39790 Beam Frame 11 x 15	2	Print
Black	39794 Beam Frame 7 x 11	2	Print
Black	4162 Tile 1 x 8 with Groove	2	Print
White	46882 Panel Car Mudguard 15 x 2 x 7	2	Print
Dark Bluish Gray	59426 Axle 5.5 with Stop [Rounded Short End]	2	Print
Black	60483 Beam 1 x 2 Thick with Pin Hole and Axle Hole	2	Print
Yellow	60485 Axle 9	2	Print
White	64391 Panel Fairing # 4 Small Smooth Long, Side B	2	Print
White	64683 Panel Fairing # 3 Small Smooth Long, Side A	2	Print
Black	6636 Tile 1 x 6 with Groove	2	Print
White	87080 Panel Fairing #1 Small Smooth Short, Side A	2	Print
White	87086 Panel Fairing #2 Small Smooth Short, Side B	2	Print
Light Bluish Gray	98989 Axle and Pin Connector Perpendicular Double 4L	2	Print
Tan	99008 Axle 4 with Centre Stop	2	Print
Light Bluish Gray	99009 Turntable Small Top	2	Print
Black	99010 Turntable Small Base, 28 Tooth	2	Print
Light Bluish Gray	18939 Turntable Large Type 3 Base	1	Print
White	18948 Driving Ring Connector	1	Print
Black	32014 Axle and Pin Connector Angled #6 - 90°	1	Print
White	32034 Axle and Pin Connector Angled #2 - 180°	1	Print
Black	32498 Gear 36 Tooth Double Bevel	1	Print
White	32524 Beam 1 x 7 Thick	1	Print
Dark Turquoise	39369 Base Frame 11 x 19	1	Print
Dark Turquoise	3961 Dish 8 x 8 Inverted [Radar], Solid Studs, Rounded Anti-stud Underside	1	Print
Red	41250 Ball, Hard Plastic, 51mm (approx. 6 studs diameter)	1	Print
White	44375b Dish 6 x 6 Inverted (Radar) with Solid Studs	1	Print
Red	65413 Differential Gear - 28 Tooth with Round Axle Hole	1	Print
Light Bluish Gray	65414 Differential Gear House	1	Print
Dark Turquoise	87079 Tile 2 x 4 with Groove	1	Print
Black	2780 Pin with Friction Ridges Lengthwise and Center Slots	5 spare	Print
Black	18654 Pin Connector Round 1L [Beam]	1 spare	Print
Dark Turquoise	18654 Pin Connector Round 1L [Beam]	1 spare	Print
White	18654 Pin Connector Round 1L [Beam]	1 spare	Print
Light Bluish Gray	32123b Bush 1/2 Smooth with Axle Hole Semi-Reduced	1 spare	Print
Light Bluish Gray	3673 Pin without Friction Ridges Lengthwise	1 spare	Print
Light Bluish Gray	3713 Bush	1 spare	Print
Light Bluish Gray	4274 Pin 1/2 without Friction Ridges	1 spare	Print
Black	39367pat0002 Wheel 57 x 14 with 4 Spokes with 2 Holes and Black Integral Tire	6	Buy
Black	98585 Large Figure Weapon, Barrel with 2 Pin Holes and 3 Axle Holes	6	Buy
Black	45590 Axle Connector Double Flexible [Rubber]	4	Buy
Light Bluish Gray	54696 Motor, Medium Servo SPIKE	4	Buy
Black	55889 Wheel 18 x 14 with Pin Hole	4	Buy
White	56903 Wheel 18 x 8 with Fake Bolts and Shallow Spokes and Axle Hole	4	Buy
Black	61254 Tyre Offset Tread with Center Band 23 x 7	4	Buy
Black	2569 Antenna 8H Whip	2	Buy
Light Bluish Gray	46537 Projectile, Arrow with Shaft, Hollow Black Rubber End	2	Buy
Dark Bluish Gray	49743c01 Launcher, Brick Special 2 x 6 Spring Shooter with Light Bluish Gray Top	2	Buy
Light Bluish Gray	75c08 Hose Rigid 3mm D. 8L / 6.4cm	2	Buy
White	85543 Rubber Belt Small [15mm ID] [Round Cross Section]	2	Buy
White	37308 Sensor, Color, SPIKE	1	Buy
White	37316 Sensor, Distance, SPIKE	1	Buy
White	39881 Cable, USB, SPIKE / Mindstorms Robot Inventor	1	Buy
Red	54821 Projectile, Large Figure Weapon, Zamor Sphere / Ball	1	Buy
Dark Turquoise	67704 Battery Pack, Rechargeable, Mindstorms Robot Inventor	1	Buy
Dark Turquoise	67718 Hub, Programmable, Mindstorms Robot Inventor	1	Buy
[No Color/Any Color]	73229 Sticker Sheet for Set 51515-1	1	Buy
Black	88738 Turntable Large Type 4 Top, 60 Tooth	1	Buy

Print set 51515 at home

The set tool makes an STL file for each of the 899 printable pieces, sorted by colour, plus a shopping list for the 50 to buy. Free, no account, and it runs on your own phone or computer.

Get the free print files

Pro adds print-ready plates for a 256 mm bed. About Pro

Parts data: Rebrickable, and it can differ slightly from your box. Part shapes: LDraw Parts Library (CC BY 4.0). Browse all sets. Independent project, not sponsored, authorised or endorsed by any brick company.