# LEGO 3803-1 — Robotics Invention System Upgrade Kit (1.5) (1999)

Source: https://www.brickmissing.com/sets/3803-1-robotics-invention-system-upgrade-kit-15
Publisher: BrickMissing (https://www.brickmissing.com) — free LEGO parts checker. Not affiliated with the LEGO Group.

LEGO RCX 3803-1 Robotics Invention System Upgrade Kit (1.5) focuses on Robotics Invention System Upgrade Kit (1.5) as a buildable character or creature. Recognition comes from pose, face, silhouette and details that carry the subject's personality. That gives the model presence on the shelf.

## Set facts

- Set number: 3803-1
- Name: Robotics Invention System Upgrade Kit (1.5)
- Theme: Mindstorms › 1.0
- Released: 1999
- Pieces: 70
- Distinct part + colour lots: 25
- Build difficulty: beginner
- Repairability: 4.0% of this set's lots are hard to replace (1 of 25 part+colour combinations appear in three or fewer sets in the entire LEGO catalog).

## Complete parts list (25 lots, 70 pieces)

Prices are the official LEGO Pick a Brick price per individual part, where LEGO publishes one.

| Qty | Part | Colour | Part no. | LEGO element ID | LEGO price each |
| ---: | --- | --- | --- | --- | --- |
| 8 | Plate 2 x 2 Corner | Light Gray | 2420 | 242002 | — |
| 2 | Plate Special 2 x 2 with 2 Pin Holes | Light Gray | 2817 | 281702 | — |
| 2 | Technic Beam 1 x 5 Thin | Light Gray | 32017 | 4106885 | — |
| 2 | Technic Axle and Pin Connector Angled #2 - 180° | Black | 32034 | 6484676 | €0,11 |
| 4 | Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] | Black | 32054 | 3205423 | — |
| 4 | Technic Beam 3 x 3 L-Shape Thin | Light Gray | 32056 | 4111941 | — |
| 2 | Technic Axle 2 Notched | Black | 32062 | 4109810 | €0,07 |
| 4 | Technic Beam 1 x 7 Thin | Black | 32065 | 6271573 | €0,28 |
| 2 | Technic Axle 5 | Black | 32073 | 4114740 | — |
| 3 | Technic Bush 1/2 Smooth with Axle Hole Reduced | Tan | 32123a | 4206210 | — |
| 4 | Technic Modular Connector | Trans-Dark Blue | 32137 | 4118978 | — |
| 2 | Technic Pin Double with Axle Hole | Yellow | 32138 | 4119438 | — |
| 2 | Technic Beam 2 x 4 L-Shape Thick | Black | 32140 | 6271825 | €0,15 |
| 4 | Technic Axle 4 | Black | 3705 | 370526 | €0,08 |
| 2 | Technic Axle 6 | Black | 3706 | 370626 | €0,12 |
| 1 | Technic Axle 8 | Black | 3707 | 370726 | €0,22 |
| 8 | Technic Axle and Pin Connector Perpendicular | Light Gray | 6536 | 4173667 | — |
| 2 | Technic Axle Connector Ridged [with x Hole x Orientation] | Light Gray | 6538b | 4100408 | — |
| 2 | Technic Beam 1 x 9 Bent (6 - 4) Thick | Black | 6629 | 6279881 | €0,34 |
| 2 | Technic Beam 1 x 3 Thin | Light Gray | 6632 | 4107825 | — |
| 2 | Rubber Band Small 13mm (Square Cross Section) | Black | 71509 | 4107153 | — |
| 1 | Sticker Sheet for Sets 3803-1,9732-1 | Unknown | 72047 | 4112924 | — |
| 1 | Technic Gear 24 Tooth Clutch with Dark Gray or Light Gray Center | White | 76019 | 4270486 | — |
| 2 | Rubber Belt Small [15mm ID] [Round Cross Section] | White | 85543 | 4544140 | €2,84 |
| 2 | Technic Rubber Belt Medium [26mm ID] [Round Cross Section] | Black | 85545 | 4286126 | — |

## Notes

- Track which of these parts you own and see what is missing: https://www.brickmissing.com/sets/3803-1-robotics-invention-system-upgrade-kit-15
- Inventory data is based on official LEGO inventories via the Rebrickable catalog, updated daily.
- Part images, minifigure lists and related sets are on the set page: https://www.brickmissing.com/sets/3803-1-robotics-invention-system-upgrade-kit-15