Bill of Materials (BOM)
This page lists all non-printed components and printing consumables required to build one PrintExo unit. All custom structural parts are fabricated using 3D printing and are documented separately in the 3D Printing Guide.
1. Overview
PrintExo is designed to minimize sourcing complexity by:
- relying on standard, off-the-shelf components,
- avoiding custom machining or proprietary parts, and
- enabling regional substitution where possible.
The total hardware cost (excluding tools and the 3D printer) is approximately $359 per leg.
All listed components can be sourced from common online retailers or local suppliers.
All costs in this BOM are listed in U.S. dollars (USD).
2. Printing Consumables
3D-printed parts are not listed individually in this BOM. Instead, printing requirements are summarized as consumables.
| Item | Specification | Qty | Unit Cost | Example Source | Notes |
|---|---|---|---|---|---|
| P01 | PLA filament (1.0 kg) | 2 | $19.99 | Bambu Store | Any standard PLA filament is acceptable |
Note: Detailed part lists, orientations, and print settings are provided in the 3D Printing Guide.
3. Fasteners & Bearings
| Item | Specification | Qty | Unit Cost | Example Source | Notes |
|---|---|---|---|---|---|
| H01 | M3 bolt, 5 mm | 12 | $0.05 | MiSUMi | |
| H02 | M3 bolt, 12 mm | 8 | $0.05 | MiSUMi | |
| H03 | M3 bolt, 18 mm | 6 | $0.05 | MiSUMi | |
| H04 | M3 bolt, 20 mm | 8 | $0.05 | MiSUMi | |
| H05 | M3 bolt, 22 mm | 48 | $0.05 | MiSUMi | |
| H06 | M3 bolt, 40 mm | 4 | $0.05 | MiSUMi | |
| H07 | Bearing (HK0810) | 8 | $2.71 | MiSUMi | |
| H08 | M3 plastic washer (spacer) | 2 | $0.42 | MiSUMi |
Note: Unit costs are approximate, normalized estimates for budgeting consistency; actual prices vary by supplier and purchase volume.
4. Actuator
| Item | Specification | Qty | Unit Cost | Example Source | Notes |
|---|---|---|---|---|---|
| A01 | CubeMars AK60-6 V1.1 KV140 | 2 | $ 298.90 | CubeMars | One per leg, integrated driver |
Note: This BOM covers the exoskeleton hardware platform; electrical design and power supply configurations may vary by use case, so only the actuator is specified here.
5. Etcs
| Item | Specification | Qty | Unit Cost | Example Source | Notes |
|---|---|---|---|---|---|
| E01 | Calf compression sleeve | 2 | $ 16.99 | Amazon | One per leg |
| E02 | Shoe laces (auxiliary) | 2 | $ 10.00 | Amazon |
6. Tools Required (Non-consumable)
The following tools are commonly required for assembly but are not included in the BOM cost.
| Tool | Notes |
|---|---|
| Hex key set | M3 fasteners |
| Screwdrivers | General assembly |
| Hand drill | Hole cleanup / tapping |
| M3 tap | Recommended |
| Flush cutters | Support removal |
7. Substitutions & Alternatives
-
Fasteners and bearings:
Equivalent metric components may be substituted if dimensions match. -
Filament:
PETG or carbon-fiber–reinforced filaments are compatible but may require print setting adjustments.
When deviating from the reference configuration, verify mechanical fit and electrical compatibility.