Pinouts, not guesses
Every breakout is photographed, pinned and checked against the vendor drawing before it reaches the index.
Open hardware supply
BOM
Shelter
The parts counter for open hardware, and a shelter for its bills of materials. Indexed projects, verified BOMs, every part in one box.
Component Index
All 51 parts
Shop by bench
Complete Builds
All eight kits
Kits with a complete BOM
BOM Import
Import the BOM.
Import the BOM.
Skip the six tabs.
Paste a bill of materials, a CSV from KiCad, or a line from a build guide. We match it against verified stock, flag what needs a human, and put the whole thing in one cart.
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Paste or drop a BOMReference designators, quantities and vague descriptions are all supported.
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Review the matchesFuzzy matches are clearly marked, not hidden. Swap any line for an alternative.
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Send it to the sheetOne cart, one box, one shipping line. Export the matched BOM as CSV.
| Qty | Component / Line item | Status | Price |
|---|---|---|---|
| 2× | NEMA 17 stepper, 0.9° | Matched | $27.00 |
| 2× | TMC2209 stepper driver | Matched | $9.80 |
| 1× | ESP32-S3 DevKit | Matched | $11.50 |
| 1× | GT2 belt + pulley set | Matched | $8.20 |
| 1× | MGN12H rail, 300 mm | Matched | $18.40 |
| 4× | M3 socket head, 12 mm | Review | $4.80 |
| 1× | 0.96″ OLED I²C display | Matched | $5.90 |
13 of 14 lines matched · 1 substitution offered
Subtotal: $123.50
Open Hardware Ecosystem
All 76 projects
From the field index
Ranked by community, documentation, maturity and hardware availability.Where to buy the parts · Engineering stack
Sourcing Assurance
How we check
Sourcing, with receipts
Licenses travel with the BOM
Each kit states its hardware license and what that means for a derivative, a classroom or a small run.
Substitutions with reasons
Out of stock does not mean stuck. See the drop-in, the close-enough, and exactly what changes.
Stock that is actually stock
Counts refresh from the shelf, not from a distributor's optimistic CSV. Backorders say so.
Weekly Bench Notes
Have a project that deserves better sourcing?
Send us the repository or the BOM. If it is open, we will index it, check the parts, and tell you what does not add up. One useful email a week, no spam.