API · /filament-api

Filament Calculator API

healthy 4,651 Subscribers

3D-printing filament maths as an API, computed locally and deterministically. The length-weight endpoint converts between the length and the weight of a spool of filament from its diameter (1.75 mm or 2.85 mm) and material density, using weight = (π/4·d²·length)·density — so one metre of 1.75 mm PLA weighs about 2.98 g, a standard 1 kg PLA spool holds roughly 335 m, and the same weight of the lighter ABS gives about 400 m. The cost endpoint computes the filament cost of a print from the weight or length used and the price per kilogram, and the spool-remaining endpoint turns a remaining-weight measurement (weigh the spool, subtract the empty-spool weight) into the remaining length so you know whether a job will finish. Built-in densities cover PLA, ABS, PETG, TPU, nylon, ASA, PC, HIPS, PVA, wood-fill and carbon-fibre blends, or supply your own. Diameters are in millimetres, lengths in metres and weights in grams. Everything is computed locally and deterministically, so it is instant and private. Ideal for 3D-printing, maker, print-farm, slicer-plugin, prototyping and STEM-education app developers, filament-usage and print-cost tools, and workshop software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is filament geometry and cost; for tank or material volume use a volume API.

#filament #3d-printing #maker #print-cost #spool #developer-tools

api.oanor.com/filament-api

Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/filament-api/openapi.json

/api/filament-api/llms.txt

Discovery: GET /api/index.json lists every API.

Filament Calculator API — live data on the oanor API marketplace

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 76 ms; Server probes · 24h
Subscribers: 4,651; active
Total calls: 80; last 7 days

Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

7,800 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
7,800 calls/month
2 req/sec
Length/weight + cost + spool remaining
No credit card

Starter

€4.10 /month

78,000 calls / month
6 requests / second
Hard cap (429 above quota, no overage)
78,000 calls/month
6 req/sec
11 materials, custom density, 2.85 mm
Email support

Pro

€11.20 /month

340,000 calls / month
15 requests / second
Hard cap (429 above quota, no overage)
340,000 calls/month
15 req/sec
Print-farm & slicer-plugin pipelines
Priority support

Mega

€35.00 /month

1,800,000 calls / month
40 requests / second
Hard cap (429 above quota, no overage)
1,800,000 calls/month
40 req/sec
Platform scale
Dedicated SLA

Built by

PremiumApi

Related APIs

Other APIs with overlapping tags.

Stepper Motor API

Stepper-motor motion maths as an API, computed locally and deterministically — the steps-per-millimetre and speed numbers a 3D-printer, CNC or robotics builder configures a machine with. The leadscrew endpoint gives the steps per mm for a lead-screw or ball-screw axis: (motor steps per revolution × microstepping) ÷ the screw lead, so a 1.8° motor (200 steps) at 16 microsteps on an 8 mm-lead screw is 400 steps/mm with 2.5 µm of resolution — the value that goes straight into the firmware. The belt endpoint does the same for a belt-and-pulley axis, where the travel per motor turn is the pulley teeth × the belt pitch (GT2 belt = 2 mm), so a 20-tooth GT2 pulley gives the classic 80 steps/mm of a 3D-printer X/Y axis, and shows the speed-versus-precision trade of a bigger pulley. The speed endpoint turns a steps-per-mm and a step pulse rate into the axis speed in mm/s and mm/min — at 80 steps/mm a 40 kHz step rate is 500 mm/s, though the real limit is the motor stalling at high step rates and the controller pulse ceiling. It also notes that microstepping adds smoothness, not true accuracy, since torque per microstep falls. Everything is computed locally and deterministically, so it is instant and private. Ideal for 3D-printer and CNC firmware setup, motion-control and robotics tools, and maker calculators. Pure local computation — no key, no third-party service, instant. Ideal-geometry estimates — leave a margin below the theoretical top speed. 3 compute endpoints. For CNC surface finish use a CNC-finish API; for gear ratios a gear-ratio API.

api.oanor.com/steppermotor-api

Fret Spacing API

Fretted-instrument lutherie maths as an API, computed locally and deterministically — the fret positions a guitar, bass, mandolin or ukulele builder slots a fingerboard to. This is instrument-building geometry, not music theory. The positions endpoint lays out a whole fingerboard from the scale length using the twelve-tone equal-temperament rule: the distance from the nut to fret n = scale length × (1 − 1 ÷ 2^(n/12)), so the 12th fret lands at exactly half the scale (the octave) and each gap shrinks by the constant ratio 2^(1/12) ≈ 1.0595 toward the bridge — a 25.5-inch Fender scale puts fret 1 at 1.431 inches and fret 12 at 12.75. The fret endpoint gives one fret’s distance from the nut, from the previous fret and to the bridge; the scalelength endpoint runs it backwards, recovering the scale length from a measured distance to a known fret (measure to the 12th and double it). It works in inches or millimetres — 25.5 Fender, 24.75 Gibson, 25.4 classical, 34 bass. Everything is computed locally and deterministically, so it is instant and private. Ideal for lutherie, guitar-building, instrument-design and maker app developers, fingerboard-slotting and fret-calculator tools, and CAD/CNC templates. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. For note names or frequencies use a music-theory API.

api.oanor.com/fretspacing-api

Paracord API

Paracord-craft maths as an API, computed locally and deterministically — the cord-length numbers a paracord crafter cuts a project to. The bracelet endpoint sizes the cord from the finished length and the weave using the well-known rule of thumb — about a foot of cord per inch of work for a cobra (Solomon) bar, double that for a king cobra, less for a fishtail — so an 8-inch cobra bracelet takes around 9 feet of cord including a foot of waste for the tails; give it a wrist measurement instead and it adds the fit ease and the buckle to get the finished length first, so a 7-inch wrist comes out near 10 feet. The weave endpoint generalises it to any project — lanyards, belts, dog leashes — as cord = finished length × cord-per-inch × the number of working strands, with the weave factors built in or your own cord-per-inch, and answers in inches, feet and metres. Everything is computed locally and deterministically, so it is instant and private. Ideal for paracord, survival-gear, scouting, craft and maker app developers, project-estimator and cut-list tools, and DIY software. Pure local computation — no key, no third-party service, instant. Rules of thumb — cut long and trim. Live, nothing stored. 2 compute endpoints.

api.oanor.com/paracord-api

Chainmaille API

Chainmaille maths as an API, computed locally and deterministically — the aspect-ratio and ring numbers a maille artist weaves to. The aspect endpoint computes the all-important Aspect Ratio = inner diameter ÷ wire diameter, and solves for whichever of the three you are missing, then lists the weaves that ring will make: AR, not absolute size, decides everything — too low and the rings won’t close through each other, too high and the weave goes floppy, so a 6.4 mm ID on 1.6 mm wire is AR 4.0, good for European 4-in-1, Byzantine, box chain and more. The ring endpoint does the material maths: wire per ring ≈ π × (inner diameter + wire diameter) — the mean-diameter circumference — so those AR-4 rings take about 25 mm of wire each and weigh roughly 0.4 g in steel; pass a wire length to get how many rings it yields, or a ring count to get the total wire and weight, in any of nine metals from aluminium to silver. Everything is computed locally and deterministically, so it is instant and private. Ideal for chainmaille, jewelry, cosplay-armour and maker app developers, ring-buying and project-estimator tools, and craft software. Pure local computation — no key, no third-party service, instant. Dimensions in mm. Live, nothing stored. 2 compute endpoints. For wire-gauge ↔ mm use a wire-gauge API.

api.oanor.com/chainmaille-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Filament Calculator API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Filament Calculator API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Filament Calculator API?

Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.

How much does Filament Calculator API cost?

Filament Calculator API has a free tier with 100 calls / month. Paid plans start at €4.10 / month with higher quotas and faster rate limits.

Can I cancel my subscription anytime?

Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.

Is Filament Calculator API GDPR-compliant?

All requests to Filament Calculator API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Filament 3

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/cost

Print cost

Playground

Parameters

Custom headers

Language: Client:

GET /v1/length-weight

Length ↔ weight

Playground

Parameters

Custom headers

Language: Client:

GET /v1/spool-remaining

Remaining spool length

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Spec

Playground

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/filament-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/filament-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/filament-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);

import requests
r = requests.get(
    "https://api.oanor.com/filament-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

Ratings

No reviews yet.

Discussion

Ask questions, share usage tips, get answers from the provider and other developers. Public — anyone can read.

New thread

📌 Pinned 🔒 Locked

· ·

🔒 This thread is locked — no new replies.

No threads yet — start the discussion.

Support

Private 1:1 support with the provider — billing questions, integration issues, account problems. Only you and the provider team can see these threads.

Open new ticket

Describe what you need help with. The provider team gets an email and replies on the ticket page.

No tickets yet for this API.

Subscription active — calls can start immediately.

Send your first request —

Subscription active — copy a snippet and fire off your first call.

Pick a key

Plaintext is shown once at creation — use the prefix as a reminder.

Filament Calculator API

API health

Pricing

Built by

Related APIs

Stepper Motor API

Fret Spacing API

Paracord API

Chainmaille API

Frequently asked questions

Parameters

Parameters

Parameters

Code snippets

Ratings

Discussion

New thread

📌 🔒

Support

Open new ticket

Your cookie choices