THE SPOOL LISTFREE MAKER TOOLS

Free tools for making things.

Check a model, price a part, pick a material — instantly, in your browser, no signup. Built for makers and the people who hire them.

RUNS 100% ON YOUR DEVICE · NOTHING UPLOADED

Need it made?

Post the job free — local makers quote, and you choose who makes it.

Got the machine? Sell your time on The Spool List. Join as a maker

3D Printing
LIVE

STL Checker

Drop in an STL and see if it's printable — watertight, manifold, and bed-fit checks with a 3D defect view.

LIVE

Cost Estimator

Ballpark what a part costs to fabricate — by process, material, size and quantity — then get real quotes.

LIVE

Material Selector

Answer a few questions about your part and get the right material and process, with the tradeoffs spelled out.

LIVE

Filament Calculator

Convert between grams, length and cost for any filament — and check what's left on a partial spool.

CNC Machining
LIVE

Feeds & Speeds

Spindle RPM, feed rate and removal rate for milling and routing, with material presets. Metric or imperial.

LIVE

Tap & Drill Chart

Tap drill sizes, thread pitch and clearance holes — metric and imperial, M2 to M20 plus UNC/UNF.

LIVE

Thread Pitch Chart

Pitch, pitch and minor diameters and stress area for ISO metric, UNC and UNF threads.

LIVE

Gear Generator

Involute spur gears to spec — module, teeth, pressure angle, bore — with a live preview and SVG download.

SOON

Fits & Tolerances

ISO shaft/hole fits (H7/g6 and friends) with clearance and interference.

Sheet Metal
LIVE

Bend Allowance

Bend allowance, deduction and flat-blank length with K-factor presets. The core sheet-metal calc.

SOON

Press Brake Tonnage

Bending force by material, thickness and V-die width.

LIVE

Gauge Chart

Sheet gauge to inches and mm for steel, galvanized, stainless and aluminium, with weight per m².

Metalwork & General Fabrication
LIVE

Material Weight

Weight of any stock — plate, bar, tube, square, hex — across metals, plastics and wood.

LIVE

Cut-List Optimizer

Pack cuts onto the fewest stock lengths and see the waste — bar, board, tube or extrusion, kerf included.

SOON

Weld Strength

Fillet weld throat and load capacity.

Laser Cutting
LIVE

Laser Cost & Kerf

Estimate cut time and cost from toolpath length, and dial in kerf compensation for press-fit parts.

LIVE

Living Hinge Generator

Tune a staggered slit pattern, preview it live, and download a laser-ready SVG that makes rigid sheet bend.

SOON

Finger-Joint Box

Dimensions in, laser-ready box panels out as SVG.

Casting & Molding
LIVE

Mold & Resin Volume

How much silicone or resin to mix, two-part ratios by weight or volume, and shrinkage compensation.

SOON

Injection vs Print

Break-even quantity between molding tooling and printing per-unit.

Electronics / PCB
LIVE

Trace Width & LED Resistor

IPC-2221 trace width for a given current, and the LED series resistor with nearest standard value.

SOON

Impedance & Color Code

Microstrip impedance and resistor color-code decoder.

Textiles & Apparel
LIVE

Fabric Yardage & Embroidery

Estimate fabric yardage for your pieces and price an embroidery job by stitch count.

SOON

Screen-Print & HTV

Per-garment screen-print costing and vinyl sizing.

More markets — coming soon
WOOD

Board Foot & Sag

Lumber volume and cost, plus shelf-sag/span deflection.

LASER

Finger-Joint Box

Dimensions in, laser-ready box panels out as SVG.

SHEET

Press Brake Tonnage

Bending force by material, thickness and die width.

3DP

Print Defect Diagnoser

Describe what went wrong with a print and get the likely cause and fix.

Need it actually made?

Every tool here connects to The Spool List — a marketplace of verified makers across 3D printing, CNC, laser cutting and more. Your payment is protected until you confirm delivery, so the maker is only paid for work you're happy with. Get quotes →