Maker tools

Small calculators for the questions that come up mid-build. Nothing to download, nothing to sign up for — open one on your phone at the bench and use it.

• Resistor colour codeRead a resistor's value straight off its coloured bands. 4-band and 5-band.
• LED resistor calculatorSupply voltage and LED forward voltage in, the resistor you need to buy out.
• Wire gauge & voltage dropCurrent and run length in, a safe AWG size and the voltage you'll lose over the run.
• 3D print cost estimatorFilament weight, print time and your rates in, a price to charge or budget out.
• Unit converterLength, weight, volume and temperature — metric and imperial, either direction.
• Ohm's law calculatorVoltage, current, resistance, power — fill in any two, get the other two.
• Find a makerspacePick a city or state — see a CoMakers space nearby if there is one, and search the wider web either way.
• Import landed costA supplier's price in dollars in, what the machine actually costs to get into your workshop out — freight, duty, VAT, levies, clearing and haulage.
• G-code generator (laser)Laser-cutting G-code from a rectangle, circle, hole grid, or your own SVG's actual paths.
• G-code generator (lathe)Turning G-code for a stepped or tapered shaft, a spherical end, and grooves.
• G-code cheatsheetWhat every common G-code and M-code actually does, in plain English.
• 3D print troubleshootingStringing, warping, layer separation and more — causes, and what to fix before the next print.
• Print settings by materialStarting nozzle and bed temps, speed and cooling for PLA, PETG, ABS, ASA, TPU and Nylon.