# Maker tools

- Human page: https://happytails.ai/en/maker-tools/
- Markdown: https://happytails.ai/en/maker-tools.md
- Structured JSON: https://happytails.ai/agents/en/maker-tools/index.json
- Visibility: public

## Page guide

Find the tool you need, then open it to get started.

## All maker tools

- [DPI calculator](https://happytails.ai/en/maker-tools/dpi-calculator/): Calculate pixel density from pixel count and physical size. ([Markdown](https://happytails.ai/en/maker-tools/dpi-calculator.md))

- [Image to STL](https://happytails.ai/en/maker-tools/image-to-stl/): Turn an image into a solid 3D relief. ([Markdown](https://happytails.ai/en/maker-tools/image-to-stl.md))

- [OBJ to STL](https://happytails.ai/en/maker-tools/obj-to-stl/): Triangulation, units and loss of materials/textures made explicit. ([Markdown](https://happytails.ai/en/maker-tools/obj-to-stl.md))

- [Ohms law](https://happytails.ai/en/maker-tools/ohms-law/): Calculate current and power from voltage and resistance. ([Markdown](https://happytails.ai/en/maker-tools/ohms-law.md))

- [Resistor color code](https://happytails.ai/en/maker-tools/resistor-color-code/): 4/5/6-band modes and tolerance. ([Markdown](https://happytails.ai/en/maker-tools/resistor-color-code.md))

- [STL to OBJ](https://happytails.ai/en/maker-tools/stl-to-obj/): Preserve mesh topology. ([Markdown](https://happytails.ai/en/maker-tools/stl-to-obj.md))

- [STL viewer](https://happytails.ai/en/maker-tools/stl-viewer/): Local mesh rendering, dimensions with chosen units and memory limits. ([Markdown](https://happytails.ai/en/maker-tools/stl-viewer.md))

## Check dimensions and geometry before fabrication

Maker utilities prepare models and dimensions for another application or machine. File conversion is only part of the workflow: scale, orientation and geometry can affect whether the result is usable.

## How to choose your next step

Preview dimensions, surface orientation and missing geometry in the destination application. Keep a known-size reference when a format does not encode units clearly.

## Common questions about maker tools

### Can a model look correct and still fail to print?

Yes. Open surfaces, thin walls, overlapping geometry and unsupported features can cause problems that are not obvious from one view.

### Does converting a mesh add detail?

No. A conversion does not recover geometry that was absent from the original. Check whether materials, textures and scene information are supported by the destination format.