Let me present the options for generating animated sprites for your Factorio mod:

1. Stable Video Diffusion

• Can generate short video sequences
• However, it's not specifically optimized for sprite-sheet or game asset creation
• The results might need post-processing to be usable as game sprites

2. Stable Diffusion with ControlNet Animation

• Can create frame-by-frame animations
• Better control over the style and consistency
• Requires more technical setup
• Free to use with open source licenses

3. AnimatedDiff

• Open source tool built on Stable Diffusion
• Specifically designed for creating short animations
• Can maintain consistency between frames
• Free to use

4. saifs.ai

• A specialized AI image generation platform
• Can be used as a starting point for creating individual frames
• You'll need to create multiple frames and combine them for animation

For your Factorio mod, I would suggest a combined approach:

1. Generate initial building designs using one of these tools
2. Use animation-specific tools for creating the movement frames
3. Post-process to match Factorio's style

This workflow would give you:

• High-quality base images
• Consistent animation frames
• Full control over the final look and feel
• No legal limitations on usage

Would you like more specific details about using any of these tools or setting up the workflow?