Conducted a search of gear configuations matching the below requirements:
- Minimum module of 1mm
- Maximum outer diameter of 55mm (ring dedenum plus a 1mm wall)
- All meshing gears co-prime
- Module values must be terminating decimals
- Planetary gears must be similar size (planet addendums equal, ring dedendums equal, or somewhere between)
- At least 11 teeth on all gears (minimise undercut)
- Minimum of 4 planets (6 planet options indicated)
Found 7 gear configurations, 6 of which permit driving via sun gear in addition to planet carrier. (>=12 tooth options highlighted)