PWM fan with EEB · Issue #2104 · MarlinFirmware/Marlin · GitHub
Reprap Ramps1.4 RRD Fan Extender - Geeetech Wiki
Marlin 2.0 Fan PWM frequency too low
Expanding SKR 1.4 fan PWM controllers?
How-To: Modify Marlin to control a laser with an SKR Pro - SKR Boards - V1 Engineering Forum
Finding proper PWM pin on Octopus V1.1 for neje laser : r/BIGTREETECH
BUG] SKR 1.3 Fans not runing while printing · Issue #15199 · MarlinFirmware/ Marlin · GitHub
BIGTREETECH - ✨ Hey! We wanna let you know we have another version! 🙈 The Manta - M4P motherboard is 𝐅𝐑𝐄𝐒𝐇! ✓ Supports both Klipper and Marlin ✓ 3 PWM fan ports