If you print too fast or with a hotend that is too cold you will get a decreased % flowrate and under extrusion problems. The encoder driver with Happy Hare updates a printer variable called printer['mmu_encoder mmu_encoder'].flow_rate with the % measured flowrate. Whilst it is ...
## PID tune [extruder] and [heater_bed] sections ## Fine tune E steps [extruder] section [mcu] ## Uncomment below if you're using the Raspberry uart0 to communicate with Spider #restart_method: command ## You need to select 'Communication interface' to USB in 'make menuconfig'...