the one above doesn't have working parameter, this one's fixed.
also, add [respond] to your printer.cfg, or M118 isn't gonna work.

[respond]
#default_type: echo
# Sets the default prefix of the "M118" and "RESPOND" output to one
# of the following:
# echo: "echo: " (This is the default)
# command: "// "
# error: "!! "
#default_prefix: echo:
# Directly sets the default prefix. If present, this value will
# override the "default_type".

[gcode_macro START_DRYER]
gcode:
{% set TIME_PARAM = params.TIME|default(3)|float %}
{% set TEMP_PARAM = params.TEMP|default(50)|float %}
M140 S{TEMP_PARAM} ; non blocking bed temp
SET_GCODE_VARIABLE MACRO=DRYER_STATE VARIABLE=time_remain_var VALUE={TIME_PARAM}
SET_GCODE_VARIABLE MACRO=DRYER_STATE VARIABLE=bed_temp_var VALUE={TEMP_PARAM}
UPDATE_DELAYED_GCODE ID=DRYER_TIMER DURATION=1
;SET_IDLE_TIMEOUT ;called w/o param and dont even need? cause timer tick reset temp anyway?

[gcode_macro STOP_DRYER]
gcode:
; Turn off heaters etc. here
M140 S0 ; Disable bed heater
SET_GCODE_VARIABLE MACRO=DRYER_STATE VARIABLE=time_remain_var VALUE=0
UPDATE_DELAYED_GCODE ID=DRYER_TIMER DURATION=0 ; Stop the timer.
M118 Drying Stopped

[gcode_macro DRYER_STATE]
variable_time_remain_var: 0
variable_bed_temp_var: 0
gcode:
{% if time_remain_var > 0 %}
M140 S{bed_temp_var} ; Reset bed temp (prevents timeout)
SET_GCODE_VARIABLE MACRO=DRYER_STATE VARIABLE=time_remain_var VALUE={time_remain_var - 1}
M118 Drying {time_remain_var}
{% else %}
STOP_DRYER
{% endif %}

[delayed_gcode DRYER_TIMER]
gcode:
UPDATE_DELAYED_GCODE ID=DRYER_TIMER DURATION=1
DRYER_STATE

;flip filament every 6h
[gcode_macro DRY_PLA]
gcode:
START_DRYER temp=55 time=43200
[gcode_macro DRY_PETG]
gcode:
START_DRYER temp=65 time=43200
[gcode_macro DRY_ABS]
gcode:
START_DRYER temp=80 time=43200
[gcode_macro DRY_WarmRoom]
gcode:
START_DRYER temp=100 time=43200

Thanks for posting the update. I think Klipper changed the syntax for accessing parameter values some time back, which accounts for the errors. I've just updated the Gist with my current working version which should work now. It's interesting to see other people's variations and additions though.

I was bored so I improved the macro a bit.
https://github.com/leadustin/QIDI-up2date-english/tree/main/dryer

Guys

I am using btt octopus board with rasbperry pi 5.

I run code with GPT a little under 6 times and now no erroes

[gcode_macro START_DRYER]
gcode:
{% set TIME_PARAM = params.TIME|default(3)|float %}
{% set TEMP_PARAM = params.TEMP|default(50)|float %}
M140 S{TEMP_PARAM} ; Set non-blocking bed temp
SET_GCODE_VARIABLE MACRO=DRYER_STATE VARIABLE=time_remain_var VALUE={TIME_PARAM}
SET_GCODE_VARIABLE MACRO=DRYER_STATE VARIABLE=bed_temp_var VALUE={TEMP_PARAM}
UPDATE_DELAYED_GCODE ID=DRYER_TIMER DURATION=1

[gcode_macro STOP_DRYER]
gcode:
M140 S0 ; Disable bed heater
SET_GCODE_VARIABLE MACRO=DRYER_STATE VARIABLE=time_remain_var VALUE=0
UPDATE_DELAYED_GCODE ID=DRYER_TIMER DURATION=0 ; Stop the timer
M118 Drying Stopped

[gcode_macro DRYER_STATE]
variable_time_remain_var: 0
variable_bed_temp_var: 0
gcode:
{% if time_remain_var > 0 %}
M140 S{bed_temp_var} ; Reset bed temp (prevents timeout)
SET_GCODE_VARIABLE MACRO=DRYER_STATE VARIABLE=time_remain_var VALUE={time_remain_var - 1}
M118 Drying {time_remain_var}
{% else %}
STOP_DRYER
{% endif %}

[delayed_gcode DRYER_TIMER]
gcode:
UPDATE_DELAYED_GCODE ID=DRYER_TIMER DURATION=1
DRYER_STATE

[gcode_macro DRY_PLA]
gcode:
START_DRYER temp=55 time=43200

[gcode_macro DRY_PETG]
gcode:
START_DRYER temp=65 time=43200

[gcode_macro DRY_ABS]
gcode:
START_DRYER temp=80 time=43200

[gcode_macro DRY_WarmRoom]
gcode:
START_DRYER temp=100 time=43200

akash191095 version works for me, running current git klipper etc... as of 3 august 2025

Nice macro set, but I wanted a better display on the timer, so I used this:

{% if time_remaining > 0 %}
        M140 S{bed_temperature} ; Reset bed temperature (prevents timeout)
        SET_GCODE_VARIABLE MACRO=DRYER_STATUS VARIABLE=time_remaining VALUE={time_remaining - 1}
        {% set hours_remaining = time_remaining // 3600 %}
        {% set minutes_remaining = (time_remaining % 3600) // 60 %}
        {% set seconds_remaining = time_remaining % 60 %}

        M117 Drying {hours_remaining}:{minutes_remaining}:{seconds_remaining}
    {% else %}
        STOP_DRYER
    {% endif %}