My SV0 thermistor wires broke.
Shipping from Sovol is very costly.
What is alternative thermistor or whole hotend that I can “plug and Play”?..TZ?
TIA
You need a PT1000 sensor to make your Zero happy. Unfortunately the pullup resistor soldered on the toolhead board pretty much makes that the only viable choice.
Finding a PT1000 that will fit into that tiny hole in the heat block is difficult.
This MIGHT work but you may have to replace the connector. Be sure to select the “bare” version.
https://www.aliexpress.us/item/1005009094110026.html
CORRECTION
EDIT 4/6/26: The posting below is in error, the Sales Department was responding to an inquiry about the SV06 “ACE”, not the Sovol Zero.
==================== BELOW IS NOT RELEVANT TO THIS TOPIC =================
Sovol After Sales Department advised:
Specifications: 100K±1%, 3950K±1%, thermistor D1.8 glass head, PT3-25E2-S2, L=70mm
1 Like
@sovol3d Please clarify.
@JohnPoole ask your contact to check his source!
According to the official Sovol Github repository the Zero has the following in printer.cfg:
[extruder]
step_pin: extruder_mcu:PA8
dir_pin: extruder_mcu:PA9
enable_pin: !extruder_mcu: PA11
rotation_distance: 6.5
microsteps: 16
full_steps_per_rotation: 200
nozzle_diameter: 0.400
filament_diameter: 1.75
max_extrude_only_distance: 150
max_extrude_cross_section: 60
heater_pin: extruder_mcu:PB7
sensor_type: my_thermistor_e
pullup_resistor: 11500
sensor_pin: extruder_mcu:PA5
min_temp: 0
max_temp: 355
max_power: 1.0
min_extrude_temp: 150
control : pid
pid_kp : 34.838
pid_ki : 4.976
pid_kd : 62.823
pressure_advance: 0.025
pressure_advance_smooth_time: 0.025
Source - Zero Github
The 11500 Ohm pullup resistor SOLDERED to the toolhead board is a horrible mismatch for 100K thermistor and will result is very poor temperature resolution above 240 °C.
The Zero does still use a 100K thermistor w/4700 pullup for BED temperature.
AFAIK all Sovol printers PRIOR to the Zero have a 4700 Ohm pullup for the extruder thermistor and work well with a 100k thermistor.
@cardoc My error: my inquiry to Sovol concerned the SV06 “ACE” which I purchased in March 2026, not the zero. I did not consider carefully the model disparity. Mea culpa. I’ll see if I can edit/discard my prior post in the topic so it is not considered.
Thank you for the follow-up and correction.
Well in researching this I discovered the origonal SV08 has a 100K thermistor with an 11500 pullup… With a 12 bit A2D converter in the MCU that means by 260 °C accuracy of ±3 °C is “good enough”
So in a pinch a Zero or Max COULD use an old school thermistor if you are not running super hot extrusion temps. Be sure to update the sensor type in printer.cfg.