if V3.3 and gnd connection or other pin，it will die，so, if I have a breakout board ,and add a PPTC Resettable Fuse in the breakout board 3.3v , will have help?

@dc42 Thank you your reply, I change them

this is a breakout board for duet 2 wifi , Can THERMISTOR , ENDSTOP use one GND ?

and this breakout board can use for Duet3?

@gtj0 how about use a GT2 Idler Pulley without teeth？

@Phaedrux Thank you very much !
I have updated it ,it is work good,thank you : )

@Phaedrux Thank you very much for your patience, as a newbie, I am very lucky.
I will have try update them.

@Phaedrux thank you your reply

Firmware Name: RepRapFirmware for Duet WiFi and Duet Ethernet
Firmware Electronics: Duet WiFi 1.02 or later
Firmware Version: 1.21RC2 (2018-02-15 build 2)
WiFi Server Version: 1.21RC2
Web Interface Version: 1.22.6

maybe because this ajax cannot return true data?

it will keep loading
and the cpu will >90%

use 24V Duet2 Wifi only vin led is blue,duet not work
and use usb ,it work

it is new ,i don't konw what happend
somebody can help me?