Thanks, Bar, for the constructive feedback! It’s really encouraging to see how you and the community are dedicated to improving the Maslow (amazing work building this community! 
).
The log for the “unable to extend” issue is quite short and doesn’t show any warnings or errors:
Serial Messages
Index.html Version: 0.87
[MSG:INFO: Channel auto report interval set to 50 ms]
[MSG:INFO: FluidNC v0.87 (Maslow-Main-ec171155-dirty)]
[MSG:INFO: Compiled with ESP32 SDK:v4.4.7-dirty]
[MSG:INFO: Local filesystem type is littlefs]
[MSG:INFO: Configuration file:maslow.yaml]
[MSG:INFO: Machine Maslow S3 Board]
[MSG:INFO: Board Maslow]
[MSG:INFO: UART1 Tx:gpio.1 Rx:gpio.2 RTS:NO_PIN Baud:115200]
[MSG:INFO: SPI SCK:gpio.12 MOSI:gpio.11 MISO:gpio.13]
[MSG:INFO: SD Card cs_pin:gpio.10 detect:NO_PIN freq:8000000]
[MSG:INFO: Stepping:Timed Pulse:4us Dsbl Delay:0us Dir Delay:0us Idle Delay:240ms]
[MSG:INFO: Axis count 3]
[MSG:INFO: Axis X (-2438.400,0.000)]
[MSG:INFO: Motor0]
[MSG:INFO: Axis Y (-1219.200,0.000)]
[MSG:INFO: Motor0]
[MSG:INFO: Axis Z (-100.000,0.000)]
[MSG:INFO: Motor0]
[MSG:INFO: tmc_2209 UART1 Addr:0 Step:gpio.15 Dir:gpio.16 Disable:NO_PIN R:0.110]
[MSG:INFO: Motor1]
[MSG:INFO: tmc_2209 UART1 Addr:1 Step:gpio.46 Dir:gpio.38 Disable:NO_PIN R:0.110]
[MSG:INFO: Z Axis driver test passed]
[MSG:INFO: Z2 Axis driver test passed]
[MSG:INFO: Kinematic system: Cartesian]
[MSG:INFO: Using spindle NoSpindle]
[MSG:INFO: Connecting to STA SSID:Maslow4_Belkin]
[MSG:INFO: Connecting.]
[MSG:INFO: Connecting..]
[MSG:INFO: No SSID]
[MSG:INFO: AP SSID maslow IP 192.168.0.1 mask 255.255.255.0 channel 1]
[MSG:INFO: AP started]
[MSG:INFO: WiFi on]
[MSG:INFO: Captive Portal Started]
[MSG:INFO: HTTP started on port 80]
[MSG:INFO: Telnet started on port 23]
[MSG:INFO: Caution: Unlocked]
[MSG:INFO: Extending all belts]
[MSG:ERR: Please press Retract All before using Extend All]
[MSG:INFO: Retracting all belts]
[MSG:INFO: Top Left pulled tight with offset -8.836]
[MSG:INFO: Top Right pulled tight with offset -6.044]
[MSG:INFO: Bottom Right pulled tight with offset -0.011]
[MSG:INFO: Bottom Left pulled tight with offset 0.000]
[MSG:INFO: Extending all belts]
The encoder connectors (UTP cables) have all been cleaned with compressed air and glued into place.
In response to your reply in my original thread (Unable to jog after calibration - #2 by bar), my next step was to perform a new calibration, but that led to this post (connection troubles, unable to extend).
There are multiple issues (see the list in the previous post) that might be related or caused by the same underlying problem. Let’s tackle them one by one, starting with the “extend all” issue, since it’s currently blocking further tests.
I’ll focus on the Setup → Test and repeat the retract/extend steps a few times. I’ll get back to you with any findings.