Connection lost using 2 webcams on RPI 3B

General Discussion
1

Basic Information:

Printer Model: Creality CR-10 V2 with bltouch
MCU / Printer
klippy (1).log (3.3 MB)
board: atmega2560 / Printerboard: Creality 2.5.2
klippy.log

Describe your issue:

When running two webcams (Logitech C920 via USB + PiCam 2) on my RPI 3B with a Klipperscreen, the connection gets interrupted during printing. All runs well if I only use the PiCam2. Is the RPI hardware causing this propably?

2

Most probably you drawing too much current.
You can try to add external USB Hub with external power and connect cameras there.

3

Sometimes a hub helps.

General experience is that USB webcams can be (in fact, are) problematic in Klipper. Exact reason is unknown:

  • Too much current
  • Too high data rates
  • Other effects that causes timing issues on the USB bus

The effect is often depending on the camera model.