Printers that show backpowering issues try to draw their 5v power from devices connected via USB. In the case of a connected Raspberry Pi, that can cause undervoltage issues and thus negatively affect stability and performance - we've seen crashing Pis, vanishing WiFi and so on. There's a simple fix that involves putting electric tape or otherwise disconnecting the 5v line in your USB connector.
Here's a list of printer models currently identified to exhibit this electrical design flaw in their stock electronics:
- Creality:
- CR-6 SE (apparently even seems to put 24v on the 5v pin for some?!)
- CR-10S Pro V2
- Ender 3 Pro (8-bit board)
- Ender 3 Pro V2
- Ender 5 Plus
- Ender 5 Pro
- Vivendo T-Rex 3
- Wanhao Duplicator i3 Plus/Monoprice Selector Plus/Cocoon Create
Please note: This list is not exhaustive. Just because your printer isn't listed here doesn't mean it has no backpowering issues, it just means nobody has yet tried and added their experiences here. So please test and update accordingly with your results to help others in the future, thanks