Is is safe to use wall smart plug to power ON/OFF MK4S? - General discussion, announcements and releases https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/ Prusa3D Forum Discussion Board en-US Sun, 10 May 2026 10:58:46 +0000 wpForo 60 RE: Is is safe to use wall smart plug to power ON/OFF MK4S? https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749815 Tue, 13 May 2025 18:47:49 +0000 I have smart plug and Home Assistant too.

The printer switches off after temperatures drop, but only if set to do so. I also automatically start air purifier with some filament types.

Btw., the printer is rather power hungry, when in idle...

]]> General discussion, announcements and releases strjan https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749815 RE: Is is safe to use wall smart plug to power ON/OFF MK4S? https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749593 Mon, 12 May 2025 07:27:01 +0000 Like the OP, I also only print occasionally. As the power switch is hard to get to in my setup, I tend to switch leave the PSU switch on, and then switch the actual printer on/off from the plug. I do, however, wait after a print job. Long enough so that all the fans have stopped cooling etc - only then do I switch the printer off (from the plug). This is no different to switch the unit on/off from its own PSU power switch. 

]]> General discussion, announcements and releases iftibashir https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749593 RE: Is is safe to use wall smart plug to power ON/OFF MK4S? https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749533 Sun, 11 May 2025 11:18:18 +0000  

Posted by: @walter-layher

Filesystem corruption can only happen during a write operation on the drive. If the printer is idle there is no risk for that. It makes no difference if you use an external switch to cut off power or the switch on the power supply, provided the printer is idle when you do this. This is not a computer with an operating system that needs a proper shutdown.

 Makes sense, and I cant recall ever corrupting a thumb drive.

]]> General discussion, announcements and releases andhson https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749533 RE: Is is safe to use wall smart plug to power ON/OFF MK4S? https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749529 Sun, 11 May 2025 11:06:10 +0000 Filesystem corruption can only happen during a write operation on the drive. If the printer is idle there is no risk for that. It makes no difference if you use an external switch to cut off power or the switch on the power supply, provided the printer is idle when you do this. This is not a computer with an operating system that needs a proper shutdown.

]]> General discussion, announcements and releases Walter Layher https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749529 RE: Is is safe to use wall smart plug to power ON/OFF MK4S? https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749527 Sun, 11 May 2025 10:56:57 +0000 I have a similar situation with my printer in another building, I use a smart plug together Prusa connect to check temperature before I switch off the try to leave the printer in a ready state for the next print to be able to turn on and print, that works if t correct filament and nozzle is in the machine which is not always the case. The only thing beyond watching temperatures that I heard of is the off chance to corrupt the thumb drive by just cutting power, that has not happened to me yet.

]]> General discussion, announcements and releases andhson https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749527 RE: https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749505 Sun, 11 May 2025 06:30:54 +0000 A smart plug has been working fine for me also. 

]]> General discussion, announcements and releases Steve https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749505 RE: Is is safe to use wall smart plug to power ON/OFF MK4S? https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749470 Sat, 10 May 2025 18:18:20 +0000 I have been doing that for years with my printers. Smart plugs flashed with Tasmota firmware, you can control/automate those via Home Assistant and/or OctoPrint. You should just wait a few minutes after the print job is finished and the nozzle has been  cooled down by the hotend fan before you switch the printer off. Otherwise the hot nozzle might lead to heat creep deforming the plastic parts in the extruder.

]]> General discussion, announcements and releases Walter Layher https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749470 Is is safe to use wall smart plug to power ON/OFF MK4S? https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749458 Sat, 10 May 2025 16:40:33 +0000 My MK4S printer is in the basement. I typically keep it OFF and switch ON only when I need to print something. I'm not a frequent user so printer is OFF for days at the time. When I design something to print, I have to run to the basement only to switch the printer ON and then run back upstairs to my computer to upload the gcode file and print it. This is inconvenient. However, I also own several smart wall plugs that I can switch wall power ON remotely from my phone. So the question is: Is is safe to have MK4S plugged into the smart wall plug with printer switch always set to ON and control it ON/OFF state using smart wall plug? Is the printer own switch just cutting power supply or it has some form of electronic spike protection and it would not be smart then to cut the power to the printer? Can someone knowledgeable give me some guidance here? 

]]> General discussion, announcements and releases JAM59 https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-general-discussion-announcements-and-releases/is-is-safe-to-use-wall-smart-plug-to-power-on-off-mk4s/#post-749458