# Two machines cannot be used at the same time **URL:** \ **Category:** General Discussion\ **Created:** [May 15, 2022, 1:39pm UTC](https://klipper.discourse.group/t/two-machines-cannot-be-used-at-the-same-time/2899 "2022-05-15T13:39:53Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Cloud2702](https://avatars.discourse-cdn.com/v4/letter/c/97f17d/32.png) [@Cloud2702](https://klipper.discourse.group/u/Cloud2702)\ **Post date:** [May 15, 2022, 1:39pm UTC](https://klipper.discourse.group/t/two-machines-cannot-be-used-at-the-same-time/2899/1 "2022-05-15T13:39:53Z")
![3](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/d/d81b1c7f7710efe1a770af53d864c69552c80388.png) Machine A is in use, but machine B reports an error, even after restarting FIRMWARE machine A will report an error (Failed automated reset of MCU ‘opi’), how to solve it? ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [May 15, 2022, 2:52pm UTC](https://klipper.discourse.group/t/two-machines-cannot-be-used-at-the-same-time/2899/2 "2022-05-15T14:52:10Z")
Hello @Cloud2702 ! Can you explain? You want to control two printers with one Klipper installation on the host (RasPi) at the same time?? ---
**Author:** ![Cloud2702](https://avatars.discourse-cdn.com/v4/letter/c/97f17d/32.png) [@Cloud2702](https://klipper.discourse.group/u/Cloud2702)\ **Post date:** [May 15, 2022, 3:06pm UTC](https://klipper.discourse.group/t/two-machines-cannot-be-used-at-the-same-time/2899/3 "2022-05-15T15:06:33Z")
Yes, that’s what I meant, the official website of fluidd told me to ask here, but kiauh assistant installed klipper and moonraker when installed 2, according to you mean can’t control two or more machines at the same time? ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [May 15, 2022, 3:21pm UTC](https://klipper.discourse.group/t/two-machines-cannot-be-used-at-the-same-time/2899/4 "2022-05-15T15:21:36Z")
You can not even control two different printers with one Klipper installation without changing the printer.cfg every time when you swap the printer. The Klipper firmware part on the printer and the Klipper part on the Pi is to be seen as one unit. The part on the Pi does the calculations, the part on the printer does the driving of the hardware. Moonraker is like OctoPrint or Fluid the frontend to control Klipper. You have to use another Pi. Maybe it’s possible to install another instance of Moonraker/Klipper on the Pi. ---
**Author:** ![Cloud2702](https://avatars.discourse-cdn.com/v4/letter/c/97f17d/32.png) [@Cloud2702](https://klipper.discourse.group/u/Cloud2702)\ **Post date:** [May 15, 2022, 3:41pm UTC](https://klipper.discourse.group/t/two-machines-cannot-be-used-at-the-same-time/2899/5 "2022-05-15T15:41:39Z")
So, what you mean by host (RasPi) is generally one host (RasPi) to one machine, which also means one to one, but there is no way to add another host (RasPi) to one machine for two or more machines, right? ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [May 15, 2022, 4:00pm UTC](https://klipper.discourse.group/t/two-machines-cannot-be-used-at-the-same-time/2899/6 "2022-05-15T16:00:30Z")
You need to run separate instances of Klipper. See [Frequently Asked Questions - Klipper documentation](https://www.klipper3d.org/FAQ.html#can-i-run-multiple-instances-of-klipper-on-the-same-host-machine) ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [September 29, 2025, 3:43pm UTC](https://klipper.discourse.group/t/two-machines-cannot-be-used-at-the-same-time/2899/7 "2025-09-29T15:43:55Z")
Closed on September 29, 2025, 3:43pm UTC