Zero 2 W?  

RE: Perf

It should be very similar in perf to RPI3B+ which is great. Power usage is concern, likely it should still be fine. The board without USB devices connected should not take more than 200mW on Idle, and 500-600mW under load. I have one ordered will look how it behaves compared to RPI0W under DC supply.

The RP02W is already outdated (just 512MB of DDR2?), it is better, but still. It is slightly disappointing that it does not include `/ac` (just because of 5GHz) and much more modern USB-C connectors. I was eying for sometime at https://shop.allnetchina.cn/products/copy-of-radxa-zero?variant=39440872144998 as a significantly more beefy alternative (probably around 60-70% of perf of RPI4) that has `/ac`, and built-in `eMMC` at `2x` cost compared to `RPI02W`.

Anyway for MK3S+ for most it will be great change.

Let's try!

I ordered one as well, so I can test it and

• find out if the PrusaLink-Image 0.52 still boots and runs,
• find out about heat (should not be an issue at max 1W), and
• find out about power draw (maybe risk some reboots, we'll see).

Jeff Geerling already posted a HowTo on how to limit the number of cores in use in order to limit power draw (here). Perhaps 2 (or even 1) cores can do PrusaLink and run a CSI RPi-cam at the same time?

RE: Octoprint approved

FYI: Octoprint has confirmed that this is enough power to be run on the Zero 2 W:

https://twitter.com/OctoPrint3D/status/1453608862188249095

They also remind everyone to shut down the Zero 2 W first before killing power to the MK3:

https://twitter.com/OctoPrint3D/status/1453779551520182279

I wonder if it's fast enough so that PL doesn't have to slow down file uploads while printing now.

Not today

they plan on making 200k zero 2s this year. Good luck finding one. 

Crazy times, these are. 

in two days?

I found a small shop that claimed to have some "in stock", and I received a shipping confirmation in the evening. We'll see whether they really ship.

RE: Octoprint approved

Posted by: @balu

They also remind everyone to shut down the Zero 2 W first before killing power to the MK3:

https://twitter.com/OctoPrint3D/status/1453779551520182279

Interesting point. Linux filesystems should generally cope with power failures fine thanks to journaling. Better even if the process writing new files uses the proper syscalls etc. But then there's the flash translation layer in the SD card that's IMHO a much weaker link and can wreak some havoc.

But I wonder if PrusaLink does (or could) take advantage of the fact that MK3S can AFAIK detect power going away to prepare for resuming a print from SD card. In theory it could also communicate to the RPi to do a proper shutdown with the remaining power, or even support a print resuming from RPi?

Emergency remount

But I wonder if PrusaLink does (or could) take advantage of the fact that MK3S can AFAIK detect power going away to prepare for resuming a print from SD card. In theory it could also communicate to the RPi to do a proper shutdown with the remaining power, or even support a print resuming from RPi?

Maybe, but unlikely. You don't really have a lot of power budget left. What happens today is when the power goes off, the power detect sends a signal to board. This results in turn off of heaters, and save of state. This is mostly enough to do a quick sync of state. Maybe this could be received via UART by the Prusa Link, but then you really need to do a save, and filesystem sync and emergency remount. You would likely have 1s for all of that. Not a lot of time.

The better idea would be to have RPI powered from UPS to give it capacity to run for a minute. Send a signal to shutdown, and make it boot on power supply being ON.

Emergency remount will not solve corrupted FS problem: https://unix.stackexchange.com/questions/528724/emergency-remount-does-not-prevent-damaged-filesystem.

Zero 2

I have one prototype of the PI Zero 2 at home for about a week and yesterday I got another one from official distribution, so far everything works well.

RE: Zero 2 W?

I am happy to state that I simply moved the sd card from the zero W to the new zero W2 and it just worked right out the gate!

RE: Zero 2 W?

Yes, I can confirmed that too, it is just swap SD card and plug&play 😉 also booting of RPi Zero 2 W is much faster (75 vs 44 seconds)

Posted by: @dsk001

I am happy to state that I simply moved the sd card from the zero W to the new zero W2 and it just worked right out the gate!

 

RE: Zero 2 W?

Still pretty slow. I got down to 13s with Zero 2 W 🙂

RE: Zero 2 W?

How did you get it to 13s? Custom distro, but still running prusalink?

RE:

I get 13s running Klipper for MK3S+. However, PrusaLink should be faster to run (at least this was the outcome last time when tested). The general idea is the same:

1. Get a good A2-type SD card (good random I/O)

2. Optimise bootloader via `/boot/config.txt`

3. Optimize system via `systemd-analyze`, `systemd-analyze blame`, disable and configure to make it faster

Then you get something like this:

root@raspberrypi:~# systemd-analyze
Startup finished in 3.826s (kernel) + 10.948s (userspace) = 14.775s

RE: Zero 2 W?

Right before getting the beta invite I setup a Pi Zero 2 with Octoprint. It is Significantly faster than the original Pi Zero. I ended up with  canakit combo unit due to poor availability. 

I’m going to try PrusaLink as soon as I’m back home.

RE: Zero 2 W?

I'm running PrusaLink on a Zero 2 W via the gpio pins. Seems snappy, ran Octoprint just fine, seems like PrusaLink is going great too.

RE: Zero 2 W?

I didn't realise you could run octoprint on it. Will have to try that.  I like Prusa link but there are a few things that octoprint does that are missing from prusalink.

RE: Zero 2 W?

I also hop in to say that our Zero 2 W has no issues so far, used to run Octoprint but now moved into PrusaLink, though I cannot compare with an older generation.

RE: Zero 2 W?

Connect Pi Zero 2W in the same way as Pi Zero W?(According to this guide click)?

RE: Zero 2 W?

I don't understand, but I guess you meant to ask about the installation procedure and yes, it is the same for both the zero W and zero 2