Posts made by dude8604

@chrizree Yeah, probably. And I guess it could just send the Gcode to start a print directly from the SD card in the printer. That should work without interfering with the print. I'll try that.

I've been testing this setup with my Prusa i3 MK3S, and I get really bad prints compared to printing directly. Looks like the layers are offset from one another and it's possibly overextruding. I don't know if it's the Omega2+/Octoprint setup (probably), or if there are some settings that aren't right. So it seems like the Omega2+ isn't powerful enough to run Octoprint. Probably have to spring for a Raspberry Pi. They say it doesn't work with the Raspberry Pi Zero W, so probably has to be one of the higher end ones. And the Omega2+ doesn't have anywhere near the specs.

Does anyone have suggestions on how to make it work? If not, then I don't think Octoprint works well enough with the Omega2.

Another note. If you don't do the last optional step, you can delete /rom/overlay/swap.page to save space

rm /rom/overlay/swap.page

@crispyoz I created a new thread https://community.onion.io/topic/4349/octoprint-1-5-2-3d-print-server-on-omega2

Re: Octoprint (3D print server) on Omega2+

I installed Octoprint 1.5.2 on an Omega2+ with the Mini Dock for USB and power. There are other ways to do this, like a few different Docks that would work, or you can do it with pins. But USB seems the simplest to me at least for my use.

The post I'm replying to explains how to do this with Octoprint 1.3.9 on an older Omega2+ firmware, I don't know which version. I wanted to do it with the latest version (1.5.2) and firmware (Ω-ware: 0.3.2 b233), and I was able to do it with a few tweaks. For completeness I'll post the whole procedure. I'm writing this from memory, I didn't take notes on the specific things I did differently so let me know if you have problems.

I made changes to config files using the Code Editor app through the web interface. The previous instructions use vi, which to me seems more difficult. Ok, here goes.

This assumes you have gone through the initial setup wizard, have a microSD card in the slot on the Omega (I think 2GB is enough but I'm not positive), and have a way to connect your 3D printer to the Omega (USB is simplest).

1. Change the package repository

In the file /etc/opkg/distfeeds.conf, uncomment these two lines (probably lines 2 and 5):

src/gz openwrt_base http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/mipsel_24kc/base
src/gz openwrt_packages http://downloads.openwrt.org/releases/18.06-SNAPSHOT/packages/mipsel_24kc/packages

run

opkg update

2. Format and mount SD card

opkg install fdisk e2fsprogs block-mount

umount /dev/mmcblk0p1
mkfs.ext4 /dev/mmcblk0p1
umount /dev/mmcblk0p1
mkdir /mnt/SD
mount /dev/mmcblk0p1 /mnt/SD

(will get some error like can’t umount, just ignore it)

3. Copy OS to SD card

tar -C /overlay -cvf - . | tar -C /mnt/SD/ -xf - 
umount /mnt/SD

block detect > /etc/config/fstab

4. Auto mount SD card on system boot

In the file /etc/config/fstab,

change the option: target '/mnt/mmcblk0p1' to option: target '/overlay'
change the option: enabled '0' to option enabled ‘1'

reboot

after rebooting you can verify if /overlay is mounted properly by running

df -h

You should see something like

Filesystem                Size      Used Available Use% Mounted on
/dev/root                 7.8M      7.8M         0 100% /rom
tmpfs                    60.9M    124.0K     60.8M   0% /tmp
/dev/mmcblk0p1           14.5G      1.3G     12.4G  10% /rom/overlay
overlayfs:/overlay       14.5G      1.3G     12.4G  10% /
tmpfs                   512.0K         0    512.0K   0% /dev

Except your used and free space will be different.

5. Set up swap space and expand /tmp

opkg install swap-utils

create swap file on SD card

dd if=/dev/zero of=/rom/overlay/swap.page bs=1M count=512

This will take a few minutes

mkswap /rom/overlay/swap.page
swapon /rom/overlay/swap.page

To check

free

should look like

             total       used       free     shared    buffers     cached
Mem:        124808      96724      28084        132       5444      15564
-/+ buffers/cache:      75716      49092
Swap:      1048572          0    1048572

expand /tmp

mount -o remount,size=200M /tmp

5. Install C++ and Python (I chose Python 3 because Python 2 is being phased out)

opkg update
opkg install gcc make 
opkg install python3 python3-pip unzip
opkg install python3-dev --force-overwrite

pip3 install --upgrade pip
pip3 install --upgrade setuptools

7. Download and install Octoprint

cd /root
wget https://github.com/foosel/OctoPrint/archive/1.5.2.zip
unzip 1.5.2.zip
cd OctoPrint-1.5.2

ln -s /usr/bin/gcc /usr/bin/ccache_cc

Install (this will take a while)

pip install -r requirements.txt

Fix some file/folder names for compatibility

sed -i 's/Häußge/H\./g' /root/OctoPrint-1.5.2/src/octoprint/util/comm.py
sed -i 's/Häußge/H\./g' /root/OctoPrint-1.5.2/src/octoprint/util/virtual.py
sed -i 's/Häußge/H\./g' /root/OctoPrint-1.5.2/src/octoprint/plugins/virtual_printer/virtual.py

sed -i 's/exit("You should not run OctoPrint as root!")/pass/g' /root/OctoPrint-1.5.2/src/octoprint/server/__init__.py

8. Run Octoprint Server

octoprint serve --iknowwhatimdoing &

Wait several minutes for server to start
Use browser to connect

http://omega-[your id].local:5000

Go through the setup wizard and change settings as needed for your printer

You might want to update Octoprint and/or install some plug-ins. Future updates might not work, so you risk messing up your Octoprint install, do so at your own risk. Same goes for plug-ins, some of them might not install on the Omega2 or break something, but the ones I tried worked fine.

9. Set to automatically start Octoprint on boot

In the file /etc/rc.local, add this right above the exit line

octoprint serve --iknowwhatimdoing

or, for debugging purposes, to log Octoprint's console output, instead add

octoprint serve --iknowwhatimdoing >> /tmp/output.txt 2>&1 & 

If you want to be able to update, or possibly to install certain plugins, you might want to use the swap file and expand /tmp. I don't know if this has any performance implications or if there's some reason not to, I'm still a beginner with Linux, but I have some experience. If you want to do this, in the same file /etc/rc.local, add the following above the Octoprint line

### activate the swap file on the SD card
swapon /rom/overlay/swap.page

### expand /tmp space
mount -o remount,size=200M /tmp

And that's it! Happy printing!

Let me know if you have any problems or questions or comments.

I got Octoprint 1.5.1 to work with my Omega2+. Instructions are basically the same as @Ming-Chou-Cheng wrote, but I had to change some minor things. I'll post details if anyone is interested, let me know.

@Daniel-Kalwitzki Did you get this working? What version of Octoprint?