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[[File:Ql820nwb.png|400px|Ql820nwb.png]]

Notes for Fablab Label Printer installation

The following installation is needed for the Fablab Material Management App. The App sends a JSON-File with the label data to a Raspberry Pi which then prints a label using the QL-820NWB Labelprinter.

== 1. Installation of Printer-Server ==

- Install Raspberry PI OS Lite (no desktop needed) on Raspberry<br/> - sudo raspi-config (Enable SSH, set wirless password)

1.1 Raspberyy&nbsp;PrinterServer for Brother Label Printers

Step-by-step:
<pre>sudo apt install p910nd
sudo nano /etc/default/p910nd
</pre>
<div>Edit file p910nd:</div> <pre># Printer number, if not 0
P910ND_NUM=""

# Additional daemon arguments, see man 8 p910nd
P910ND_OPTS="-f /dev/usb/lp0"

# Debian specific (set to 1 to enable start by default)
P910ND_START=1</pre>

Start service:
<pre>systemctl restart p910nd.service</pre>

Check this [https://www.splitbrain.org/blog/2020-08/18-raspberry_print_server_for_brother_ql-500_label_printer_no_cups web-site ]for necessary settings in Windows / MacOS<br/> Main steps are:

#Install correct Brother Driver for your operating system 
#Add a printer using TCP/IP address 
#Un-check Query printer 
#Select Customer, Protocol Raw, Port Number 9100&nbsp; 



=== 1.2 Python Print Server for JSON Files ===
<pre>sudo apt update
sudo apt install python3-pil python3-flask python3-qrcode
sudo apt install python3-pip
sudo pip install brother_ql</pre>

Extend Path-variable with /home/pi/.local/bin (sudo nano /etc/profile)

Grant user access right to USB-port:
<pre>sudo usermod -aG lp pi</pre>

Restart Raspberry:
<pre>sudo shutdown -r now </pre>

If you have a label-printer connected via USB, check unique ID of Brother Printer on USB-Port:
<pre>brother_ql -b pyusb discover (Should be something like: usb://0x04f9:0x209b)</pre>

For printers with WLAN, just set-up the WLAN Infrastructure setting on the printer (Network & Password) and reserver the printers IP - Address in your router. The IP-Address needs to be corrected in the attached Python-program.

Copy Arial Font-File arial.ttf in home-directory
<pre>wget https://www.freefontspro.com/d/14454/arial.zip
unzip arial.zip</pre>

Generate or copy python-file (s.a. attached file [[Media:WL_BrotherLabelPrinterServer.zip|WL_BrotherLabelPrinterServer.py]])<br/> Make sue the unique ID is correct in the program in line "subprocess.run....."
<pre>wget http://wiki.zurich.fablab.ch/Datei:WL_BrotherLabelPrinterServer.zip
unzip WL_BrotherLabelPrinterServer.zip
</pre>

Run server with
<pre>python3 WL_BrotherLabelPrinterServer.py</pre>

Test with Postman - Post command:
<pre>IP: http://10.0.0.81:5000/print_label</pre>

Body (raw / json):
<pre>{
    "QR-ID": "123",
    "Title": "Sample Product",
    "Size": "4x3 m2",
    "Discount": "5% Discount",
    "Price": "9 CHF",
    "Labelsize": "standard"
    "PrinterIP": "xx.x.x.xx", 
&nbsp;   "color": "yes" 
}
</pre>

To autostart the programm at startup add crontab job (don't use rc-local). Call on the raspberry
<pre>crontab -e</pre>

and add the line below:
<pre>@reboot cd ~/ && sudo python3 WL_BrotherLabelPrinterServer.py
</pre>

=== Example Labels: ===

[[File:BrotherLabelSample.jpg|x200px|BrotherLabelSample.jpg]]

=== Further Links: ===

Description command line tool brother_ql: [https://pypi.org/project/brother-ql/0.8.3/ https://pypi.org/project/brother-ql/0.8.3/]

Using a Raspberry to make a generic printserver for the Brother Label-Printer: [https://www.splitbrain.org/blog/2020-08/18-raspberry_print_server_for_brother_ql-500_label_printer_no_cups https://www.splitbrain.org/blog/2020-08/18-raspberry_print_server_for_brother_ql-500_label_printer_no_cups]

[[Thunkable_App_für_Materialwirtschaft|Thunkable App für Materialwirtschaft]]

[[Google_Sheet_für_Materialwirtschaft|Google Sheet für Materialwirtschaft]]