FAQ
Octo4a should run on Android 5 (Lolipop) and newer, because it uses Termux under the hood. You will also need an USB OTG cable (preferably the Y type) and about 700 MB of free storage on your phone.
Unfortunately due to legal and technical limitations, the Play Store does not allow apps like octo4a.
You can use an Y USB cable (search for "usb otg y cable", example cable on Aliexpress). It splits the data and power cables between your printer and phone charger.
Unfortunately, not all phones support charging and USB OTG at the same time. Sometimes the issue is on the software side and changing your ROM might enable charging via the Y cable.
Another workaround is to just use wireless charging if the phone supports it, and connect the printer via a normal OTG adapter.
If you don't care about your phone's condition you can also replace the battery inside with a 3.7V power supply, but we do not recommend this approach since it might cause damage to the phone and even start a fire.
Please try disabling any battery optimizations in your phone settings. Also make sure that the phone is plugged in and charging. As a last resort you can prevent the screen from turning off by going to the the developer settings and checking "Stay Awake".
My printer is not being detected by octo4a. The app says "Printer not connected" even though it is connected via USB.
It is possible that your printer has an uncommon USB vendor id/product id. This happens especially on exotic Chinese 3D printers and mainboards. The app has a list of VIDs/PIDs which is used by Android to choose the app to handle the device. Please leave a message on the Telegram channel or create an issue so that we can add your printer.
You can join our group on telegram for support https://t.me/octo4achat and if you found a bug or a program you can create an issue.