Learn Arduino?

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To make displays easier, I tend to add a 4 pin JST connector on the boards for I2C connections.

Then an I2C LCD or OLED can be easily added to the project.

 

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This looks like it may be an even better buy as it has more installed on the PCB!

Geeetech GTM32_103_V1 3D Printer Control Board with Smartto Firmware For A30T | eBay

Before order, pls check if your printer has this type board or not. You may need these!

www.ebay.com.au

 

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I've just got this display module running.
It has a 1.3" mono OLED display, an encoder and a couple of push buttons. unfortunately, I wasted quite a time trying to get the code working as I had connected one with the power reversed

I may use this display more but not directly for the Arduinos as it is 3.3V only. So this is driven by an ESP8266 for this test.
Here is my test code and the libs.
Also, the 3D printer .stl files.You need 2 of the small push buttons, in an other colour is best.
I may edit the 3D design (yet again) as the push buttons could do with increasing their spacing a couple of mm.
EDIT: The stl files have been updated. And yet again!

These are available on Ebay and Aliepress......