To use the Geeetech i3 Pro B successfully, you need three distinct types of software:

The i3 Pro B is not proprietary, meaning you are not locked into any single slicer. The community favorites fall into three tiers:

Ensure these baseline directives match the physical configuration of your i3 Pro B:

The Geeetech i3 Pro B is a robust machine, but it lacks the "smart" software features of modern printers. The difference between a frustrating pile of spaghetti and a flawless benchy comes down to the software choices outlined above.

The i3 Pro B has a relatively heavy extruder assembly. Keep your print speeds between 40–60mm/s. Anything above 70mm/s will result in ringing artifacts unless you have added bracing mods.

: A popular free option. While older versions like 15.04.6 are often cited in guides, modern versions can be configured by creating a custom FFF printer profile Thingiverse