I wanted a guide to easily feed the filament straight into the run-out sensor and extruder with no snagging or drag. This is a far better guide than any others I've seen. It is specifically for my Geeetech A10 v3 but if it fits yours or can be adapted to, all good. Before I designed this I was using a square of PLA screwed to the frame, section of coat hanger, and a printed wheel.

This uses: one 608 bearing (https://www.amazon.com/dp/B07C6FL8TW/ref=cm_sw_em_r_mt_dp_U_kp7kEbJSX63DS) two m3 socket cap screws (https://www.amazon.com/dp/B06XQLTLHP/ref=cm_sw_em_r_mt_dp_U_xq7kEbDKJRQ5M) one m3 flat head screw (https://www.amazon.com/dp/B0734Q7DDG/ref=cm_sw_em_r_mt_dp_U_kr7kEb3XPE96T)

Added a modified shorter arm. It's shorter and moved to the front a little (Untested). Request mod for, Mikeandthemechanics