Can print without supports entirely, although you might want them for the fasteners to hold the PTFE tubes (optional). Or if your cooling solution is solid, you could print them without supports and be fine.
I printed in 0.3 layer height for time but 0.2 works great too.
Here's my model in Onshape for you to remix:
The author remixed this model.
Extended the length so the guide is further away from the gantry. Moved Extruded cut from the bottom to the top to print without supports. Also, adjusted the fit of the mounting to be a bit more snug with the gantry.