I had so much trouble just printing on the Snapmaker because of all the ways filament could get stuck. I made this so I don't have to mess with the printer while it's printing, and I hope it can make it easier for you as well. I have made a couple different variations of this filament guide, but this one has worked the best for me so far. 

You can print this on the Snapmaker itself without supports. It is attached to the printer's Z Axis with two or more short screws that were included with the printer. Filament can be put in it to guide it to the extruder. 

Print the model with no supports at 0.2 MM layer height. More infill is needed to strengthen the part, I used about 40% cubic.