Spool holders for Printrbot Play

since my spool rack did not came with my printer, I decided to make my own.
The design needs twice the part "1.STL"and "2.STL".
Also,is it necessary to use two pieces of m10 metric thread that are about 20 cm long.
I personally do not recommend this structure because it does not look professional.
But in an emergency, it will work.