Summary

Bracket to screw to wall to hold a bar supporting spools of filiment.

I specifically made this have enough clearance to allow a http://www.thingiverse.com/thing:612878 with the 30mm hub and 70mm arms to clear the wall.

Instructions

I printed this with 1mm wall thickness and 40% fill. It is very strong.
I used PLA because I am still having issues printing large ABS parts.

I hung a 3KG bag of potatoes on just one bracket for a test and it did not flex or sign of distress. That was a prototype with a crack in it.

I used some aluminium tube that was salvaged from an old vertical antenna as the rod so its light weight and strong.

Be careful which screws you use and that you drive them straight.
If you drive them on an angle or use ones that are too fat you will cause layer delamination.

Spool holder bracket