This spool holder isn't your average spoolholder, and being a novice at Fusion360, this to me is a downright miracle!
I printed this using S3D with 25% full honeycomb infill, using 3 top and bottom layers and no supports or rafts. Its printed through Octoprint to my CR10. The temps were 200 for the hotend and 60 for the bed and Matterhackers Silver PLA (1.75mm) for the filament.
Now the good stuff, this holder comes in three pieces, the bracket, which I made the part going over the board 19mm because 18 and 18.5 just didn't "cut the cheese", 19mm fit perfectly as the photos attest.
The threaded rod screws into the bracket and secures against the board, the spool (and you can fit 2 spools on there too) slides over the threaded rod and the "nut", which resembles a hotend nozzle, screws on to secure spools on the threaded rod.
Now for the so much more part...
You'll noticed a small hold on the back of the bracket, one through the threaded rod and one on the end of the nozzle nut. Is it for a screw to secure it to the board?
SURPRISE! If you drill a a 6mm hole through the board lined up that hole, you can thread filament from a spool on the shelf through the bracket, through the threaded rod and out the hotend nozzle, just like it was printing from your shelf!!! You just can't make this stuff up!
You'll also notice an arc and a small bump on the back of the bracket, the intent is that the shelved spool could ride on this (you'll need to print another bracket and install it opposite on the other board). Now, this feature is not fully activated because there isn't a retainer on the sides to keep the spool centered, but I could easily put one on if the interest is there!
So there you have it, my entry into 3DPN, myminifactory, and Matterhackers contest! Thank for the opportunity, I learned ALOT about Fusion360, printing temperatures, and that when you said your infill at 50% and above, it takes a REALLY long time to print, but it is REALLY sturdy!