I confess to having a problem with laser cutting offcuts… I find some of them hard to just throw out, they make such pretty shapes 
Anyway… I was looking at two such offcuts and they screamed ‘make that spool stand you have always wanted to make’ at me.
So, I dug through ‘the pile’ for four (salvaged) bearings and used my mini-table saw to square-cut some cable duct that fits the bearings well (with just a little bit of tape to shim for a tight fit).
I spent a few minutes in OpenScad
// spool roller bits
$fn = 180;
difference() {
bar();
for (x=[-1,1]) rotate([0,0,x*90]) {
translate([-0.15,36,-1])
cube([0.3,20,10]);
translate([-0.1,32,2.5])
rotate([-90,90,0])
cylinder(d=3.2,h=30,$fn=6);
}
}
translate([0,30,0])
difference() {
rod();
for (x=[-1,1]) rotate([0,0,x*90]) {
translate([-0.1,32,2.5])
rotate([-90,90,0])
cylinder(d=3.2,h=30,$fn=6);
}
}
module bar() {
intersection() {
translate([0,0,2.5])
union() {
rotate([0,90,0])
cylinder(d=12, h=86, center=true);
rotate([0,90,0])
cylinder(d=8, h=88, center=true);
rotate([0,90,0])
cylinder(d=5, h=100, center=true);
}
translate([-100,-100,0])
cube([200,200,7]);
}
}
module rod() {
intersection() {
translate([0,0,2.5])
rotate([0,90,0])
cylinder(d=10, h=100, center=true);
translate([-100,-100,0])
cube([200,200,10]);
}
}
Then I printed the result, drilled the offcuts test-fitted and assembled my bits.
I oiled the wood, prepped and sprayed the rollers well. And the results are great:
It works well; this printer lifts the filament up vertically so I’m not too worried about the spool pulling off the rollers. It handles a 5KG spool I have, and also some small ‘sampler spools’ sit properly on it.
The very simple spoolholders they replace (in the last picture) have served well for many years. But are too narrow for some large spool rims, not very stable, and have a habit of getting skewed and dragging on the spool. I’ve been meaning to fix this for five years now…