Thanks for printing the design, I'm sorry to hear that your solder doesn't fit :|
I put links to all the parts into the summary, if you want to check those out. It should have occurred to me to do that when I posted this.
If you'd want to reprint this for a different solder spool size, I can adjust the dimensions and post a new mesh file. I'll also upload the Fusion 360 file when I get home from work, so that you (or anyone else) can tweak the model.