I only had some really long screws so i used them and then just hacksawed the ends off to fit nicely and then filed the burs off the edges. I'm just using a regular dowel. Unsure if the friction of wood on wood of the bracket, or friction of wood on plastic of the spools, will be too much for the printers to pull the filament without causing issues. If so I could use some ptfe tubing as liner for the spool holder hole by cutting the tubing down the middle and placing into the hole, or I could just use some paste wax at the very minimum. Of course I could 3d print a 2 part collar if needed as well. :) That is the beauty of 3d printing and laser cutting combined, you just make what you need when you need it!
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