In the file are the braces for the filament rack there's 2 types
Based upon 200mm spools

STL contains:

1 thick end pieces with 3 loose printed cylinders for filling in end pieces, this prevents the need for a mirrored version.
1 thin piece as to add additional support.

what else you need:

• 8mm rod of desired length.
• glue
• sandpaper/file (depending on your tolerances)