There are plenty of good spool holders out there. Why make another?

I recently discovered HomeRacker and decided it would be a great way to organize my workspace. There are already existing solutions for storing filament on HomeRacker, but I live in a dry climate and generally don't need dry filament storage. All I want is a cheap solution that integrates with my new shelving system.

And here we are! This tray prints mostly in place on its side, but it needs supports for the tapering ends (although on my printer, the supports came off extremely easy). Some things to watch out for:

• My slicer tried to put supports in the grille hexes, but I had no trouble with the bridging, so I recommend a support blocker for everywhere but the ears
• This fits a 5x10 HomeRacker base, and needs at least a 14x support if you're stacking vertically so the spools can come out (1kg size spools)
• Can fit a single 1kg spool, or two 250g spools side by side
• Note the design is not symmetrical front-to-back, it's designed so one end of the roll stays flush (if your shelf is against the wall, there's some clearance between the spool and the wall), but the other end pokes out

Super simple, not really a rocket-science-level design. Happy to fix things if people encounter issues.