Putting silica gel in a spool's hub is a great way to help keep the filament dry, and there are many many, many many ‘cans’ (and yet another, some over engineered) to hold beads. Sadly the cans use a lot of filament and take hours to print, even on a fast printer.

Maybe you don't want to fool around with loose beads, or perhaps like me, would prefer to reuse the silica bags that come with each spool of filament. The only thing is that while the bags can be popped into the spool hub easily enough, they fall out just as easily when you handle the spool. They fall out when you're loading the spool. They fall out when you're printing. They fall out in the dryer. They fall out when you're preparing the spool for storage. They always fall out.

Enter the Splat*. It presses into the spool's hub to create a cage that captures the silica gel packet so it stays put. That's it. About 7 grams of filament, 22 minutes in PETG on an X1C. One size fits most.

The Splat* likes PETG because it has to bend and PETG is quite flexible. PLA does work but is not recommended. PLA will take a ‘set’ if you put it in the dryer so it loses it's springiness and falls out. It also won't be nearly as durable when used with spools that have a small inner diameter like the Bambu reusable spools. To install into a spool, place the spool on a flat surface. Put The Splat* over the hole/hub and press it in. It'll slide around a bit and want to go sideways, but it's not too difficult. When it's about ½ way or all the way in, add your silica bags then adjust The Splat* so nothing is sticking out. Bambu resuable spools work best if you press in with the spool's label facing you—these spools have an uneven inner surface on their hub, and The Splat* settles in nicer when installed by pressing it into the side with the label.

No supports, brims, rafts or other special considerations when printing. I print it with no top layers because they're not needed for strength and are a waste of filament that hides your choice of infill (infill in this model is mostly for decoration).

If you do print in PLA, let it cool down before pulling it off the plate—it's quite thin and if it's warm when you pull it off it can/will warp (in basically an instant). If that does happen, a quick dip in near boiling water followed by setting it on a flat surface might save the day.

Why is it called The Splat*? Because it looks like a splat. (“Splat”:n — A boomer computer nerd term for *, because it's easy to say and 100% visually accurate. The real name of a capital-8 is neither. Along those lines, this thing ‘!’ is a “bang”.)