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For anyone that owns a Bambu Lab AMS you've probably experienced your filament spools jumping out of their AMS slots, jamming things up and causing your prints to stop when your spools are getting close to running out. This spool weight is my solution to this problem. It uses 8 dead (or I guess you could use fresh batteries if you want to) AA batteries as weight and is designed to fit inside spools with an inner diameter between 53 and 65mm. It uses a simple to use screw together design with the lid marked with an extra little nub off the center circle to help identify it. With a full load of 8 AA batteries it's total weight is 9.1 ounces or 258 grams, using PLA and the print settings I've listed below, which adds plenty of weight to keep your near empty spools in their slots.

There are 3 pieces of the spool weight; the main body which holds the AA batteries, the cap and a battery spacer which slides in once all the batteries are in place to keep them from clunking around inside the main body of the spool weight.

Update:

Upon request from a friend of mine, I perforated the main body and cap of the spool weight to turn it into a desiccant holder/weight you can use to add a little weight to your spools and help keep your filament dry. Desiccant not being as dense as AA batteries, when filled with 3-5mm diameter silica gel desiccant beads, the total weight comes in around 4.8 ounces or 138 grams. Not quite as effective at being a weight as it is with batteries, but it's still something and it helps absorb moisture far better than batteries do\u2026 which don't absorb moisture at all.

The desiccant version of the spool weight can accomodate the same 8 AA batteries the non-desiccant version holds, so for maximum flexibility you can just print the desiccant version and fill it with desiccant when you want to absorb moisture and then fill it with batteries when you want more weight.

Layer Height - you can print at 0.2, but I would recommend 0.16 or 0.12 as it makes threading the lid into the main body A LOT easier. At 0.2 I had a REALLY HARD time threading them together the first time. At 0.16 threading the lid on was easier, but at 0.12 there was no trouble at all, the parts screwed together like butter.

Wall loops - 3

Top shell layers - 8 (you can use less at greater layer heights)

Bottom shell layers - 8 (you can use less at greater layer heights)

Sparse infill pattern - Gyroid

Sparse infill density - 15%

Only one wall on top of surfaces - Top Surfaces

Only one wall on first layer - Enabled

All other settings I leave at default

Support - You should be able to bridge the recessed circular designs on the lid and bottom of the main body, but I used PETG for the support interface since I was printing the spool weight in PLA. The PETG support interface provided a really great base so the finish turned out nice.

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Bambu Lab AMS Spool Weight/Desiccant Holder

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