Of course, anything is possible in CAD. I did start designing a series of models that would serve as āmergeableā plugs, both threaded and unthreaded, that could be combined using a Boolean mesh for this exact use case. The challenge, of course, is that one canāt always count on geometry that lends itself to adding a plug.
Itās a topic Iām also playing around with for a while. One pretty safe option are the steel balls that Bambu has also listed in the Makers Supply Shop, but from a cost perspective the 5 and 10g car tire weights are by far the best option in my opinion. Their weight / volume ratio is just 8-9% worse compared to the steel balls, but they just cost 1/10th of the steel balls because theyāre such a mass produced item.
If you need a good storage space for your buildplates please give this a try. It is very heavy since the printer is on top of it 
Iāve never tried the sand technique, but Iād recommend to keep a hollow inside the part and some type of cap part to close it up after filling with sand but wait until you have completed printing.
Iāve used two techniques for adding weight:
The first is to create an open hollowed out area in the model, and fill it with a set of weights like above from Amazon. I used Tungsten Steel Weights and Epoxy Resin along with Mica Powder Dye to cover the part and keep it in place to avoid shifting. This worked fine, but required extra post processing for the part.
The second was an experiment I tried to keep the print simpler is to just use more infill (50% or higher) on the base parts where I needed the weight. This also worked well, and required no post-processing. It does add to the cost, and you can probably get the weights used above at a much cheaper price than filament. It also does require that the base part is wide enough to prevent tipping.
Use BBs. They are heavy and cheap and the fan wonāt blow them around.
Consider using steel shot, like hunters use in shotgun shells. Itās readily available, cheap and is available in different sizes. Years ago, I saw steel shot available in 50 pound bags. Same or similar material is also used for shot peening and shot blasting metal parts.
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I looked up how to make my prints heavier and one site said to use sugar. The same thing happened to meš
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Never tried adding weight to my prints, but is there something that Iām missing or OP just did that wrong? If I were to do it, I would:
-pause the print right before top layers get printed
-turn off aux and chamber fans via Bambu Handy
-hold a paper sheet between the model and toolhead to avoid draft (or disable part fan as well)
-carefully pour sand into the model
-turn fans back on
-resume printing
I donāt have any intention to offend anyone here, maybe Iām just missing some important factors.
Because to avoid the issue (fan blowing the sand everywhere), you would have to leave all the fans off until you finish printing the layer that will seal everything off. Not the best way especially since the first layer that will seal the sand volumes will be a bridging layer with no cooling if part fan is off.
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While you could do that, the whole point of the fans is to promote a different rate of layer adhesion. Try this experiment and see what I mean. Print a simple cylinder primitive that is 100mm in height, PLA is best for this. Then in the middle of the print, turn off the fan. Let it print another 10mm and then turn the fan on again. Or better yet, print one of the variety of test overhang models and perform the same test.
https://www.printables.com/model/170727-overhang-test
It sounds to me that you havenāt actually attempted this but if you do - and I donāt recommend it - please, please share your photos. 
I did not suggest to turn off the fan during the printing operation. Just when itās paused for adding weight. And yes - i havenāt attempted this yet, which I stated at the very beginning of my previous post. Seems you got triggered very easily so letās say you were right and you could not avoid your issue in any way.
I like .177 BBās, I warm them up before adding to the print. Reduce infill to 0% and increase top to 6 layers.
https://www.princessauto.com/en/ammo-copperhead-bbs/product/PA1000001600
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Hahah I would never come up with this idea, but good to know.
This is probably some of the cleanest most dust-free gravel Iāve ever used. I can place it directly in the aquarium without even rinsing it.
https://amzn.to/3XrhEkt
Ohhh I was thinking about using sand and was wondering what would happen. Thanks for sharing it with us and failing for us 
Together we fall strong