Well, the 3 button box took about 90 grams of filament. The spool has about 900 grams and costs $45. So if you had your own 3D printer and were just paying for filament it would be about $4.50 I guess. (quick math there) This also is using official Makerbot filament which isn’t the cheapest out there but I know it works well since that is the printer I have. I am not sure how many grams are used on the thing you are printing but $8 isn’t bad for a few things but if you are doing that a lot you almost might just invest in your own printer. That’s good price for the case you bought for buttons!
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