I modded the design to include a slightly flared base which helps keep it stable, and four circular indents for AUS $1.60 worth of 10c pieces to add a bit of weight. I haven't glued the coins in yet - I need to print some circular covers for the holes - but just testing the weight with the coins gives enough mass to hold a ball of yarn about 25-30g. That's about 90m of four-ply, which just fits in the bowl. I printed mine at 97.5% full size so it would fit on my print bed with an ooze-wall as I was doing a two-colour print. I gave the inside a light sand with P180 abrasive paper and finished it with 1200 grit wet-and-dry abrasive paper.