This 3D-printed gravity knife is a fun fidget on the go. The knife is thin enough to fit in your pocket or small purse.
If you're interested in more fidgets or puzzles, I sell a lot of them on my eBay store page here:
https://www.ebay.com/sch/i.html?item=176231804545&rt=nc&_trksid=p4429486.m3561.l170197&_ssn=tyhor_74