Thumbwheel Grip

I bought some of these metal thumb wheels for my self-made printer and it turns out they are hard to turn when under load due to small edge grooves. This small simple part slips onto the thumb wheel to improve grip with 6 large grooves. I have 5 on my print bed and they work much better.

Fits ~16mm thumbwheel with 5mm hole but could easily scale or adjust for other sizes.

Print one to check fit before doing many. The ones I made it for are el-cheapo ebay thumbwheels that cost a few bucks for 5.