I bought these metric hole saws on banggood.com and wanted a way to hold them. This was designed in inches and if it appears very small in your slicing software, just scale it accordingly (X 25.4mm). There is spot on the bottom where you can glue in some 3/8 X 1/16" round magnets. This is optional.

Creality

CR-10S

No

Yes

.2mm

30