This is a general template for creating picatinny mounted items. It is meant for 21mm rails. There is an instructional PDF included with a README. Includes FREECAD files for any modification desired. The STL's are also included.

edit: 2/23 : added in a square pin that is press fit. only the STL though.

Creality

Ender 3

Yes

Yes

20%

To be 100% clear, the file is simply a block that has a picatinny slot made with a pin and pin hole, the rest is up to you.

If you do not wish to use the included pin, feel free to use a M5 screw.