OK, probably not a whole lot of people will need this part, but if it breaks, you'll haver a heck of a time finding a new one. It's the rail to mount an Alien Bees / Paul C. Buff ABR800 Ringflash - which is out of production and spare parts are hard to come by.

After you print the part (I used PET-G, and 1 mm wall thickness), you will need to drill-out the channel the screws goes in (increasingly larger drills, final is 3/8"), as well as where the screw sticks through (just a tad over 1/4" worked for me). A 1-1/4 long stainless steel 1/4-20 Allen-drive cap screw from Lowes (Item #21392) fits.

Creality

Ender 3

No

No

0.16

35%

wall thickness 1 mm, printed at 245 dC and 80 dC build plate

Drill out hole the screw cap goes through to 3/8", and 1/4".