Atari ST Floppy disk supports

There are 2 heights:

Tall=20mm
Short=17.5mm

This should accommodate all types, the short being for long button floppy drives.

Not Slotted=Solid object
Slotted=a cross across the top to aid getting it in the hole in the ST mainboard.

The pictures better detail the difference between slotted and not slotted.

Also now with or without a chamfer.

Prints fine at .2mm, but at .1mm if you get stringing, lower your filament temp.

Un-chamfered is probably your best bet as is closest to the original.