This bumper for Flipper Zero was designed specifically for all the transparent variant or customized transparent mods.
The cover is 2mm thick and to facilitate insertion, I recommend using filaments that have a hardness equal to or lower than Shore 80A
The commercial version can be found at the following link: https://endimadesigner.etsy.com/
The author remixed this model.
The new cover features lightenings that allow it to be inserted on the Flipper Zero