.bin is a fairly generic extension.
This .bin file may not be intended for the Mac to open. Safari may be trying to open it because it thinks that it might be, say, a Mac file encoded using MacBinary II format (to preserve data + resource forks). But seems possible that we're dealing with a process like that for digital cameras, where the idea is to
- Download the .bin file intact
- Place it on a memory card (probably in a top-level directory), according to the printer manufacturer's directions
- Turn the printer off
- Insert the memory card into the printer
- Turn the printer on, and let the printer read the .bin file from the memory card, and carry out the firmware update
The last step might happen automatically, or you might have to go into some printer menu and ask for the printer to carry out a firmware update.
One thread that I found referred to a microSD card and said it couldn't be bigger than 8 GB. I would recommend for the OP to do some searches, especially on the SoVol 3D forums, and maybe ask questions there.
https://forum.sovol3d.com/t/sv06-firmware-update/1788/8
While the idea of having a device install its own firmware updates is very familiar to me, the exact steps needed for this device are as clear as mud.