trezor-hardware VS Bip39-Dice

However if you want, you can open it up and then 3d-print a new case.

If you want to repair, here is the description of the hardware: https://github.com/trezor/trezor-hardware/blob/master/electronics/trezor_model_t/index.md

Trezor is completely open hardware and open software. That means you don't have to trust, you can verify. You can even build everything yourself if you wish to prevent potential supply chain attacks.

Trezor is fully open source. Software, Firmware, PCB Schematics even the plastic case design! The whole shabang. Yes, this means you can build your own trezor if you wanted to. That's the kind of hardcore security dedication that we should support.

Open hardware https://github.com/trezor/trezor-hardware

You can also build the entire Trezor hardware wallet yourself. The files for the 3d printable case is on Trezor's github, along with the schematics for the circuit boards and all of the little electrical parts needed to make it. https://github.com/trezor/trezor-hardware https://github.com/trezor/trezor-firmware

BIP-39 Dice

You can't really. That's why using open source software is so important. Or do things fully offline by hand to be sure: https://github.com/veebch/Bip39-Dice

You can make a wallet by rolling dice actually (or any other non-digital source of randomness). Here are some instructions: https://github.com/veebch/Bip39-Dice

https://github.com/llvllch/Bip39-Dice to generate the mnemonic, https://iancoleman.io/bip39/ to generate the address