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FYI, clear 3d filament isn't very clear at all. no matter the brand you get a fogged over look where anything an inch away from the material is impossible to make out. so if your expectation is some plastic model clear window that will not happen at all. the design with the windows on the ursa is to use clear plastic sheets and cut them out and glue those in since you really cannot 3d print clear such that it looks as you expect.

the body will also be weaker since the windows are separate pieces, so on roll over it will cause a good amount of damage to the body.

here is an example of 3d printing clear filament using the clearest filament available in 2018. this was after 4 hours of post finishing work