> 1. A three-dimensional modeling apparatus comprising a heated build chamber in which three-dimensional objects are built, a base located in the build chamber, a dispensing head for dispensing modeling material onto the base, the dispensing head having a modeling material dispensing outlet inside of the build chamber, and an x-y-z gantry coupled to the dispensing head and to the base for generating relative movement in three-dimensions between the dispensing head and the base, characterized in that: the x-y-z gantry is located external to the build chamber and is separated from the chamber by a deformable thermal insulator. [...]
I assume you are talking about this Stratasys patent that expired earlier this year, https://patents.google.com/patent/US6722872
> 1. A three-dimensional modeling apparatus comprising a heated build chamber in which three-dimensional objects are built, a base located in the build chamber, a dispensing head for dispensing modeling material onto the base, the dispensing head having a modeling material dispensing outlet inside of the build chamber, and an x-y-z gantry coupled to the dispensing head and to the base for generating relative movement in three-dimensions between the dispensing head and the base, characterized in that: the x-y-z gantry is located external to the build chamber and is separated from the chamber by a deformable thermal insulator. [...]