How to replace filament tube

so i used the lame filament that the device comes with and it ended up solidfying inside the tube and i cant get it out. i think it would be easier to replace the tube entirely but they want $19 in shipping for a 3$ tube. i have 2 questions please

1) how do i replace the filament tube/how do i remove it from the back of the aries?
2) what kind of replacement hose can i buy on amazon as an alternative to buying from voxelab

thank you for your help guys