No don’t really have a customer asking for bigger tube at the moment but what I do is custom cutting so you never know what comes along I would probably go with the 350 mm chuck as of now just not quite ready to invest in a machine at this time but am hoping that in the near future I can justify buying one. Also you had shared a video of the back chuck speed changed from 200 to 400 I wonder if that could be sped up to closer to 800? When chuck is empty in revers also the video you shared when you cut the sample part for me it took about 3 mins to cut it with 1.5k if you had been using 3k or 4k what would your estimate time of cutting be ?