4 models for 6, 7, 8, 9 mm diameter tube. Snug fit for tube and blade to get clean cuts without wonky ends. Every rectangle hole end/start is mark of mm.
If you need different diameters or longer cutting length, hit me a message.
I printed with 0.4 mm nozzle and 0.2 mm layer height.
The author hasn't provided the model origin yet.