Hydroponic Tower (217mm inner diameter)

As I have limited space in my room, I modified the middle section to fit a smaller container. My first experiment with hydroponics was a success. After 6-7 weeks, the pak choi I cultivated was ready for harvest.Non-3D-printed materials needed: 4x M3 screws (long enough to securely hold the two middle parts together), a pump with 8mm diameter: https://www.amazon.de/gp/product/B096LN2M8M/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&th=1fertilizer: https://www.amazon.de/gp/product/B00KNY8JEM/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1pH and EC meter: https://www.amazon.de/gp/product/B07W4VJXYR/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1mesh grid8mm diameter tube