Simple no frills filament storage bracket for fixing to wall using a standard 15/16" (23/24mm) broom handle I used these…. https://www.amazon.co.uk/dp/B0BTDL691C?ref=ppx_yo2ov_dt_b_product_details&th=1
When using the full length handle I used 3 brackets and able to store 16 1KG spools.