Marx 6 inch gondola wire spool load

I originally use empty thread spools, but they were just slightly too wide to fit properly in the train car. So I custom made spools to wrap fairy lights around and then created a rack to hold them (and hide the battery packs). Used Grok to get the original ideas in openScad and then modified them heavily for my purposes. The fairy lights were purchased from Amazon: https://www.amazon.com/dp/B097RC8HJM?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_8&th=1