Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5508282.

Here's my version of a lego lightsaber scaled up for human hands. There's a version that is hollow and has button holes that mtahc that of this cheap saber, https://www.amazon.com/gp/product/B09PD3B2YL/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1. All parts should fit, but you may need to sand the connections if they don't for you.

Be sure to post a make and check out my other models