I remixed this to make a bigger switch holder & cover, create larger rod pieces (to print on a larger bed CR10 type printer and reduce seams), and add screw end on the rod for easy assembly (donkey-brains). I included the original design files as STLs that I didn't modify for easy download. I made middle rods of 2 different sizes to allow printing on large or small printers. I printed the 391mm middle pieces on my CR10 Smart Pro to minimize connections. You need 1x bottom rod and 3x the 390mm middle rod for a large printer (or 6-7x 180mm middle rod for smaller printers depending on the staff length you want). All other parts you only need 1 each. I included a 7mm cylindrical gap in the middle of all the rod pieces to insert a 0.25" metal rod to make it more sturdy. Note the top 2 pieces you still have to super glue together as I didn't modify those (someone feel free to remix to improve this).

Printed the inner crystal in transparent flexible TPU and squeezed it through the top. Alternatively, you can print the Top1 piece of the staff to about 65%, then glue in the crystal part (made of PETG, resin or TPU), lightly press fit, and then continue printing top to enclose.

I included a picture of the wiring circuit diagram (2x AA batteries, switch, 3x 3V white LEDs). The battery holder slides into the Top2 piece, and you may need to sand the holder for it to slide in easily. Some have also printed the battery holder at 95% scale to give about 1.2 mm extra space as well as increased length to 110mm to allow extra space for contacts to be inserted and glued in.

LEDs: https://www.amazon.com/gp/product/B073QMYKDM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Switch: https://www.amazon.com/gp/product/B0C2GHK948/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 OR
https://www.amazon.com/gp/product/B07L74MMG8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
2x AA Battery Holder: https://www.amazon.com/gp/product/B07TB4HDYH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
AA Battery Contacts: https://www.amazon.com/gp/product/B07HRWS4W2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1