No interaction needed after it comes off the bed. All screw internal and external fit and screw seamlessly. You can add batteries for extra weight or buy a box of M3 Nuts and fill it to the brim, Choice is yours! Hell, you could fill it with sand/dirt/rice or pebbles if your really stuck. I designed it to work with Bambu, Cardboard and Plastic spools. As long as the centre hole is no smaller than 52.5mm and the spool width is between 58 to 70mm this design will work.

Final printed weight of it empty was 75.9grams and with 5 x AA + 1 x AAA was 204.2grams

Print Settings I found to be a good all round with a 0.4 nozzle with a strong and solid feel was using the (See picture of settings) standard 0.20mm Strength and tweaking the following

WALL LOOPS = 4

TOP SHELL LAYERS = 4

BOTTOM SHELL LAYERS = 4

SPARSE INFILL DENSITY = 30%

SPARSE INFILL PATTERN = Gyroid

I have also included the 3MF file so you can simply load and print