My granddaughter really liked this ..she wanted all the tops printed in different colors . Had to experiment with the scale as my dremel 3d40 printer uses print studio and imports it at too large a scale to fit n the bed so you have to re-scale it to fit the bed . the auto desk print studio allows for measure so I printed and measured the parts the adjusted the scale on the next prints to match what I measured . If you use 45 mm dia for the shell I found that 45 mm dia shell worked and I could print the head piece at size a that was strong enough and fit. i used 1.6 mm for the tail thickness to fit the slot . also could not figure out how to use the clips and what size to print them I used the same techniques to figure out the right size. I found the assembly in Jakes web site .