I created this Thumper prop from images and clips I found online so it's not an exact replica but I believe it is pretty close. There is currently no functionality in this model but I am working on a motorized version that will hopefully be able to actuate just like they do in the movie.

All parts were printed in PLA using 0.2mm layer height and 10% infill to cut down on printing time but you should be able to use whatever material and settings you like. Minimal supports are required for the holes in the top and bottom piece as well as the upper overhang on the pump. The model is designed to be glued together however, I designed the middle part to be held in by the pump without glue so it can be rotated like in the film.

There are two versions of the spike: one where it is fully extended for placing the ground and another where the spike is retracted for carrying the thumper around. Only one version of the spike needs to be printed depending on what you need the prop for. The retracted spike is one part and the extended spike is two parts that need to be glued together like the rest of the model.