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Very good! :) Just to make a comment I would have used the racquet strings for the collector instead of the fishing line. I also made a lot of collectors starting from cheap badminton racquets that I bought on purpose to save some work and I put their string too. I am used to give the collectors I make as a present to the tabletennis clubs I visit and to the friends that I meet during tournments. I also make the repairs and I see that fishing line may be cut or broken when it gets caught on an edge or on the foot of a hurdle. Also the racquet string, being of a bigger diameter can sustain the balls with a lower tension giving a softer feeling when catching the ball from the floor, while on the other hand the fishing line is more jumpy and springy. Anyway, well done! :)
Toy Splitter Ax From CardboardView Instructable »
Collector for Tabletennis BallsView Instructable »
The screw of the cap could be used to switch power on/off . To avoid the cap to fall when not tightened (power off) you can use a pin fixed on the bottle screw and a corresponding buttonhole on the cap that allows the required angle from on to off position.
Thank you :-) Battery replacement could be difficult if the plastic caps are rigid and the tie wraps are very tightened. If you need to change battery very often you can try to use 3 tie wraps at 120 degrees instead of 4 and adjust their tension to keep the battery in place and allow replacement at the same time. Since I use rechargeable batteries I prefer the robustness of the connection.