Tennis Serve Trainer Aid

thingiverse

This tool will help you develop your proper tennis serve motion, timing and power. It really works wonders. This is what it supposed to do and this design replaces the socks that are shown on the video, see this guy's explanation how to use it https://www.youtube.com/watch?v=oVh7tsa2R6I The grip size of this design is 4 3/8 or G3. Print Settings Printer: Wombot Exilis Rafts: No Supports: Yes Resolution: 300 micron or less Infill: 25% triangular Notes: wall line count with 0.4 mm print head nozzle is 3 and with 300 micron resolution 4 on the top and bottom. The butt is sitting on the print bed. Your printer should be able to handle 6.5" or 165 mm tall parts. How I Designed This How to build it You can use various braided cords for the center but make sure it has enough strength to handle the centrifugal force. Feed the cord through the handle and tie a knot at the racquet handle butt to stop slipping through. For the head part I used 4 warn and/or soft tennis balls I had at home. To create the ball holder part, you can get very creative. I had some very strong window blind material at home and made a tube with an overlocker, sewing machine is good too but with the overlocker it is simpler and faster. You can also stuff the balls into a sock and tie it to the end of the cord, making sure that the overal length is no longer than 27" or 685 mm. Some kind of net tube would also work if the netting is strong enough. To finish the creation I rapped proper tennis over grip on it to simulate the racquet handle feel. Weight Adjustment You can adjust the weight by using up to 4 balls. I would not go higher than 4. If you want more weight, than you could cut a small hole on one of the tennis balls and squeeze some liquid nail adhesive through the hole. Let it dry for a while to allow the glue to skin and that way it will not come out of the ball. You can get liquid nail from your local hardware store for next to nothing. It is cheap in large tubes, more than 0.5 lb or 250 g, and dries flexible. It will not dry to be rock hard, hence it will not injure the user or someone else. Note: do not block the hole so the glue can set. If you filled one tennis ball with liquid nail and you still need more weight then repeat it on a second ball with the appropriate volume of liquid nail that will give you the desired weight. If you want less balls, perhaps because you used a short socks as the ball head part, but the weight is not enough then you can do the above.