This is a decent 3D printable Ping Pong paddle that I modeled. The only thing that you need to assemble it is glue
It has been printed and tested.

It bounces almost the same amount as a real paddle I have. But please note that if you want to get any spin on the ball you will need to buy some good Ping Pong rubber, as the included file for the surface does not provide much grip.

If you want to remix or sell this paddle, please ask for permission first.

---How to print---
Main Paddle
I recommend that you print this part in PLA with 20% triangle infill. Also it is best to set both the roof and bottom to the same thickness to ensure that they bounce the same amount.

Handle Inside
Print this part with the same settings as the Main Paddle.

Surface
Infill does not matter with this part. Print it in PLA for the best results.

Handle Outside
I printed this in TPU 95A to make it a little more comfortable, but it doesn't really matter what material you use. If printing in TPU, a 30% Cubic infill should be good.

Rubber
Print this in TPU. Different stiffness with change the bounce and grip. I printed this part with TPU 95A because I don't care about how much grip it has.
When printing this part, set the bottom thickness to 0.4mm, the infill to 30% Triangles, and the top thickness to 0mm.

---Amounts---
Print 1x Main Paddle, 1x Handle Inside, 2x Surface, 2x Handle Outside, and 2x Rubber.

---Assembly---
All the need to assemble is some glue (I used Tacky Glue).
1) Glue 1x Surface onto one side of the Main Paddle.
2) Glue 1x Handle Inside into the slot on the Main Paddle.
3) Glue 1x Surface onto the other side of the Main Paddle (Sandwiching the Main Paddle).
4) Glue 2x Handle Outside onto either side of the Handle.
5) Glue 2x Rubber on the paddle.
6) Wait for glue to dry.
7) Play Ping Pong!