This is an adapter made for kids born without fingers to hold skipping ropes, golf clubs and fishing rods etc.
It is made out of Ninjaflex TPE. (Do not use hard plastics like PLA, even if thermoformed)
It requires two 20mm width by 300mm length velcro straps to hold it to the arm. They can be purchased at hobby sites like Hobbyking, which are used to hold RC batteries in place.
Elsewise, you can use 300mm of double sided velcro, and can be sewed in place.
I take no responsibility for the use of this design, and it is to be used at your own discretion.
Printed out of Ninjaflex (TPE), printed at half the speed of PLA, at 30mm/s. It takes about 8.5 hours to print this difficult material. I print on glass, with Elmer's Disappearing Purple glue stick on the bed for best TPE adhesion. It can be easily washed off post-printing.
Ninjaflex printing temperature is 230C with a heated bed of 40C. Good luck, and please feel free to ask any questions.
I take no responsibility for this design, and please use at your own discretion. Thank you.