Adaptive pedal for Kinder King Kids Tricycle (Amazon link below)
Designed for a tool-free perfect fit. Pedal and top bracket will need to be mirrored in slicer. Two adapters are required for each side. One adapter goes on upside down, one right side up, with the inner groove pressure fitting into the lip on the inside of the already attached pedal. I used 90% infill on the pedal itself, 50% on the adapters, and 30% for the top bracket. Grooves are for 1" wide double sided velcro ordered from Walmart. Plenty of room for kids to grow into! Might work with other models of tricycle, but it is designed for this model, so try at your own leisure. I printed this model on a FlashForge Adventurer 5M, so some adjustments may be necessary for other printers.

Amazon link to tricycle: https://www.amazon.com/dp/B0DK6RVJDB?ref_=cm_sw_r_cso_fm_apan_dp_Z76B89F07EYXH4TP43MV