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Hi, I'm trying to get into 3d printing so I can bring my ideas to life. I recently had a baby boy who has started learning to walk.

Problem: His walker moves forward (or backwards) when pushed (pulled) in an uncontrolled manner. When my son attempts to pull himself up or stabilise himself, the walker shoots forward, resulting in him falling over.

I would like to design and 3d print a mechanism which attaches to the wheels of the walker (simple wooden walk bought from Amazon) which controls its forward and backward movement.

Ideally, I would like the walker to move forward, inch by inch, and only when forward force is applied.

I'm a complete newbie and don't have any engineering knowledge. However, to illustrate some of the mechanisms I thought I might need I have attached a few pictures.

Can anyone please help me?