R82 Crocodile Turn Limiter

This is a beta version of the part, but it works really well, and has been printed with PLA+. Gives about ±10° of turning to assist with training children how to turn with the gait trainer, without them being able to fall to the side like I've seen when a small child has the turning locks off.

Disclaimer: I am not responsible for any damage, injury, or voided warranties that could occur from your use of this part. 

MUST FOLLOW STEPS BELOW THAT ARE NOT SHOWN IN VIDEO!

This part has a ring that fits into the original slot in the R82 Crocodile gait trainer caster wheels, and a locking groove set at approximately 45° which is a stretched version of the stock piece locking hole.

I haven't added the final curve and leading edge ramping to the model yet, so until I make a better model or video here is the procedure to follow once you get your caster wheel off:

1. Place a stack of electrical (PVC) tape underneath the original caster wheel locking hole that extends a couple inches radially (about 5 layers will do). This is to provide a backing for marching the gap while we work the part.

2. Warm up the curved locking groove (not the ring) print in hot water (I brought water to not even boiling then dipped for 30 seconds) until it is slightly soft, then immediately put on your Crocodile caster wheel (ring fully seated) and press down on the locking groove to form the curvature of its shape to the gap tape.

3. Hold the caster wheel locking pin assembly over this assembly such that you can see if the locking pin will contact the edge of the locking groove. If it appears the locking pin would collide with undesirable pieces or that deformation of the locking groove occurred, reperform step 2.

4. Note where the locking pin contacts the part when swept from outside, then remove the part from the caster wheel and use a utility knife or other method to trim down the edges, forming a ramp to allow the locking pin to slide into the locking groove. Do not trim the leading edge to a sharp point (leave about 1mm thick) and do not trim the ramp all the way back to the locking groove (maximize material thickness where we can)

5. Test fit the part onto the caster wheel and with the locking pin. If it appears the locking pin could (with minor force) could slide up the leading edge of the part and into the locking groove, remove the gap tape and reassemble the caster wheel as somewhat shown in the YouTube video. If it does not appear that the locking pin has free travel inside the locking groove or to ramp on the part, reperform steps 2, 3, and/or 4 as necessary.

6. With your caster wheel fully assembled with the part: with the locking pin disengaged you should be able to freely turn the wheel 360°, with the locking pin lowered you should be able to turn the wheel from either direction and the locking pin will slide into the locking groove and place your turning in ±10° mode.