I got these shoes as a gift and didn't try them on for a while. It was far too late to return them. And good golly - the were a snootch too small. No probs - I'm an evil genius.

The bolt holder is threaded all the way down. I print it vertically... on a kind of slow speed so it doesn't wobble.

I've included a few different pushers to get you started. And a 'blank' for you to add to for your needs.

Thread in bolts on either side of the bolt_holder. Snap on your pushers. Put it in your shoe. Then loosen the bolt you have access too to create some pretty stout resistance. Sit back and watch the paint dry.

I let my sit for like a week. Expanding the bolt every now and then. I could easily snap the stitches or rip the canvas out of the sole if I was to aggressive. So calm it down Chachi. Slow and steady.

Infill is important on this one... I printed at 5% and the pushers broke. 20 to 30 seems to work. I guess depending on how aggressive you are stretching your shoe.

Oh I'm not sure what the exact bolts size are. I just went through my "Random Bolts" coffee can. I'm old and have a Random Bolts coffee can. You should start one too.