Zipper slider (size 5)

Zipper /zip slider by ambekhit is great - and they should take the credit for the original design; however, when I printed it on my Geeetech i3 pro b, which has been calibrated in firmware for accurate sizing, the zip worked briefly and then started to fail due to the gap between the front and back being too large. This led to the two sides of the zip slipping out, rather than being pushed together.

I resolved this issue by importing into openSCAD, and scaling the front of the model so the ed