This plug significantly reduces the amount of space occupied by cabling when connecting to a usb charger (see pictures). When pushing in the 16 gauge copper wire, it should be tight. It helps to rotate the connector when applying pressure on the wire when inserting.
I printed mine w/ PETG @ 0.1mm layer height
for pins connecting to charger, i used 16 gauge solid core copper wire
https://www.amazon.com/gp/product/B003B91BTG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
for the wire, i used 30 gauge silcone wire.
https://www.amazon.com/gp/product/B01KQ2JNLI/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I sourced measurements for the connector from this:
https://grabcad.com/library/usb-a-plug-1
The author hasn't provided the model origin yet.