PC4-01 bolt

The PC4-01 pneumatic connectors I ordered had a partially closed end which blocked the bowden tube from passing through. Normally this should be open but instead there was a hexagonal shaped hole.
So I edited a part from [this thing](https://www.thingiverse.com/thing:2896547) so that it could still fit and the filament could easily make its way through the bolt.

Printed out at 25% cubic infill with default supports enabled.