Improved Cap For Improved Linear Chain To Extruder On Anet A8

A remix of the original [cap for improved linear chain to Extruder on Anet A8](https://www.thingiverse.com/thing:2105627) designed for the [improved linear chain to Extruder on Anet A8](https://www.thingiverse.com/thing:1905344). Here are the changes:

* The 4 caps have been separated into one and rotated sideways. This gives the print more strength, and you can print the number you actually need.
* 2 new caps have been added: short and long. The long caps should be used with the longer mid-p