Creality Ender 4 Gantry Carriage

A simply remix of the gantry parts from Greg191134's comprehensive Core XY upgrade for the Creality Ender 4 (https://www.thingiverse.com/thing:2686559), to reduce twisting inherent to H-bot printers. I've added holes and clearance to continue using pulleys in the H-Bot configuration, which can be used as is, or in combination with the rest of the conversion to go full Core XY. I've included a stop that comes with the original pack for completeness.

Warning: I made an error with v1, v2 of the