This is a golf umbrella extension holder. Use it to raise the height of your umbrella on your golf push cart by approximately 6 inches. The model is based on the MGI Zip Navigator version from the manufacturer, but can be used in any golf push cart umbrella holder. 

There are two versions of the Gcode files, one for a 0.4mm nozzle and the other for a 0.6mm nozzle. The model is split into an upper and lower section so that you can print it on a MK3S+ (which I did). The lower section screws into the upper portion, but you can also glue it in for extra strength. The lower section Gcode file also includes the screw and block model in them. So if you use the Gcode files you only need to print one pair of the upper and lower (0.4mm or 0.6mm version). The block can be pressed onto the screw after inserting it into the upper portion. You may need to use a clamp as the fit is tight and I didn't want the block to fall off. I used a C-clamp to help assist and it worked well.

Printing tips (if not using the Gcode files).

1. Print the upper section upside down with supports, but only use supports on the portion where the screw goes into and the for the portion that extends beyond the cylinder. You don't need supports down the entire inside.
2. The lower section, block and screw don't need any supports when printed.