ggplot2 outside panel border when using facet

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I would like to have a border around the outside of my faceted plot but not have the lines that separate the panels inside the plot. The issue is that panel.border draws a border around each panel in the facet with no option to just have a border around the entire plot. Alternatively can you set the inside dividing lines to 'white' but keep the outside border 'black'.

Here is my code:

mtcars
mtcars$manufacturer=rownames(mtcars)
ggplot(mtcars, aes(x=manufacturer, y=mpg,fill=factor(gear,levels=c("3","4","5"))))+
  geom_bar(stat="identity",position="dodge",colour="black")+
  facet_grid(~cyl,scales = "free_x",space = "free_x",) +
  theme(axis.text.x = element_text(angle = 45,size=12,colour="Black",vjust=1,hjust=1),
    strip.background = element_blank(),
    strip.placement = "inside",
    strip.text = element_text(size=15),
    legend.position=c(0.9,0.8),
    legend.title=element_blank(),
    legend.text=element_text(size=15),
    panel.spacing = unit(0.2, "lines"), 
    panel.background=element_rect(fill="white"),
    panel.border=element_rect(colour="black",size=1),
    panel.grid.major = element_blank(),
    panel.grid.minor = element_blank())

Result: Faceted plot with inside borders

enter image description here

Desired output (edited in paint): Faceted plot without inside lines

enter image description here

My actual data plot that I want to remove the inside lines from looks like this:

Actual data plot with inside borders needing to be removed

1 Answers
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