Top for M letter box

This is a remix of one part from the Letter Box models by muzz64 ( https://www.thingiverse.com/thing:2170442 )

One problem I found is the top for the letter M is backwards.The lip is extruded on the wrong side, and since the letter is asymmetrical, it won't work. I was able to fix the letter.

I have printed this, and it fits the box from Muzz64's design just fine.