Lowercase Letters Puzzle

My 3.5 year old son already has a puzzle like this with capital letters, but he was missing the lowercase letters. He asked me if I would print out the lower case ones for him, but requested that I only print out the ones that look different than the capital letters ones ... which I didn't :) I couldn't find any puzzles that fit so I created them in Fusion 360. (but very nice model is from Fight2Fly here) The size is 180x170 mm and the letters are about 20x30 mm. The letters are 0,3 mm s