MathLink Numberblocks compatible number plates

One of my kids loves Numberblocks and has several sets of Numberblock themed MathLink cubes. I've designed extra snap-in face plates, links, and tools. Those models are better than this one…

I attempted to create additional number plates (the 'numberling' small clear circles that rest in the top of the block and have numbers on them). The sets you can buy only include 1-10 and 11-20. So, I made a blank model and then added numbers 21-51. They work just okay but don't stay in as well as the original blocks.

In the photo, #3 is an original, #31 is in a block and will fall out pretty easily, #24 is in one of my spare links and fits in snugly and stays, #35 is showing it in the link but not in a block. I printed them with clear filament, so they're partially translucent but definitely not as clear as the originals. I printed them in dual color, so the numbers are black filament but you could print them all one color and paint them.

Good luck and sorry these aren't as well designed as my others.