Playing around with Tinkercad, I added my Celtic Cross design to the standard Dummy 13 shield.
The pictures show it printed in two sizes: 100% and 100%.
The file itself is only the 100% version.
NOTICE: I have not test printed it with the grip to see if it works with that part.
Tags
The author remixed this model.
Differences of the remix compared to the original
Added a cross to the original shield design.