Silica gel funnel for Marvin's Ace Pro silica container

i needed a funnel to put the silica gel in those useful silica containers for the ace pro designed by Marvin_4001113 (you can find them here)

any other classic funnel needs to be hold over the container entrance, can be unstable or risking to spill silica everywhere, this is designed to fit exactly over the container and stay still while filling it

tell me if you liked it and any suggestion is welcome!