its not perfect but it works, not perfect meaning you can still see some of the gridfinity squares on the bottom of the insert which becomes 100% hidden anyways , although IMO maybe this helps keep warpage down?! who knows, it printed fine without supports.  printed in petg. tpu seal. asa latch. m3 hardware. 

the height of the box is probably 5mm too tall - although the collects stay put they tend to become dislodged from the exact position of the insert - i suggest a piece of sticky foam under the bottom side would be more proper instead of lowering the top lip. even without it its not a big deal.

i loveeee this box size, the exact insert would be fun to “block in” and change for other various items, like a multimeter or something. you wont have to open fusion 360 etc. easily done with tinkercad since ive already changed parameters in f360