Hi all, I love these boxes but wanted to get far more tiny bolts in a try without them all getting mixed up. I have many M2 M2.5 M3 bolts and did not want to wast such a big amount of space in the half size 1x1 so i took to tinker cad and moded the 1X4 half tray to give you 15 small slots, ample for the 30+ tiny bolts. Printed on a P1S 20% infill, PLA Hope this helps others \o/