remixed cartridge shell 3d print files

[VonHirsch]

I created and uploaded a cartridge shell remix on Thingverse, letting you know in case you think it's worth linking to. Thanks for this project!!

https://www.thingiverse.com/thing:6257150

Changes:

Moved reset hole .5 mm towards inside
Increased the diameter of the M3 screw through hole (a8pico_front)
Modified the bottom to take knurled brass threaded heat set inserts
Removed problematic gap between through-hole and thread entry

[robinhedwards]

thanks!