Revised Raspberry pi 5 Case

Revised the design to remove the outer M5 hardware, in favor of internal M2.5 x 10mm Socket heads going into Knurled nut inserts (https://www.amazon.com/dp/B0C2HGNYLX?psc=1&ref=ppx_yo2ov_dt_b_product_details). I have tested with the Active cooler and clearance is not an issue.

* I've found size is different depending on the printer, i have Dimentionally calibrated my K1 with the calilantern tool (https://vector3d.shop/products/calilantern-calibration), and found this prints best at -0.12%