Plunger:

• Increased base thickness, no longer requires support if printed flat side down

Barrel:

• Added stepping around interior of barrel to allow bridging to do most of the work.

Shells:

• Embed logo in shell sides
• Make trigger spring retainer a separate part, so that right shell can lay flat on printbed
• Increase first surface width of internal barrel support, so that it's not printed pointy side down

Pin back:

• Added fillet around pin handle for strength

Lock: 

• Increased hole size to match other pieces, increased support around larger hole

Trigger:

• Decreased thickness to allow side clearance