Project Venturi

Project Venturi (Largely with the Anycubic Kossel Linear Plus in mind)

Ok, ok... that's a bit grand for some bits of printed plastic for attaching to you printer but bear with me.

First, apologies:
Exhaust_Duct.stl is in my opinion... awesome. Sadly testing suggests Cannon.stl and Dual_Cannon.stl were not so hot after all. Also Dual_Cannon.stl was quite the SOB to screw in place. I've therefore reworked them both and replaced the old versions with new and hopefully better designs. I'll u