AnyCubic i3 Mega Design Notes

These are notes and modifications for the AnyCubic i3 Mega series, including the Mega, Mega S, and Mega Pro; the Mega X is a bit different. AnyCubic could ship the i3 with these upgrades with little to no added cost.

Recommended modifications for the next hardware revision:

* Trianglelab E3D V6 Volcano clone, 0.4mm hotend
* 1.9mm Bowden tube
* Fix the linear rod deflection
* BLTouch compatibility: Run D11 to the unused pin in the print head, add 5 pins exposing D2 (already run), D11, GND×2, 5V for plugging in a BLTouch (user-supplied)
* Aluminum tensioner carriages for the 3D printed tensioner mods
* Flexible couplers

Total added cost to ship: $1.35-$3.55

Value propositions:

* Much better and more consistent flow (Volcano)
* Better retraction, less stringing and blobbing (1.9mm tube)
* Fix warped bed (fix Y-axis linear rods)
* Auto-leveling can be added easily (BLTouch pins)
* Belt change and maintenance is easier (tensioners)
* Z screw less sensitive to misa