Formbot/Vivedino T-Rex 3.0 BMG and Dragon Hotend Upgrade
Description
This is a simple upgrade kit for a Bondtech BMG and Dragon hotend designed to be as drop-in as possible. 1. Replace the top two motor screws holding in the PCB's with longer 35 mm M3 bolts for the spacer. Reuse the stock mount screws for the motor and fan mount. Make sure the fan mount holes are oriented at the bottom of the mount bar after bolting onto the motor mount. Add the 6mm spacer to the Dragon hotend. 2. Fan ducts should be printed with high temp filament such as PETG, PLA+, or NylonX and with supports. Use tree supports if using Cura. Use stiff and strong filament for the motor mount at 100% infill. 3. Before attempting to print, be sure to update the E steps using the included g code. Just select it on the SD card and print. It updates instantly. Use a right-hand (normal) BMG for the left side and a left-hand (mirrored) BMG for the right side. Reverse the motor directions in Marlin or by rotating the connectors, although it is easier and recommended to update the firmware instead. 4. For building the mesh for bed leveling, remove the extruder thumb screws so as to keep the probing extruder from running into the right extruder. After this, make sure to keep the extruders at least 40-50 mm apart.Reduce print bed size in the y-direction by about 10-15 mm and x-direction about 40 mm if you want to be sure that there are no issues. 5. You may need to adjust flow rate and other extrusion settings after the mod.
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