Lightweight toolhead for Ratrig V-Core 3.1 with Goliath Short, VZ-Hextrudort and CPAP (MGN9H)

This toolhead is designed to be lightweight, yet very rigid. It was kept very simple, the complete head including cooling duct, belt tensioners, endstop and SuperPINDA mount consists of only six parts. The top plate (aluminum), the bottom part, the duct, the two belt tensioner blocks and the fan mount. There is no special hardware needed, just screws and heat inserts.

Belt tensionsers are integrated in the back of the toolhead, in the front the belts are secured with integrated VzBot-style belt clips.

The cooling duct runs down from the top, not from the back and bottom like on many other designs (Ratrig, VzBot, HevORT, ...). This avoids sharp turns in the air path and maximizes air throughput as well as making sure that the air exits the duct's nozzles in the correct direction. With many other designs, the air is shifted forward, more towards the front of nozzle at high airflow (due to inertia of the air). This design actually makes positive use of that effect in that it will make the airflow shift away from the nozzle at high airflows, so that the nozzle is not cooled down too much.

This design does not need an extra heatsink for the cold side of the heatbreak, as the top plate and extruder are made of metal and act as a heatsink. The 3010 fan on top cools down the top plate, extruder body as well as the motor. The Moons motor gets barely warm at 0.85A even after hours of printing.

The top plate is to be made out of 3mm thick aluminum, top.stl is included just for test fitting.

As a drilling guide, you can use top-drilling-guide.stl. Please note that only the hole positions are correct, not the diameters.

All parts print without supports. Rotate back-bottom.stl -42 degrees in X direction so that you don't have issues with bridges sagging in the tensioner slots. Rotate duct.stl 180 degrees in Y or X direction so that the top part where the CPAP hose connects sits on the print bed.

There are three different cooling ducts included, difference between them is the nozzles angle, the one with 45 degrees points the nozzles more inwards/up (towards the hotend nozzle), the one with 40 degrees more outwords/down (away from the hotend nozzle).

Tools needed:
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2.5mm drill bit
3mm drill bit
4mm drill bit
countersink drill bit
M3 tap (use rolled taps for higher strength threads)

Hardware needed:
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4x M3x6 countersunk screws (MGN9 carriage)
4x M3x40 countersunk screws (front posts)
2x M3x8 countersunk screws (Vz-Hextrudort)
2x M3x6 lens head screws (fan mount)
2x M3x16 lens head screws (fan)
2x M3x6 lens head screws (duct mount)
2x M3x6 lens head screws (Goliath adapter plate)
2x M3x40 flange head screws (belt tensioners)
 

2x M3 heat inserts (belt tensioner blocks)
4x M3 heat inserts (front posts)
2x M3 heat inserts (duct mounting holes)
1x M3 heat insert (SuperPINDA mounting hole)
3x M4 heat inserts (top plate to back mounting holes)