Building a bigger faster delta type 3D printer

I bought a 4 axis ethercat stepper kit (reference) , now I need to find a use for it. Decided it will be a 3D printer that will (hopefully) do what mine already can't.

It will be enclosed and heated, build plate will also be heated. The three delta motors will be up on top outside the heated enclosure, driving the carriages up and down via gear belts.

The door will be something like polycarbonate. Two thirds of the sides will be sheet metal heavy enough so it doesn't sound like a tin can. One third of the sides will be the clear door spanning most of the distance between two corner posts.

The linear rails are 2000mm long, I might try 2pc 1000mm to make the full length.

The frame as shown is incomplete... The three corner posts are 2" steel square tube.

The linear carriage blocks will have the gearbelt sandwitched between the carriage block and the arm bracket, teeth out. The return path for the belt is between the arms. HDT5M x 20mm wide gearbelt not shown.

Here is a problem. The arms will catch the drive motor, no matter which way I rotate it. I probably have to lengthen the arms of the 'center piece' that holds the extruder. Mounting the extruder drive farther away from the nozzle is not an option. Unfortunately the filament path is not centered to the extruder.

The plan is to have multiple extruders living inside the upper part of the 3D printer, with some method of automatically swapping extruder heads. The nozzle is attached to the extruder head, the high frequency induction heater is attached to the 'center piece'.

There will be spring contacts between the motor and the 'center piece', to make the motor's and thermocouple's electrical connection.

I might use strong magnets to hold the extruder to the 'center piece'.

The nozzle will be heated with induction heat. It will be interesting to find out whether the stainless steel tube 3mm od x 2mm id x 25mm long between the extruder and nozzle will have low enough heat conductivity to avoid overheating the extruder drive without additional cooling.

Just what I needed. The rotary screw extruder is centered on the mounting plate and it can probably push filament faster than any NEMA17 motor could.