Two sides + door + fan + heater for temperature control would be pretty neat. You could keep the PVC pipe or go to CPVC for higher temps ...
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If the steppers are buried in the support structure *and* really go for max torque / speed - they will get pretty hot. This may be a high torque design. You might consider allowing for fan mounts near each motor.
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If the steppers are buried in the support structure *and* really go for max torque / speed - they will get pretty hot. This may be a high torque design. You might consider allowing for fan mounts near each motor.