>> wont the PLA in the motor base soften with the motor heat in a long duration print ? <<
If the motor current is adjusted properly (only little is required, about 1/3 of the maximum setting), the motors only get slightly warm at maximum... they're way overdimensioned for the low moving mass of the 3DR.
At first I was more concerned about softening the PLA base because of the heated bed, but my usual 50°C setting seems too low to cause any problems, and also there's a 6 mm cork insulation between the heater and the PLA base.
If the motor current is adjusted properly (only little is required, about 1/3 of the maximum setting), the motors only get slightly warm at maximum... they're way overdimensioned for the low moving mass of the 3DR.
At first I was more concerned about softening the PLA base because of the heated bed, but my usual 50°C setting seems too low to cause any problems, and also there's a 6 mm cork insulation between the heater and the PLA base.