Very smooth operation. Congrats. BTW, “turn” is not wrong, but the word I would use is “spin” 
Problem.
The motors (nema17) are mounted on PLA supports. During operation they reach around 60-70 degrees Celsius.
Is it enough to cooling the NEMA17?
Or do I have to print them in ABS? (I don’t know if I can print ABS) 
Without an enclosed printer I wouldn’t print ABS, but what about PETG? It can’t take the heat ABS can take, but it can take more than PLA, and it’s easier to print than ABS.
turn (spin) test:
Counterweight test. Super:
Print ABS (black, green is PLA):
And order new MB for Ender 5: 4.2.2
It’s coming along quite nicely.
Wondering why you wouldn’t order a 4.2.7?
Reaching so hot means that the Amps are too high!
So, use bigger motors, so they don’t run so hot, or higher voltage motors so they don’t draw so much current?
For no reason, that’s what I ordered.
Turn and tilt.
With counterweight I don’t need that much power anymore.
I also ordered radiators for NEMA17, i can also add fans. We’ll see when I can assemble the whole machine.
Exactly! Is good to try a NEMA 23 on 4 Amps.
Unless his counterweighting reduces the temperatures…
This depends on the gear reduction to reduce the motor stress. But anyhow, a bigger motor will fix the problem for good!
Remember, all gears are made of PLA. The power of the ensemble holds the weakest link. It doesn’t help me I have a bigger engine. The counterweight reduces much of the power required and the movement becomes smoother.
Then check the current the driver feeds the motor…
alpha version: https://photos.app.goo.gl/7p1k72p9SEqVw8tk7
beta version:
Wow, that’s an amazing rig.
So the basis of throwing the birds is accomplished by two spinning wheels, isn’t it.