Yeah, sorry LangdonS, but do not use inexpensive power supplies, not worth the headache they cause, the time wasted finding they are the problem, nor the damage they might cause, and some are danger to life by not being isolated from the mains.
At a minimum use MeanWell or even better Delta, the price difference is not big.
Also, using old laptop power supplies is a very good idea, they are very high quality and do not fail.
For 5V supplies, there are very cheap and good quality ones form Anker, Baseus, Satechi, Gembird, just look for 5V only, so no QC or PD, always under 10$, isolated, protected, low ripple, etc.
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Another good idea is those same companies but the 65W PD adapters, use a trigger board set to 20V, they can be found on sale for 15-20$. I have plenty of these, like everywhere.
Waiting for 140W/28V ones to drop in price, one of these can easily handle 4 of so called TB6600 drives at full load with low inductance motors.
Although from experience, they really do not like back EMF. I killed one testing drones, as soon as you pull back the throttle fast = they die!
Anker 65W, only the output in use died, the second output still works fine.
