When printing that slow, I usually print at 190°C for PLA, otherwise it may decompose due to sitting too long in the nozzle, because the flow rate is so low.
I don't know what nozzle you have, but I would suggest taking that width as line-width (e.g. 0.4mm if it is a 0.4mm nozzle).
Also, FDM printers like to print continuously, without too much retractions. So the flow through the nozzle is nice and constant. If it has to retract a zillion times on a very short distance, filament might be grinded in the feeder.
That milk crate has lots of gaps in the side-walls, it is maybe not the best model to print on an FDM printer. If you would change the walls into solid panels, like a traditional curver-box for storage, it would probably print much better. But the walls need to be at least one line-width thick.
I would guess the problem is a bit of all this? But it is a guess, not sure.
In the beginning, stay with the printer, and watch closely what happens, how it prints. Begin with simple test prints until you get them good. Then change settings on the fly, and see what effect that has on quality, while you keep watching. For example: on the fly increase and lower speed, increase and lower temperature, etc. Increase and reduce layer-thickness. Then you will get a good idea of the upper and lower limits, and the optimal in-between. The optimum may be different for each model, each model size, each filament. You need to develop a bit of a feeling for it, and that is best learned by closely watching it.
Having the same problem :
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