Yes 10 sec worked much better. unfortunately the bolt I printed had a design problem that made it really weak. the hole for the hex wrench is way to deep and makes the whole bolt easily snap of. But using the nut on the rod I was unable to break it without using tools.
I will test with PLA also later. and have some nylon and PETG ordered.
Your problem is that with the bolts the layer time to print a layer will be very small, when ideally you want around 10 secs. As you set 3 secs. for your minimum layer time then the next layer will be printed before the previous layer has had time to cool and you will get, as you noted, a mess.
When you changed your minimum layer time to 10 secs. Cura then moved the printhead away from the bolt while it waited for the 10 secs. then moved back to the bolt and printed the next layer, and so on. It moves away so that if there is any dripping it will not drip on the bolt and also it takes the heat from the print head away so that the top layer can cool.
You have several solutions. For the bolt I would print multiple copies so that the total layer time is at least 10 secs. The problem with this solution is that Cura has a serious bug where the printing sequence of the multiple models is wrong. If you have four copies of the model, ABCD then the printing sequence is A,B,C,D then D,C,B,A then A,B,C,D etc. So B & C will be OK but A& D may not be.
Load you bolt into Cura and then select Tools/print all at one time. You want/need to spread the four bolts on the print bed to ensure you get a long enough layer print time.
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