Here is my 2 cents on abs printing. First the fan issue with snapmaker. Not sure if the newest firmware has resolved this issue the fan us much to robust for printing ABS parts I suggest you make one of the cooling shrouds that many of the good folks have created. The next thing I would do for printing ABS is get rid of the snapmaker printing pad. It is far too to thick an does not let the heat bed temp get to where it needs to be. Use blue painters tape with a small film of blue glue stick on the top.