Hi gr5,
Thanks a lot for your suggestions. I have set the retraction speed down to 1mm. The travel speed has been cranked up to 250mm/sec. I am gonna printed more this morning.
Some guys said the initial layer speed should be lower but you suggested to printed with constant speed. What's the reason behind it?
BTW, I saw many people suggested that the color dye will absorb water severely but the natural ABS is fine. I thought the little pits are caused by the evaporated moisture.
Thanks again.
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gr5 2,295
You shouldn't have to ever dry out ABS or PLA. Only nylon and pva. I have 6 year ABS that still works great. Not kept sealed up.
Enclosing the printer is good for ABS. That was a good idea.
Your retraction distance is huge (6.5mm) and that could be the problem right there. How far between your extruder and your hot end? Isn't the extruder mounted on the print head? I'm going to guess around 30mm. You typically want about 5mm retraction per meter of distance between these 2 devices so you probably don't want to go over 1mm retraction. UM printers have about a 1 meter tube between the feeder and the extruder so UM printers need typically 4.5mm retraction. Not sure about your A8.
Make all the print speeds the same. Don't have one at 15 and the other at 10. Look at all the printing speeds and try setting them all to 20 if you want it to print slow and high quality.
And your travel speed you want to crank it up. If it travels too slow you get more stringing, more pits and blobs. 150mm/sec is usually fine but 300mm/sec is reasonable as well. I suspect the A8 can do 300mm/sec just fine.
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