On 9/18/2018 at 11:44 AM, gr5 said:To print peek and ultem you really need the bed to get up to 160C. This is the bigger issue for converting. You also need the air temp around 80C which is bad for the steppers so you need to keep the steppers cool somehow (enclose them away from the hot air and add air or water cooling perhaps). The core's themselves probably don't really need any modification. I've heard that the 350C limit is more for the head itself than for the cores. Something in the head gets too hot if you have two cores at 350C I suspect. c-coat may indeed help on this last aspect (keep the heat in the brass block where it belongs).
Ultem needs a higher bed temp than that, but PEEK is fine at 140˚C bed temp. Oddly, Ultem doesn't need as high of a nozzle temperature as PEEK. I've printed both below 350˚C, as low as 330˚C, but that was mostly smaller sections, suggesting slower speeds will work until you unlock the temperature limiter.
Edited by JRDM
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gr5 2,224
To print peek and ultem you really need the bed to get up to 160C. This is the bigger issue for converting. You also need the air temp around 80C which is bad for the steppers so you need to keep the steppers cool somehow (enclose them away from the hot air and add air or water cooling perhaps). The core's themselves probably don't really need any modification. I've heard that the 350C limit is more for the head itself than for the cores. Something in the head gets too hot if you have two cores at 350C I suspect. c-coat may indeed help on this last aspect (keep the heat in the brass block where it belongs).
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Timothy_Egoroff 0
Thank you for your comment gr5, this is only for printing smaller parts for me that is , but for other users who aren't afraid of further modification, C-Coat is further used to insulate the walls (sides back and bottom at 1-1.5mm thickness) to prevent any steppers or other electronics from over-heating, also the bottom of the heat bed should be coated to trap heat so only the top can emit thermal energy into the printed part, this may allow an increase of over 1.8 times the total highest temperature limit if a thick coating is applied. so hot plate (modified) should reach required temp, and air should stay hot without exerting heat on steppers... i aught to try it now.
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