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JPChauvel

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  1. So I’ve had my UM3 for a few weeks now and love it but have had a few clogs using the PVA material in the BB 0.4 print core. This became exceptionally annoying when printing something like Gyro the Dodo which takes days. One thing I noticed when the core clogs is that the PVA turns from a more translucent white color to a more opaque yellow and sometimes even brown color, clogging the nozzle and turning the PVA into an almost sandy grit. So I decided to look into the chemical properties of PVA and to my surprise I found that partially hydrolysed (reacted with water from the air) PVA will begin
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