THIS CAN VULCANIZE THE FILAMENT IN THE EXTRUDER AND CAUSE A CLOG THAT RESULTS IN YOU HAVING TO REPLACE THE EXTRUDER NOZZLE BLOCK. IMPORTANT NOTE: NEVER USE THE STAND ALONE PREHEAT OPTION WHEN PVA IS LOADED IN AN EXTRUDER.
And in time, you'll get better at estimating how much you need. There is no special method of estimating this but having a little extra waste is better than losing a whole role due to moisture. If you're having trouble printing with the roll in the bag, then an alternative to this would be to cut off a length of PVA filament, making sure that you have enough for your print. ( The PVA filament comes in an vacuum seal, leave the seal intact until you are ready to print). This method reduces the amount of moisture that can come in contact with the PVA filament. Cut a hole in the bottom of the bag so that is fits on the spool holder. Let the end of the filament stick out of the bag, and try to close the bag as much as possible. When printing with PVA, put the PVA filament in a separate plastic bag with moisture absorbent silicone bags. Moisture can very easy destroy PVA, so always store it sealed in a air-tight, water-tight bag and in a dark, cool environment. The PVA filament is very sensitive for moisture because it is soluble in water therefore it always wants to attract moisture. PVA is soluble in water and is going to be used as support material.
Driver-unit fan installed (this is only a recommendation, not an absolute requirement.).
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