Mk7 replacement with cooling fan
by hansj66, published
After printing with ABS for a year, I decided to give PLA a try. The extruder nozzle clogged on almost every print, so I decided to attempt to add some additional cooling.
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I experimented with temperatures in the 190 degree ballpark (HBP at 50). The higher the extrusion temperature, the harder it will be to prevent heat propagating back up into the extruder. With the fan active, I managed to print a 15 x 20 x 18 cm big Xenobird (http://www.thingiverse.com/thi... without any problems, but I still always had to pull out the filament, cut it and then reinserted it before each print to avoid it clogging. In my case, clogging will always happen if I start a new print with PLA that has melted and then been reheated in the nozzle.
You can see the result here: http://www.timeexpander.com/wo.... It is printed in clear PLA and finished in latex paint.
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Spring dimension is probably not critical. The spring I used is 8 mm in diameter and 35 mm long.
The fan is a standard PC power supply fan.
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