Here’s my issue:
Stock Taz 4 w/ fan
edit: stock Lulzbot PLA slic3r medium speed settings
PLA jams during hours-long print EVERY TIME.
The “cold” upper bit of the hot end is brand-your-skin hot.
Extruder motor pretty hot.
Hobbed bolt is relatively cool.
Worse with cheap PLA, better with quality PLA, but ALWAYS.
PLA is wedged in hot end and difficult to extract.
To install an auxiliary fan, dedicated to keeping the heat sink sunk.
I don’t need to control it with Slic3r - if I have to, I’ll just put a switch on it or have it always be on.
Bonus points for independent software control.
Where should I tap into power on the RAMBo board for a second independent fan?
For the time being, I am just going quick and dirty with a 12V wall wart.
(Please don’t tell me to print faster - I want the quality of a slower print. That is a kludge; I want a solution.)
Editorial / background:
I have given up on the possibility of printing ABS with the Taz 4.
The hot bed is useless for maintaining a warm printing envelope.
ABS is completely unprintable on this machine without horrid curling/ warping.
Even in a box. Even with a fox. PET is garbage,
My metric is a $700 printrbot kit that has consistently kicks my Taz’ butt when printing ABS.
I have high but reasonable standards for print quality, as I print my designs and sell them to paying customers.