A friend of mine gifted me with a spool of metallic flaked PETG to print up a few figures for him. This was several months back. I got one good print from it of a Deathclaw (http://www.thingiverse.com/thing:1313334) and since then I've been avoiding using it because of continual bad prints. I decided yesterday to give it another shot cuz I don't want a kilo of this stuff going to waste.
Initially, I was getting rough prints and PITA support removal, but it's gotten worse. When I begin a print, the initial front extrude (the brim) lays down fine, but as soon as it starts laying down the object, I hear clicking as if the extruder gears are slipping and nothing wants to stick to the build plate. Eventually the nozzle gums up and I have to disassemble the print head to clean it out.
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Things I've tried to fix the problem:
- re-level the build plate
- slow the print down (tried between 15mm p/sec and 40)
- change the nozzle temp (tried between 230 and 250)
- offset the z-axis (by as much as .2mm)
I don't believe it to be the model I'm trying to print because I've tried several including the basic 20mm cube. Unless the temp and speed are hard wired for the first brim, I don't suspect it's either of those settings, since that lays down fine every time. I'm almost certain it's not the bed level either because my ABS prints (on the right right nozzle) come out great. If anyone has had a pleasant experience with this material, I'd love to take a look at your settings. I'm using makerbot desktop, but any program's general settings might be helpful.
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The only thing I haven't tried is feeding the PETG through the other nozzle, but I need to get some things printed before work tomorrow prior to troublehsooting further.