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Where do you get your filament from?

Try moving the machine. There is a possibility of a draft.

My experience with an older solidoodle has not been positive. Whether that translates to the 4, I cannot say.

In general, features close to the size of your nozzle are approaching the limits of the machine's resolution. An SLA printer like the Form 1 can do much higher resolution prints, however the resin is...

That EZ3D doesn't look very sturdy. I don't know man. I've found I can only recommend printers I've actually worked with, and I haven't seen that one before.

They do output particulate matter, but I think as long as you have good ventilation it isn't a big issue.

I've had very good experiences with the lulzbot, and the TAZ 4 is very well built.

I'd be inclined to direct you to a Prusa i3 kit at that price.

Then the display on the front panel has been lying to me...

I can double check next time I'm in the lab, but I'm pretty sure it's 230.

That looks like a slightly bent leadscrew. As the screw rotates, it causes the table to wobble. I'll wager the pattern of bumps lines up well with the threads.

Off hand, the only machine I know with that kind of print volume is a lulzbot. Mind, something that big will take a long time to print. You will need to use a pretty high infill to get the durability...

Personally, I'm a big fan of lulzbot. The TAZ 4 is very nicely built. I've found reliably printing with layer heights below 0.2mm is very difficult, if the ABS isn't being fed fast enough the...

They haven't run g-code for quite some time.

I've seen screwy temperature stuff before on a Makerbot. I think your machine might have a hardware problem. I think sometimes the thermocouple amplifier dies. Using a thermocouple in this...

Forget all this stuff, I know of one killer feature they absolutely must​ add. Make it print.

I just wanted to point out that the high end Stratasys FDM machines heat the entire build chamber to 230C. The Fortus 400 is built like an oven inside.

I have an idea for a possible fix for the extruder. The upper extruder is almost entirely enclosed, I think that the fan which blows air on the hot end fins is only creating a recirculating air...

That is very different. How long has it been doing that?