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My Ramps polyfuses have worked great for months.

Should not be flexible. I printed rock hard Wades gears from PETG.

Sorry for the delay. I have all the pics but lack to time to post them. Hope to get them up soon.

I ordered a second printer, and it's still in the box. They were changing the LCD to a slightly...

Aluminum is an interesting option. Maybe someone will start selling them. I guess it would need to be a hollow frame to keep the weight down.

Mine are currently PLA, but I want to make them PETG....

If the rounded part is where it changes layers, might need retracting there.

I think I saw this on another forum. Your Vibration Limit is set to 5. Change it to zero.

Seems like you should be able to just use Esteps. Or, after each print starts, use the LCD menu to adjust flow.

I have the E3Dlite6 and it works great. Low cost.

Print 20 mm cubes first, and get them correct before moving on.

Glass bed
PETG
Cold pulls
Not too strong idler tension

Every 20 or every 40? And is the band on those layers? If so then something with the solid layer is causing it.

Knowing black PETG, and knowing that lower temps reduce the gloss, I'd say that the...

Does the band height correspond to a certain number of Z rod rotations?

Also the endstop could have triggered at the wrong place.

Sounds like the endstop switch is failing or is being triggered by electrical noise.

More pics....

This corresponds to Createc's video for the Z axis:

https://www.youtube.com/watch?v=SjYbHEGWtPI

Remember you are using the black steel X pieces; not the blue plastic ones in the video. Other...

Then that sounds like a mis-aligned part in the hotend. Maybe the nozzle is not seated properly.

Sounds like a basic clogged nozzle, but you say you replaced it with the hot end?

If the thermal runaway is enabled, that might be triggering it.

How would a wobbly nozzle cause such under-extrusion?

Fortunately I figured this out before buying one; the black acrylic China ones looked great though. My choice of the Createc steel i3 seems good... I even let part of the frame hang off the table to...

Bed gap looks too high. On other prints the extrusion has time to "catch" on the bed and start printing, but on these holes it has to re-catch each hole, and it does not have time. So a smaller gap...

I don't think Z backlash is a problem, because the weight of the X always pushes down on the Z nut.

I had jamming too from too much retraction. Caused a flattening of the filament which got stuck in the pathway to the nozzle. Solution was to use only one of the two springs that holds the idler to...

Wish I could help. However, I do use Slic3r 1.2.9 as my first slicer and it's working good.

And some more X pics:

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