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05SRT4:
Whats the layer height set too? I usually start with .2 mm.

Sounds like the firmware might be having issues, could always flash it with the latest version.

Also does it do the same thing on the 3rd layer?

BadMouth:
Post a screen grab of your cura settings.
(the ones on the left of where the model is displayed.)

If it is the settings and not a hardware issue, it could be that the layer height is set to something crazy high.
It has separate settings for the first layer height and following layer heights.

EDIT: was posting same time as 05SRT4....we're thinking along the same lines.

BadMouth:
Only did a cursory search, but .....
http://shop.prusa3d.com/forum/original-prusa-i3-mk2-f23/cura-print-settings-t999.html

--- Quote ---DO NOT USE CURA 2.1.X, IT DOESN'T WORK

--- End quote ---

SammyWI:
I've never had the layer height jumping issue but I would not be surprised if the installed firmware was corrupted. I'm pretty sure mine was as it would not accept an auto level command and would not communicate temperatures with Octoprint. Flashing to the Skynet firmware fixed both. Not sure if still true but when I flashed there was no original firmware files available so a flash to Skynet was one way.

ETA: After some searching I see a lot of people say the included SD card is crap and can cause this. Using a different card seems to fix it. Also the filament loading is tricky but after a few times it gets pretty easy. Straighten out the end of the filament and you'll need to get used to where that tube is that you need to hit. I also replaced the socket head screw they used for the part you have to press on with a hex head so that my thumb has a more comfortable piece to press on.

Howard_Casto:
Ok, to reply.

I'm using Cura 14.7, which is what the documentation recommends. The layer height is 0.2mm. Tried with a different sd card... it didn't help. I tried a rep-rap stl file of the maker bot mascot and things got weird. First time it just set at idle and did do nothing, the next time it make noises like the printer was moving and the percentage meter went up, but nothing happened. Then I tried two of the models I tried earlier... they are still doing the same thing. The printer is acting weird.... like when I browse files I can hear the fan ramping up as I go through the menu. Can Skynet be configured to not use auto level? I need to print the sensor bracket before I buy the sensor.

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