gr5

The underextrusion issue - maybe your steps/mm is off. Check that - you can get to that through the memory system. Or recalibrate. having a print stop before finishing is...

Just to clarify - I'm 99% sure there are no underextrusion related bugs in 17.02. Either steps/mm is off or something just coincidentally happened unrelated to the firmware. Maybe look...

If you slice something with cura in "reprap" mode (in cura 15.X set machine to reprap mode) it will generate some gcodes at the top and bottom. You can use...

I recommend a factory reset. Some of the parameters stored in eeprom get messed up when you change versions as they are sometimes stored in a different location in the...

I have 17.10 and don't have any problems with underextrusion. Please post your issue on the UM forum and add @gr5 to the post to catch my attention (or send...

Again, this should be on the forum. Not here. I have only gen 1 boards. All my UM2 series printers (I have 4) are quite old. I suspect it was...

This happens to me also if I go into the TUNE menu and up the flow to a value > 100%. Did you do that? And if I set the...

So when it retracts 15cm and then unretracts 15cm - this is a VERY common symptom of when the arduino gets errors reading the SD card (or errors through the...

If you sit by the machine while it prints I'm pretty sure you will also notice it do the same thing in X and Y. But not Z. Best bet...

Try to measure (within 10 or 20%) how much it retracts. If it's a perfect even amount (10,20,30,40,50,60,70 ,80,90,100,200,300,400,500 etc) centimeters then it's most likely the problem I'm familiar with....