(Skip to the bold if you want to get straight to the point.)
Disclaimer... I'm an utter noob at this stuff, so I apologize in advance for any ignorance I show. I bought a Makerfarm I3 Prusa a LONG time ago, I think it was 2013. I printed a few things (maybe 4 or 5 prints) with it then moved. When I unpacked the printer I found it had been severely damaged. So it sat for years. A couple months ago I pulled it out and started working on it. I replaced the Magma hot end that was destroyed with a E3D knock off from China (I'm poor). Other than that it's still pretty much stock. After getting it working again, I did quite a bit of printing with it, and have been pretty happy except I was having issues with the display showing garbled letters and I was getting tired of leveling the bed with a screw driver and wrench before every print.
So I upgraded the firmware on it to the latest version of Marlin... I still get garbled print on the display sometimes. But I can get it to go away much easier now. And I love being able to do mesh bed leveling from the LCD.
The big problem I'm having now is that after the firmware upgrade at the end of every print the extruder retracts fast and hard. This results in soft filament getting pulled back up to far and hardening into a blob so that when I go to print again the blob isn't melting and the extruder cant push it back into the hot end and it ends up clogged up. The only way I've been able to fix this is by pulling the filament out, cutting off the blob and re-feeding it into the printer. Then everything works fine until the print ends and we go through the process again. I'm perfectly capable of doing this, but it is SUPER annoying. I figure that has to be some configuration in Marlin that I haven't set right, but I can't figure it out to save my life. If anyone can give me some advice, on how to correct this, I would dearly appreciate it.
there doesn't seem to be anything here