Geeetech

This is my 1st 3D Printer, and while doing research, come along advise to use an external mosfet to power the heatbed. Finally got mine from Aliexpress https://www.aliexpress.com/item/Hot-selling-3D-Printer-Parts-Heating-Controller-MKS-MOSFET-for-Heat-Bed-Extruder-MOS-Module-Exceed/32837727069.html?...

Got some from China, 4 x TMC2100 v1.3 And keep skipping steps on Y-axis and also my extruder. Have followed various guides, but most contradict each other, and the config sheet the suppliers gave me doesn't seem to work with my brain!! [attachment=0]HTB1mlmJo9tYBeNjSspk762U8VXab.png[/attachment] Hav...

reading this now: http://forums.reprap.org/read.php?219,533688,539308
and it says "For ANY NPN sensor resistors are not needed."

VERY HELPFUL ( DEAD LINK) !!

I have same, and have found a thingiverse entry which has recovered my gt2560 clone.
https://www.thingiverse.com/thing:2284225

Got a replacement board and works fine. Turn out board is a clone 2650, no GT logo, so could be Biqu. Everything on board idebntical though. As board is Rev. A, no touch sensor 3-pin socket. Also how do i tell if it has a bootloader or not installed? I'm guessing not. Have checked chip is ATmega 256...

Turns out board on my CTC is a Geeetech clone, so problems when you try to install other Fw.
Will just buy genuine, as soon as i start my first bactch of upgrades...

[quote=_kaktus_ post_id=82981 time=1520263333 user_id=62475] Each development environment for µC AVR allows reading the code from μC. But only if μC is not protected against such activities. (configuration of fuse bits) I think that you can backup flash memory and eeprom on your own. ;-) kaktus [/qu...

In which case here are default setting as taken from fresh replacement board, for my CTC i3 pro B Reprap: Note: All standard, with MK3B Dual power Heatbed, direct drive extruder, and plywood frame, also GT2560 Rev A (not A+). Acc: 1400 Vxy Jerk: 13 Vz Jerk: 0.30 Ve Jerk: 5 Vmax x: 400 Vmax y: 400 Vm...

CTC supply a very simple plastic extruder which is not adjustable, and it has problems holding filament to feed.
Have ordered bowden extruder and e3d v6 clone, so hopefully will be ok.

Others have said original extruder is bad.