I have just bought an EleksDraw from Banggood. Having assembled it, I realised that the pen carriage is only held by 2 screws into the brass runners through the end of the Y carriage. This allows the pen to move if either of the 2 screws become loose Thus, the axes will not repeat accurately. This meant I've had to modify the carriage, as others have done, or check the pen tightness before every plot. My immediate solution, has been to drill 2 more holes on the end of the Y carriage, in line with the other ends of the brass slides and fix with 2 more screws. The other thing I noticed and found a useful help over was: the sticking of the carriage bearings, if you over tighten the 6 screws on the top of the carriage plate. If you push the carriage up and down by hand, when the motors are powered off, you should feel any 'sticking' or resistance along the movement. Obviously, such resistance, in places, will cause missed steps. After these 'mechanical' checks, you could then look at electrics and control.
Another accuracy test to try. See if you can get a drawing of a matrix grid, across the maximum drawing area and look for distortions to the squares. Then, concentric circles, that will use angular motion across 2 axes. If these tests work well, at least once, or a few times but degrade over time, it strongly suggests mechanical 'movement'. Hope this helps.
@nandalek It's because your firmware is set for Cartesian and it needs to be changed to CoreXY, as I said this is a menu click in T2Laser but I have no idea if you are using other software.
The laser max should also be limited to prevent the servo getting over-driven and stripping it's plastic gears, this is done automatically by T2Laser but you probably have to manually set it for other software.
I don't know how you do it with EleksCam but with T2Laser you just select the menu and click EleksDraw and it will set everything correctly including the "laser max" to prevent over driving the servo and stripping gears.
i havent got a clue what you are talking about. grbl is what all eleksdraw, elekslaser, and eleksmill machines use. The nano is the only thing you can load anything on. The control board is just a way to direct that information out to the stepper drivers and servo. I think you have your terms all mixed up.
I can't tell, but from your photo it looks like your whole pen assembly is too close to the drawing surface. I just measured mine, and from the bottom of the white kind of T-shaped piece to the drawing surface is about 36mm.
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