Try carefully washing the surface with dishwashing soap, rinse and dry before next print. That spot might have something not visible on it that prevents filament from sticking. Grease, dust or residues from some filaments tend to cause that.
0.2mm flatness is very flat for a 3D Printer bed, I don't even know if I achieved that with the Nylock mod on my old Prusa. This simply looks like a bed adhesion problem, clean your bed well with dish soap and water and then rinse well and make sure you don't toch the surface. Check the first layer height and bed temp as well.
I noticed something while printing. it doesnt have a bed mesh loaded when it prints. it saves the last mesh, but doesnt load it. why?
I think that was a change made a few years ago by the klipper devs. You'll need to load the bed mesh explicitly in your print start macro before printing
should I have it remesh each time, save, then load the mesh at the start of each print or should I just have it recall a saved mesh?
I feel you OP. I have a Hypercube Evo that I can't for the life of me get a leveled bed with. I've swapped linear rails with MGN, switched to multiple probes including a beacon that I still need to install but probably won't help seeing this post.
I think your frame isn't straight, there's twist somewhere that combined with an offset from probe to nozzle means it's impossible to remove with probing as the offset in Z between nozzle and probe changes over X and/or Y. That's the only thing I can think of at this point.
Where could that twist be?
My guess would be from one side of the x-axis to the other, because then on one side the nozzle to probe offset would be less in Z then on the other. But it could also be anywhere else. Can you check if your frame is square?
I am constantly manually tweaking Z offset at the start of prints so here's hoping the heatsoak solves that.
Do you have a single MGN rail on X or two? It's easy to end up with twist on dual X rails that can be a bugger to try to straighten out.
Also, are you doing a good heat soak before printing, and do your probe results change at all before and after heat soaks?
If you've got a beacon on there, it seems like it would be well worth cranking the probe points way up.
If it's simply bed adhesion, definitely give the dish soap method a try if you haven't already.
cranked up the mesh points and switched from lagrange mesh to bicubic. here we are at 35x25 points. weird, I see spikes.
Oh and to answer your question, there is one linear rail on the X axis.
You have a lot of possible options here.
If everything is ok, as someone else said, it's maybe a X twist -> https://docs.vorondesign.com/community/troubleshooting/bryansj/twisted_x_extrusion_diagnostics.html
I have reworked the start_print gcode macro to incorporate a heat soak before scanning for a mesh. While its running that 20 minute soak, I notice that the temperature reading on the beacon coil is actual dropping while everything else is increasing during the soak. Is just above the bed, in the center, doors closed, and its readings are getting steadily lower. What could possibly cause that?
EDIT: Here's where I ended up with my printer.cfg file for my 300 mm^3 voron trident. Do you see anything suspicious? https://pastebin.com/AxxEypK4
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