I have some input as well!
I have been building my mpcnc for the last week when the hardware was received from your shop.
The workspace is 600x580mm, and so far i havent mounted a spindle yet, ive had a looot of tests with my pen
I made a simple piece to draw, just a square 120x120mm with a circle in the center with a 100mm diameter, just so its easy to measure, and to see if eg. the circle wouldn’t fully draw a closed circle.
I drew this model 20 times, and with measuring the 4 sides of the square, and the diameter in two places of the circle, i had a possible result of 6 out of 6.
So 20x6 = 120 measurements.
The “failure rate” was 34,1% with the maximum alternation being ±2mm.
18,3% ±1mm, 15,8% ±2mm, 65,9% perfection.
-But again, its drawing on paper, and even tho i taped it on the workspace the paper might still have had some bulges here and there, and the worksurface isnt perfectly smooth, so it might be a poor way of testing the accuracy, atleast for me. Tommorrow, ill try an find a nice plate, and just clamp it on, so that it eliminates the “worksurface-roughness” as a possible factor.
My build is the standard build, all hardware is from the shop, i printed the plastic myself with no problems whatsoever, the conduit is 25mm with an outer wall of amazing 5mm!
Theres 3 things i changed, or added… The toolmount is screwed into the Z-axis conduit, i drilled the holes, and cut rivets in it, so i could screw the toolmount directly on the conduit, with the outer walls being so thick, it would be impossible to have a nut trap in there
And then i put a thin piece of aluminum across from the Y-axis gantrys, to support a cablechain with the cables from the Z-axis motor.
I feel that my gantrys are a bit loose on the conduit, like one side could be a millimeter further down the rail than the other one , and im afraid that one might always be a tat being the other half of the pair. They are turning the same amount and at the same times, but still, if im moving them into 0,0,0. It might be dodging them a bit, and then the piece would end messed up anyway.
All legs are the same height, everything is square. Im just afraid, when i get to the milling part, that when the middle assembly is around the middle moving around, one gantry will be forced a bit further down the rail, than the opposite side. Ofc, by turning down the moving speed of the system, would remove more material slower while moving, and therefore ensure that theres isnt too much resistance between the spindle and the piece, when moving.