As i learn more about the subject I have more questions than answers The drivers seem to use 0.1 ohm resistors, so the Vref values I measure would translate to roughly 1A max. I have the small heatsinks installed, no active cooling though. Shall I try to raise Vref to 1.2V (1.5A) and test repeatability of z positioning again ?by charliefd - Delta Machines
The rods are glued in at the factory using a jig, i expect them to be fairly equal length. The plastic Carriages have lots of flex and they don't inspire "precision" at all. I've order some rails and carriages and will replace the profile riding carriages with rails. It is disappointing not to be able to print even close to true with the factory supplied components. Thank you for pointing me soby charliefd - Delta Machines
I measured the Vref on the drivers and they are already set at the maximum current of the drivers: I found Vref values of 0.8252 / 0.8386 / 0.8127 V on the 3 towers. This translates in 2A on each stepper, practically the upper limit of the driver (A4988) if i read the docs correctly. The motors are not marked in any way but it is a good probability (from the anycubic p/n found online) that theyby charliefd - Delta Machines
I'm adding the results of the circle test: A 40mm diameter circle gets printed 40.7mm on Y and 41.04mm on Xby charliefd - Delta Machines
Hi! I'm new to this, obviously, and my first build is the assembly of an older "kit" from anycubic called kossel k2 (a delta with 20x20 framing profiles and 180mm max printing diameter). It uses carriages running on the tower profiles (no linear motion rails) The build feels mechanically sound with several observations: 1. one of the rods is "notchy" in its movement 2. the guiding wheels on thby charliefd - Delta Machines
I know this is an old thread but I've just had the same issue with inconsistency of the Z height on repeated returns to the same "spot". I'm a complete newbie on my first build but I'm learning fast. I took one of the suggestions above and tightened the belts: that improved the consistency to within 0.15mm. Funny enough is the same model of printer as the original poster has (or had). I'veby charliefd - Delta Machines