I'm very novice with Selpic Star-A or printing in general. Actually I'm trying to get my first model printed, after "the vase".
I had very bad constant shift on x-axis: 11mm per 8mm of z-axis for a wall that should be straight along y and z.
From bottom up the three layers/steps (paused, drove home between them) are:
1. Device assembled as instructed, except:
- extra belt head inside printing head cut away
- cardboard box of 1kg spool, 2 holes cut and felt pen pushed through works as spool holder
2. Cable sleeve moved so that it doesn't go behind vertical rods, but partially lays on floor on left of the main structure
3. I cut the filament from spool, allowing about 20cm to stand/swing on air
My preliminary conclusion is that major problem is to drag the filament away from spool. Reasons can be inertia of the 1kg wheel or it's sides being dragged against cardboard. To mitigate the first, I guess either smaller spool or slower x-motion or acceleration would help, for latter a better spool holder.
To be continued whenever wifey allows... 🙂