circle test for level of delta/ prusa print bed. use filament or marker. only 1 z level high

thingiverse

this was designed for those requesting pen tests or filament test of printers, for level operation and calibration. either use gcode directly or compile your own from stl, or openscad that is included. prints 1 layer high for pens/or filament level testing of bed. use delta version on deltas and prusa_mendel version cartesian normaler print variants. in work in progress until more people test it. it still moves extruder in the gcode. so it needs to not be loaded with feedstock, or the printer should be up to temp already.