Print Head Drops between Towers

Hi,

I have a HE3D-Delta, a chinese reprap Delta printed based on the Kossel.

Read all the resources from [reprapandme.blogspot.sg] and [minow.blogspot.sg]

Results of my prints, following the orientation from Repetier,



Column C top of image,
Column A left of image,
Column B right of image.



tighter shot of print area between Column C and Column A



tighter shot of print are between Column C and Column B, the nozzle dips down into the bed.



Looking for pointers on what to do to fix the problem.

Is it the case that the print is symmetrical about a line that passes through tower A and the bed centre? If so, then I think you need to increase the delta radius firmware setting so as to get the nozzle height correct near the edge of the bed between towers B and C (i.e. the same height as it is in front of towers B and C), and then increase the tower A radius setting until you get the correct height both in front of tower A (after adjusting the endstop correction) and in the centre of the bed. Iterate as required.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].