This STL is designed to print a .3mm high disc at each of the 13 probe points of MHackney's Rostock Max bed.g script (pasted below with my own H values for deflection). You can print the pieces and measure their thickness with calipers or a micrometer to test your own accuracy.
Here is a description of how to use the H values for hotend deflection. http://reprap.org/wiki/Configuring_and_calibrating_a_delta_printer_using_the_dc42_fork_of_RepRapFirmware#Probing_by_pushing_the_bed_with_the_hotend
I've also attached a .txt file with GCode that you can use to position the head at Z5 above each probe point. Run the autocalibration first, then use the GCode to visit each probe point and manually jog down the Z height until you get a good smooth feeling drag on a piece of paper. Document that Z position for all 13 points, and incorporate them into the probing script to account for the deflection of your hotend at each point.
; Probe the bed and do 6- or 7-factor auto calibration
G30 P0 X-108.25 Y-62.50 H-0.25 Z-99999 ; X tower
G30 P1 X0.00 Y-125.00 H-0.1 Z-99999 ; between X-Y towers
G30 P2 X108.25 Y-62.50 H-0.07 Z-99999 ; Y tower
G30 P3 X108.25 Y62.50 H-0.03 Z-99999 ; between Y-Z towers
G30 P4 X0.00 Y125.00 H-0.25 Z-99999 ; Z tower
G30 P5 X-108.25 Y62.50 H-0.36 Z-99999 ; between Z-X towers
G30 P6 X-54.13 Y-31.25 H0.1 Z-99999 ; X tower
G30 P7 X0.00 Y-62.50 H0 Z-99999 ; between X-Y towers
G30 P8 X54.13 Y-31.25 H0 Z-99999 ; Y tower
G30 P9 X54.13 Y31.25 H-0.01 Z-99999 ; between Y-Z towers
G30 P10 X0.00 Y62.50 H0.2 Z-99999 ; Z tower
G30 P11 X-54.13 Y31.25 H-0.11 Z-99999 ; between Z-X towers
G30 P12 X0 Y0 Z-99999 S6 ; center and auto-calibrate 6 factors
I've also attached the RSDOC source file so that you can edit it as needed in DesignSpark.