Customized version of http://www.thingiverse.com/thing:243650

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=243650

Using the following options:

box_shape = 1
tolerance = .5
custom_shape = [[[-40.136986301369866,6.164383561643835],[-38.76712328767123,6.164383561643835],[-37.397260273972606,6.164383561643835],[-34.657534246575345,6.438356164383562],[-29.726027397260275,6.438356164383562],[-28.356164383561644,6.438356164383562],[-26.986301369863014,6.712328767123288],[-25.068493150684933,6.712328767123288],[-23.698630136986303,6.164383561643835],[-22.054794520547947,6.164383561643835],[-20.410958904109588,6.164383561643835],[-17.397260273972602,6.164383561643835],[-12.73972602739726,6.164383561643835],[-8.082191780821917,6.164383561643835],[-3.4246575342465753,6.164383561643835],[1.2328767123287672,6.164383561643835],[5.342465753424658,6.164383561643835],[8.904109589041095,6.164383561643835],[11.917808219178081,6.164383561643835],[14.383561643835616,6.164383561643835],[16.027397260273972,6.164383561643835],[-14.931506849315069,-34.38356164383561]],[[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]]]
box_top_height = 10
box_height = 20
box_maximum_length_or_width = 60
build_plate_selector = 0