sh5
thingiverse
Download the free file directly from the web. The compact assortment of coffins is comprised of 4mm thick material. I believe the design requires some tweaking to suit your requirements. They were not precision-cut by me.
Download Model from thingiverse
With this file you will be able to print sh5 with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on sh5.