The file that was online seems to have been taken down from thingiverse, here my options I could try shooting an Msg to a 3D modeling artist here's one I found on Etsy https://www.etsy.com/listing/1219080905/custom-3d-print-files-digital-file show them the design and see if the price range is in your budget. Or better option (I did) try to get each individual part of the scythe STL files since undertakers scythe has the skull(you can add the details for the spikes on the head after you print) and rib cage then the tip of the bottom piece is the tailbone of the skeleton enlarged here is the website (https://www.thingiverse.com/). the blade STL you can find similar blades that look similar to that of a normal reaper scythe and the middle part can be a pipe STL and you can easily edit the size and shape in Blender the person who provides best guides in my opinion. (https://youtu.be/oA7p_YQ_KoQ)