Mixing Spatula Head. I needed for my hobby mixing and dissolving garden fertilizer. The stainless steel go for about AUD$30. A plactic/wood is find for me. Recommend printing in PETG, 0.3mm is good enough. TAKE CARE on slicer as the below is tapered. Zip-tie head to wooden dowell. I have made to 9.5mm dowell stick, but it can take smaller or larger. If you need modification, please message. 

-Update: instead of wooden dowell stick, I bought a bundle of bamboo-sticks for training plants for very cheap compared to dowel-stick. It is very strong. The put some drops of stuper-glue at the end of the bamboo stick and additionally where zip-ties. This will help seal the end and also fix stick to spatula. Attached are the updated photos.