This is a 3D Printed Wool comb that you can use to process wool before spinning it into thread. It uses 16d 3.5 inch nails as the tines.

Here is an Amazon Affiliate link for nails of the appropriate size. https://www.amazon.com/HILLMAN-FASTENERS-461364-Common-Nail/dp/B00YUWLHJM?dchild=1&keywords=hillman+fasteners+bright+common+nails+16d&qid=1620749016&sr=8-2&linkCode=sl1&tag=goodandbasi07-20&linkId=6647ea2e094c551798ddaa36ec1d4be7&language=en_US&ref_=as_li_ss_tl

Print 2 of the file, and tap all the nails into the holes at the front (it is a tight fit) with a hammer.

I also sell these on Etsy. Here's a link to my shop. https://www.etsy.com/listing/1007135779/wool-combs-kit-3d-printed?ref=shop_home_recs_2&crt=1