Check chemical compatibility of your used materials before printing! No materials recommendations are given on purpose. Check the printing material, the used fluids and the samples to be inserted so that no unwanted reactions occur.
The wafers only touch the dipper at the edges, where the edge exclusion anyway limits the usefulness of the edge part. The bottom has a nice drain for the fluid to drain out.
The wafers are nicely fixed in the dipper. Accidental dropping of the wafers from the dipper is almost impossible.