Finished print, with one 2" sapphire wafer inserted.
Device data
Manufacturing files
Software license [ ]
Hardware license [ ]
Project data
Authors Christoffer Kauppinen
Status Prototyped
Made? Yes
Replicated? No
Cost EUR $ 100
Uses education, academic research
Export to Open Know How Manifest
Page data
Type Device, Project
Keywords 3D printing, chemistry equipment, wafer dipper, filament
SDGs Sustainable Development Goals SDG04 Quality education
Authors Christoffer Kauppinen
Kathy Nativi
Published 2017
License CC BY-SA 4.0
Affiliations Category:Aalto University
Language English (en)
Page views 592
Location data
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Location Aalto University, Finland

Motivation for this project is that outside industruial semiconductor production the processed wafer quantities are small. In academia it is common to process 1-3 wafers at a time. Therefore wet etching and other dipping is often done in a beaker. It is quite difficult to find small dippers for 2 inch wafers that fit into a standard 250 ml beaker.

This 2 inch wafer dipper is designed to fit into a 250 ml Schott Duran beaker. Number of wafers that can be fitted are automatically calculated and taken into account. The user needs to think only the size of his or her beaker and ofcourse the wafer dimensions.

The design can be found here: Parametric wafer dipper

Designer[edit | edit source]

Christoffer Kauppinen

Aalto University, Department of Electronics and Nanoengineering

Design[edit | edit source]

The design can be found here: Parametric wafer dipper

The code is parametric and the comments should be enought to edit the design as one wishes.

I recommend printing the dipper upright. The Lulzbot TAZ6 printed this one nicely.

CAD images[edit | edit source]

Notes on the design[edit | edit source]

The dipper fits just right.

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. This feature is often overlooked in commercial dippers.
  • The wafers are nicely fixed in the dipper, from the sides and the bottom. Accidental dropping of the wafers from the dipper is almost impossible.

Savings per print[edit | edit source]

Now this is a difficult number to give as I have not found similar dippers. A Korean supplier says the price is roughly ~260€ for a 2" Teflon dipper. As the design presented in this wiki is customized, at least same price can be used for savings calculations, assuming the used material isa similar to Teflon.

With 100% fill 3.8 m of 2.85 mm filament is required. The chosen material affects the savings, but assuming a very bad case where the print requires one whole spool of 1.75mm FEP filament which cost ~100€, the savings are at least ~160€/print.