Finished print, with one 2" sapphire wafer inserted.
FA info icon.svg Angle down icon.svg Device data
Manufacturing files
Hardware license CERN-OHL-S
Certifications Start OSHWA certification
FA info icon.svg Angle down icon.svg Project data
Authors Christoffer Kauppinen
Location Aalto University, Finland
Status Prototyped
Made Yes
Replicated No
Cost EUR 100
Uses education, academic research
OKH Manifest Download

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.

FA info icon.svg Angle down icon.svg Page data
Keywords 3d printing, chemistry equipment, wafer dipper, filament
SDG SDG04 Quality education
Authors Christoffer Kauppinen
License CC-BY-SA-4.0
Organizations Category:Aalto University, L3999
Language English (en)
Related subpages, pages link here
Aliases Actually Functional 2" Wafer Dipper for Schott Duran 250 ml beaker
Impact 869 page views
Created October 25, 2017 by Christoffer Kauppinen
Modified January 29, 2024 by Felipe Schenone
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