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Actually Functional 2" Wafer Dipper for Schott Duran 250 ml beaker

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Revision as of 14:09, 25 October 2017 by Toffe (Talk | Contributions) (Savings per print)

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Finished print, with one 2" sapphire wafer inserted.

The design can be found here: Parametric wafer dipper

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.

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.


Christoffer Kauppinen' Aalto University, Department of Electronics and Nanoengineering

Design and use

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

Design notes

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.

The dipper fits just right.

Savings per print

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 custom design so at least same price can be calculated if made from similar material as 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 as ~160€/print.