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Experimental

RestoMod Braun HL-1

Vintage Braun HL-1, restored with 3D modeling and 3D printing

This shroud/blade guard is meant to replace the clear plastic shroud of the iconic 1961 Braun Multiwind HL1 designed by Reinhold Weiss.

A beautiful, complete example in perfect condition is on display at the MoMA.

This is an homage piece, components initially created with the intent of restoring appearance and function to the original product; quite common with these, the plastic parts become cloudy and/or discolored due to decades of oxidation and UV exposure.

I have thus far been unable to restore clarity and color to the original plastic parts, and replacements in perfect condition are… nearly impossible to find.

The shroud is integral to the assembly of the item, so I created the part accurately enough to reproduce the actual part in a high-resolution transparent 3D printed resin, but the functional prototypes printed in bright colors result in a more visually-interesting piece. In a bright, opaque color, this becomes a more apparent sort of resto-mod.

In any event, I got carried away with the process and 3D-modeled the entire desktop fan, which opened opportunities to improve the geometry of the fan blade assembly as well… so that is also 3D printed.

This reference model is available for free download at grabcad.com

Drones

COVID-19 3M Facemask filter modification

It’s March 2020. The COVID-19 pandemic hits US shores and we are woefully under-prepared–my wife is a nurse in NYC and informs me they do not have enough of the correct face mask to prevent transmission of the virus to doctors, nurses, and clinical staff. Supplies are low, and replacements are unavailable or delayed. Not only this–alternatives of the same or similar level of filtration are unavailable as well, due to the medical shortage. Let’s get to work.

Exploded view of the mounting adapter and filtration cartridge:

These 3D-printed parts can make an old, inadequate respirator safe for use in a high-contact, high-exposure setting using a commonly available item as filtration media.

Alternatively, should a limited supply of n95 masks be available, this system could stretch the supply substantially. By cutting up the donor mask, theoretically, the material from one mask could be used to protect as many as eight people.

Files have been updated; now these cartridges are compatible with disposable 3M respirators, standard 3M respirators AND standard MSA respirators.

Mask used: 3M 5201 Disposable Half Face Respirator
Filtration medium used: Cotton Rounds

I have made these parts open source and they are available for free download at grabcad.com and thingiverse right now.

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