Dangerous Ladies' 3D models for Breast Forms!
Model by Jennifer Rezny (@quicksparrows)

.stl format. What an interesting file! Let me give you a tour.

This file set includes 3D printable breast forms for 13 underwire sizes loosely corresponding to A through H; what size works best for you will vary because, for example, a 32H and 46H are entirely different sizes despite both being "H" cups. (Your cup size is, generally, the difference in chest circumference to underbust circumference, but it gets complicated and I'm not going to talk your ear off here. Go to /r/abrathatfits if you want the whole bra science spiel.) The breast shape is generally high, rounded and firm; this is because most anime and video game characters have very perky breasts, but if you are a person with low breasts, you may find that armour you sculpt on this will need to be worn with a push-up or some padding (even if it's the right wire size!) because the shape is rounder or more voluminous.

To find your size, simply take your best fitting underwire bra and measure between the two tips of the underwire, and then find that number on this chart. If you do not have an underwire bra, please consult the included chart for a rough idea of what bra sizes correspond to wire sizes:
https://www.brabuilders.com/pages/underwire-sizing

If you do not own a bra period, try using a bra measuring tool to determine what bra you would be. Worst case scenario, simply print whatever one feels right, see if you like it, and then print another. That's the fun of all sizes being included.
https://www.abrathatfits.org/calculator.php

If you do not currently have breasts and do not even know where to start, use the calculator above anyway to find your band size, and then pick the cup size you'd like. Or, if you'd like to throw all caution to the wind and see where you end up, just look at the renders provided until you've decided what size of breasts you want to give yourself. It's 2024, you can give yourself big[ger] knockers for like $10 in filament.

You can use these for a variety of different purposes, including:
- padding out your dress form
- making a sculpting buck for shaping foam, worbla and other materials on
- patterning a "ham" to iron with

For some of these you will need to treat the 3D print in various ways so it does not melt or get deformed. I will go into those below.

ALSO IMPORTANT: I may periodically add new files to this listing. If you've purchased it once, you'll get emails whenever we upload a new version. If there is something particularly useful you'd like added, please let me know and I'll consider it.

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This file includes a couple variants, all in 12 sizes:

BASIC FORM: This is just a breast. I suggest this for sculpting on, or for general "hacking" or what have you. You can use this to pattern out a fabric version to make a ham to iron with. You could possibly use these as mastectomy forms (fake breasts) if you'd like too, but unless you print in something flexible they're probably not terribly comfortable.

BASIC HOLLOW: This is the breast but hollowed. If you want to use the form as a buck you will be using heat tools on (like shaping worbla or foam) then I suggest printing this one and filling the back with plaster or concrete or hydrostone (all very cheap options) and leaving the printed shell on. The shell will still be susceptible to heat and denting over time, but because of the stone filling in the back, at least it won't warp or collapse. This is best for disposable bucks you don't want (or need) to last for a long time. If using with vacuforming, you can usually get 2-3 pulls out of these.

BASIC FORM BUCKED: This is just a breast with an added buck, so if you want to sculpt on it but want a flat back/edge give you a clear delineation between breast and chest/rib. You can also pair these as a set by printing a mirrored left side to make a full chest.

BASIC FORM BUCKED HOLLOW: The same as above, but it's hollow so it saves a ton of print time and filament, but you'll have to put something in it to make it more durable.

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Files include:
- Photos
- .STL files

Please do not redistribute or resell. Intended for personal use only. For commercial use such as printing copies to sell or developing products for mass production directly from them (ie moulding and casting silicone versions), you must buy another copy for each sold. If using commercially to develop your own patterns, make costumes, etc, whatever, please consider buying a few copies as thanks for us helping out your business. Basically: please support us so we can continue supporting you with low cost resources!

Feel free to tag us to show us what you print and make! We love to see finished works.

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