# 3D Printed D20 Molds ## Overview https://www.youtube.com/watch?v=6aPvs5oEHF0 ![](https://cdn-learn.adafruit.com/assets/assets/000/030/470/medium800/3d_printing_hero_parts.jpg?1455060294) This year’s Valentine's day, we’re 3D printing molds to make DIY bath bombs. This is a fun way to make custom bath bombs, soap or even chocolates just in time for that special Hallmark holiday. We’ve remixed the design from our previous[talking D20 project](../../../../talking-d20-20-sided-gaming-die) and simplified it a bit so it’s easy to mold parts. You can also modify the design if you’d like! ![](https://cdn-learn.adafruit.com/assets/assets/000/030/480/medium800/3d_printing_heart-mold_03.jpg?1455062557) ## Experiment Try experimenting with different scents, colors and shapes to use as molds. You can even use these [8 bit hearts from our choclate mold project!](../../../3d-printed-chocolate-castings) ![](https://cdn-learn.adafruit.com/assets/assets/000/030/486/medium800thumb/3d_printing_hero-toss.jpg?1455063556) ## Tools and Supplies - [3D Printer](https://www.adafruit.com/category/128) + [Filament](https://www.adafruit.com/products/2080) - 1/2 cup Baking Soda - 1/4 cup [Citric Acid](https://www.amazon.com/gp/product/B000OZFECU/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1) - 1/4 cup Cornstarch - 1/4 cup Epsom Salt (or sea salt) - 3 tsp Castor Oil (or any vegetable oil) - 1 tsp Essential Oil - Soap or Food Coloring  - 1tbs Water ![](https://cdn-learn.adafruit.com/assets/assets/000/030/476/medium800/3d_printing_ingredients_03.jpg?1455062012) # 3D Printed D20 Molds ## 3D Printing ![](https://cdn-learn.adafruit.com/assets/assets/000/030/473/medium800/3d_printing_two-parts_03.jpg?1455061167) ## Customize The Design The parts where designed in Autodesk Fusion 360. The design has been made public, and available to download in different formats. If you'd like to use a different CAD software package, you are free to import the files and remix them. [Download STLs](http://www.thingiverse.com/thing:955433) [Download Source](http://a360.co/1SIYCzo) ## Filament Materials We recommend using PLA material to reduce wraping while 3D printing. The parts can be printed in different types of filament, such as ABS, PET or Nylon.  ## PVA You could also try using water soluble filament, which will let you print more details and you won’t have to demold because the shell will dissolve in water. You'll want to modifiy the shell thickness to 1 shell to insure the mold will dissolve faster. ![](https://cdn-learn.adafruit.com/assets/assets/000/030/487/medium800thumb/3d_printing_pva-dissovle.jpg?1455063762) ## Slicer Settings To slice the parts, we used Simplify3D. We recommend using the settings listed above or use them as reference. We 3D printed these parts on a Ultimaker 2+ ** ** 3D printer. If you have Simplify3D, you can download our profiles below. [Download Printer Profiles](https://github.com/adafruit/printer-profiles) # 3D Printed D20 Molds ## Assembly ![](https://cdn-learn.adafruit.com/assets/assets/000/030/474/medium800/3d_printing_ingredients_03.jpg?1455061558) ## Ingredients The main ingredients are baking soda, citric acid and corn starch, which also holds everything together. Try experimenting with different scents and colors. Danger: ![](https://cdn-learn.adafruit.com/assets/assets/000/030/477/medium800/3d_printing_mix-ingredients_03.jpg?1455062188) ## Mixing Make sure to use two different bowls for mixing the ingredients, one for the powders and one for the liquids. Mixing the liquids at the sametime will activated the mixture. - 1/2 cup Baking Soda - [1/4 cup Citric Acid ](https://www.amazon.com/gp/product/B000OZFECU/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1) - 1/4 cup Cornstarch  - 1/4 cup Epsom Salt (or sea salt) - 3 tsp Castor Oil (or any vegetable oil) - 1 tsp Essential Oil  - Soap or Food Coloring - 1 tbs Water ![](https://cdn-learn.adafruit.com/assets/assets/000/030/478/medium800/3d_printing_mix-liquids_03.jpg?1455062463) ## Mixing the liquids To keep the ingredients from activating while mixing, you’ll want to add oils, scents and dyes in small amounts at a time. ![](https://cdn-learn.adafruit.com/assets/assets/000/030/479/medium800/3d_printing_mix-liquids-mixed_03.jpg?1455062472) Once it’s all nicely blended, we’ll need to pack the mix into the molds as tightly as possible. ![](https://cdn-learn.adafruit.com/assets/assets/000/030/481/medium800/3d_printing_pack-mold_03.jpg?1455062667) ## Packing molds Pack the mold by layers, making sure to pack each layer down as tight as you can. It’s a good idea to pack more than necessary so the two halves fuse together. ![](https://cdn-learn.adafruit.com/assets/assets/000/030/482/medium800/3d_printing_combine-halfs_03.jpg?1455062756) ## Join molds Join the two halves together by pressing them tightly and remove the excess from the sides. Try to smooth out those edges so there’s less of a seam. ![](https://cdn-learn.adafruit.com/assets/assets/000/030/483/medium800/3d_printing_rubberbands_03.jpg?1455062837) ## Drying To hold the two parts together, we can use a few rubber bands while the mold dries. We can let the bath bombs dry overnight. For faster drying, you could pop them in the freezer for about 15 minutes. ![](https://cdn-learn.adafruit.com/assets/assets/000/030/484/medium800/3d_printing_mold-complete_03.jpg?1455062929) ## Demolding With our mix fully dry, we can demold by tapping and squeezing on the sides until they come loose. Now there we have it! An icosahedron bath bomb - super cool! ![](https://cdn-learn.adafruit.com/assets/assets/000/030/485/medium800thumb/3d_printing_hero-toss.jpg?1455063535) ## Toss in the tub and enjoy! These are great to customize with different colors and scents and it’s  a lot fun for kids! ## Related Guides - [Bluetooth Controlled NeoPixel Lightbox](https://learn.adafruit.com/bluetooth-neopixel-lightbox.md) - [Epoxy Resin Torch Lamp with Touch Control & 3D Printed Base](https://learn.adafruit.com/epoxy-resin-torch-lamp-with-touch-control-3d-printed-base.md) - [Automatic Dice Roller](https://learn.adafruit.com/automatic-dice-roller.md) - [Wooden NeoPixel Xmas Tree](https://learn.adafruit.com/wooden-neopixel-xmas-tree.md) - [PyPortal Weather Station](https://learn.adafruit.com/pyportal-weather-station.md) - [How to 3D Print molds for custom Stamps @ustreasury](https://learn.adafruit.com/how-to-3d-print-molds-for-custom-stamps.md) - [3D Printed Tesla Cable Holder](https://learn.adafruit.com/3d-printed-tesla-cable-mount.md) - [3D Printed Dragon Lamp](https://learn.adafruit.com/dragon-lamp.md) - [Motorized Marble Machine](https://learn.adafruit.com/marble-run.md) - [USB Foot Switch Controller in CircuitPython](https://learn.adafruit.com/usb-foot-switch-circuit-python.md) - [LEGO® compatible Battery Case](https://learn.adafruit.com/brick-compatible-battery-case.md) - [Cranky Adabot Solder Dispenser](https://learn.adafruit.com/cranky-adabot-solder-dispenser.md) - [LEGO Compatible Crickit Rover](https://learn.adafruit.com/lego-compatible-crickit-rover.md) - [Heat Set Insert Rig](https://learn.adafruit.com/heat-set-rig.md) - [Gmailbox](https://learn.adafruit.com/gmailbox.md)