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Rotational molding can create both small, intricate designs and large, complex parts and assemblies.

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Just a short little demolding video! These are my original hand sculpted clay pieces I sculpted for my Fairy Fluff Art Dolls. I accidentally destroyed some of my old molds by curing the resin in too cold of a place. When I removed the pieces they stuck to the mold and destroyed it. Lesson learned, always cure your resin at the correct temperatures listed in the directions or risk destroying your molds. Resin casting can be so tricky but when you get it right it’s also so satisfying! I’m very happy with these molds, they look flawless! I’ll never get sick of pulling these adorable faces out of the molds. I’m using @smoothon Mold Max 12NV, I tried it after seeing @kibyukstudio use it with such great results! Everyone go follow @kibyukstudio if you’re not already, his work is amazing. Don’t mind my finger, I bashed it with a hammer while working on the garden bed. 😂🤷🏻‍♀️

Learn more about the Rotomoulding Process.

Rotational Molding and Its Advantages 

Rotomolding is a technique used in the manufacturing industry to create highly durable and customizable hollow plastic products. The process allows for double wall construction. It ensures uniform wall fitness throughout the construction. 

Rotomolding process is ideal for making large products such as tanks and bins that have to be hollow, and can be made in one piece. It is also utilized to make complex medical products, toys, recreational craft, and extremely artistic point-of-sale products. 

In comparison with other methods of plastic molding, rotomolding has many advantages in terms of relatively low levels of residual stresses in the process and relatively inexpensive molds. 

Rotational molding is also called roto-molding or roto-casting. Many manufacturers of hollow-type plastics usually prefer this method in making their products. Another process used in liquid-vinyl is slush molding, which is also a similar process. 

Rotational Moulding process offers many advantages as compared to other methods of plastic molding such as injection molding, blow molding, and thermo-forming. 

Benefits of Using Plastic

ü  Plastic is corrosion resistant, it cannot rust. Stainless steel products are subject to rust in welded parts.

     ü  Plastic is chemical resistant. It’s a material that can withstand various chemical components, which makes it perfect for tanks, intermediate bulk containers, and other containers.

     ü  Plastic is a durable material. It is extremely impact resistant and it does not dent. Plastic parts can incorporate metal inserts in high-stress areas as well.

    ü  It is economical. Plastic is lighter weight than metal, therefore it takes less fuel to operate equipment with plastic parts. The material is less expensive than metal. Because rotomolding allows for one-piece construction, this reduces assembly costs. 

ü  Plastic is a safe material to use. It eliminates sharp corners and burrs, resulting in a smooth, seamless product. This reduces the risk for injuries for operators.

Advantages of Rotational Molding Process

 Size Options

 Rotational Moulding can produce any size from the smallest part to larger sizes, which means the process is flexible compared to other systems. The process can be used on a small ping-pong ball sized plastic part to 21,000-gallon tanks. Many manufacturers are able to produce a large capacity tank between 0 to 1000 pounds, and as tall as 17 feet.

 Different Designs

 With rotational molding, it is very easy to design different shapes. This is because when the hot plastic compounds are placed into a mold, they take the shape of the mold as they melt and then harden. The process makes it ideal for creativity since manufacturers can make any shape using the process. While other types of molding processes are inelastic in nature with few options, rotational moulding can provide different varieties of design in the manufacturing phase.


Rotomoulding can easily accept metal inserts while producing the part. It also allows the possibility for additional threading inserts. Other methods are cumbersome, while with rotational molding can be processed at very low costs. Assembly techniques can be changed in the rotomoulding process easily. Other manufacturing methods do not readily take inserts and this can make it more costly than rotational molding. 

Color Sectioning 

Color sectioning is much easier with the rotomoulding process. Color blending can be done in-house to a variety of shades. Color matching is done easily on the process without extreme volumes.  A number of colors can be achieved at a lower cost. 

Quality Surface Finishing 

Rotational Moulding process offers high quality surface finishing capabilities by taking the exact shape of the particular mold as well as the texture. This allows very high gloss quality finishes on the product surface. It can also produce smoothness and quality artistic design, and can take on a high oriental texture finish on its surface. 

Decorations in Mold 

The process takes any originally designed decorations made in the mold and will feature it on the plastic in a vibrant way. This amazing technique of in-mold graphics is used to decorate and design graphics are a by-product of rotational molding. The unique designs will stick permanently in the final plastic product. This method allows easy molding for items such as serial numbers, bar codes, and colorful logos. The designs often appear in better quality compared to the traditional ones. 

Quick Tooling 

The molding process uses low-pressure without any need of ejection or in-mold cooling, thus reducing the costs of a mold for rotomolding. Especially given the extreme heating and cooling cycles, aluminum manufactured molds tend to perform better. The process is cheaper when aluminum is involved. Depending on the design and complexity involved, a new tooling process can only take about four to twelve weeks. 

Top Quality Durability

 Parts and cases that are roto-molded are stress-free and can withstand impact force, chemicals, and environmental factors. This is the reason why the process is ideal for making cases designed for both military and commercial use.

 Quick and Easy to Make and Customize

 Rotomoulding can significantly reduce lead times. Molds can be made in a matter of weeks when possible.  The process allows for tooling to be produced which would mold multiple cavities of a product to be integrated into one mold, thus reducing the part price. Rotational molding also allows further customization since the molding process is capable of using a wide range of materials. 


 Rotational Moulding is a very inexpensive method to produce high quality products because of its speed and unique integration process. Larger products are to be molded at a lower cost than products made with other molding plastics processes. The cost of the equipment needed for rotational molding is also less expensive compared to other processes. With rotational molding, you get high quality products with superior durability at lower prices than plastics fabrication or even metal fabrications. 

Consistent Wall Thickness

 Usually, metal components are weakest at the corners. These are the exact areas where the parts endure the most stress. With other processes of molding, it is difficult to achieve total consistency in wall thickness. With rotomolding of plastics on the other hand, the constant rotation allows the polyethylene to coat every surface evenly.

 Rotomolding Summary  

 While not as widely utilized as injection molding or blow molding, the rotational moulding process has its place in each of our daily lives.  The durability of a rotationally molded product in comparison to an injection molded or blow molded product is second to none.  The low production requirements, inexpensive tooling costs and durability of the products help ensure that rotational molding is a polymer based manufacturing process that will be around for generations to come.  


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                      Final Bioplastic with CNC Mold

The plastic mold recipe:

Recipe ratio (from @nikhileshmohan) :

  • 6ml water
  • 1.5ml glycerol
  • 2ml vinegar
  • 20g gelatin
  • 5g starch
  • and a whole lot of beads and sequins (note: not in the original recipe)

All heated and mixed together, poured onto our CNC mold, cooled for about a week for this cool result!

Week 5 Bioplastics with my team  @sanoyadidi @aditimonga  


Ningbo Leadway Machinery Technology Co.,Ltd is a professional manufacturer of plastic injection molding machines ranging from 60ton to 1300ton all equipped with servo drive and servo pump.This video is showing you our current plastic exhibition in Isfahan Iran . Our brand name is Fuhrung which is Germany 🇩🇪 language. We make European style injection molding machines. Our quality is one of the best in China 🇨🇳. Our target customers are those who want higher quality and hate low quality and prefer to pay more for good quality machines. #injection
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#maquinassopladoras #envasesplásticos #compressionmachine #plasticcap #plasticclosure
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#injecaodeplasticos (at Ningbo)

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I swear to god, Tumblr was giving me errors for uploading, but I guess it uploaded anyway? I’m confused. Hopefully they got their game “together”

The little Goat thing was my guinea pig for molding and casting, and while it’s far from perfect, it’s a start. Resin cures WAY faster than I’d ever imagine. Any protips for casting by hand would be greatly appreciated

Plaster & Molding - Exploring possibilities

I was in a workshop today exploring new ways of looking at using plaster which was thought provoking. There are more possibilities than what I had mapped out in my mind.

The two explorations that impressed the most today were the perspex sheets folded into geometric forms with plaster applied to them and the pillow case filled with plaster. The plaster work from these two items was pretty impressive.