Posted on

Teach your students 3D Design for Free

This new program is an excellent way to get primary and secondary schools started in 3D design and 3D printing. You need to have G Suite for education to use SketchUp for Education. You can download G Suite for free here. https://eduproducts.withgoogle.com/

Once you install G Suite, you can get the SketchUp software at this link. https://www.sketchup.com/education/sketchup-for-schools

Some of the benefits of this software are:

›Integrated with Google Drive and Google Classroom

›Works on Chromebooks or any Internet-connected computer. Currently in English-only open beta.

›Available through the G Suite for Education Apps Marketplace or the Chrome Web Store

I expect great curriculum to come as the word gets out but there are many examples of how to get started at the SketchUp website. If you try it, let me know what you think. If you would like to find out more about getting 3D printers for your school, contact me for a free consultation. Every student should be familiar with 3D printing and additive manufacturing today and our goal is to spread knowledge.

Posted on

How to Create 3D Printed PVA Molds Ready for Metal Fluid Casting

How to Create 3D Printed PVA Molds Ready for Metal Fluid Casting

With 3D printed PVA molds you can easily cast highly detailed objects from Metal Fluid.

Not every object can be cast in a traditional two-part folding mold, mostly because some details and more complex shapes couldn’t be retrieved from it. Disposable 3D printed PVA molds are a good alternative in such situations, enabling you to cold-cast highly detailed objects from Metal Fluid.

3D printed PVA molds
Metal figures cold-cast from 3D printed PVA molds
Metal figure cold-cast from a 3D printed PVA mold

Utilizing 3D printed PVA molds

Designer Eliza Wrobel wanted to cast a set of Egyptian-themed figures (originally designed by Zorum). She decided to make disposable 3D printed PVA molds that would enable her to recreate the high level of detail from the original 3D model. First, she took the models and designed simple mold forms with inlets around them.

3D printed PVA molds
PVA mold model in Voxelizer software

In Voxelizer software, Eliza was able to prepare her molds for printing by using a PVA preset and adjusting it for 1.75 mm Plastic Extruder mounted on ZMorph 2.0 SX multitoool 3D printer. It took several hours to 3D print the molds. They were ready to use straight out of the machine – no post-processing was needed at this stage.

3D printed PVA molds
PVA mold printing using ZMorph 2.0 SX multitool 3D printer

3D printed PVA molds are perfect for Metal Fluid casting because they don’t deform once the material starts to give back heat. Metal Fluid is a mix of metal grit in a resin binder that looks, feels, and weighs almost exactly the same as brass, bronze, and other metals. Once the material was poured into the molds, it needed a few hours to stiff.

3D printed PVA molds
Metal Fluid cold-casting using 3D printed PVA molds

After putting them in water for 24 hours, 3D printed PVA molds dissolved completely. Eliza was then able to clean her model from residue material and star post-processing of the metal objects.

3D printed PVA molds
Metal figure after dissolving the PVA mold

Casted figures required sanding to eliminate 3D printing layers and a resin residue that settles over the metal. After that, it’s good to clean the model of any dust and use polishing paste to bring out the patination effect on the metal. This way the figures got a stylish, antique look.

3D printed PVA molds
Sanding and post-production of a metal figure

Many possible applications

3D printed PVA molds can be used to cast highly detailed objects from Metal Fluid that couldn’t be made with any other DIY or low-cost casting method. This way freelance designers, artists, and small companies owning a multitool 3D printer can create their own unique metal figures, statuettes for prizes, paper buttons, bookends, stylish decorations, and even silver jewelry.

3D printed PVA molds
Metal figures cold-cast from 3D printed PVA molds

This method could also be successfully applied to create antique replicas and high-quality movie props at a fraction of previous costs. It’s much easier and less time-consuming than traditional mold making and metal casting too.

Posted on

Painting & Finishing Tips for your 3D prints

7 Useful Advice on How to Paint 3D Printed Objects

As 3D printing has a popular manufacturing method for craftsmen and hobbyist alike, many first prints disappoint enthusiasts as the model does not come out showroom floor ready. Most displays claiming to be 3D printed, have had a lot of post-production polishing. Having a truly finished product is far from professional exclusive, and the work pays off. Your post-production polishing is only as good as the surface you’re working with. In turn, advice on how to paint 3D printed objects must also focus on how a model is printed, and pre-painting steps.

paint 3D printed objects
Source: The Golden Drops / Virtual Magic

1. Know Your Model, Know Your Material

Not only are certain materials better for malleability or sturdiness, various printing plastics are vastly different on how to paint 3D printed objects. ABS can be smoothed by acetone, while PLA works better with ethyl acetate. Different materials can also react to the first polishing in distinct ways as well. For example, metallic filaments are best left in a tumbler for an average of 12-36 hours. Quality wood filaments can usually be sanded like real wood. ABS is more heat resistant and works great for interlocking parts, PLA won’t warp as much during your print and is more rigid than ABS. Exotic filled filaments will mostly depend on the thermoplastic second ingredient.

costs of 3D printing
Various filament samples

2. Avoid edges

By edges, this refers to how much of your model is in contact with the print bed. This is more of a minor detail as most models can lose a few layers from the bottom during post processing and be fine. If your model is not one of these, then try to reposition your model until you find a way for it to sit with a minimal contact to the print bed.

7 useful #3Dprinting advice on how to paint #3Dprinted objects

 

3. Slow and small

Small and slow print settings will be your friend. A smaller extruder nozzle will result in a finer off-the-printer surface, this is best if you plan on using chemical vapors to smooth your print surface or if you want to preserve intricate details. Another element of cleaner prints is using additional fans that are directed at the print itself just beneath the extruder.

paint 3D printed objects
Printing toolhead with additional cooling fan

4. Adjust For Your Equipment

If you’re using the ZMorph multitool 3D printer or another high-grade printer, additional fans and extensive sanding may not be required. A great example of a lower need for post-process pre-sanding can be found in Victor Pons’s dragon door knocker. Right off the print bed, there wasn’t much need for filler as the printer didn’t leave much of any ridges so he could use bonding paint since the surface was already smooth. It allowed the hobbyist to spend more time going above and beyond. Just goes to show that everything effects how to paint 3D printed objects.

3D Printed Door Knockers
Source: Victor Pons

5. Always Optimize Your Surface and Prime

Once you have vapor treated, sanded, and or coated your model with epoxy or resin, you’re ready to paint. Almost any project should include automotive primer, don’t limit yourself to “3D printing” labeled materials. Acrylics, gesso, automotive paints, and even iron powder can breathe life into your project. Avoid epoxy on 90-degree angles, as it will round sharp details.

6. Plan Ahead

If you’re moving the model by hand, pick a spot on the outside to hold it by and apply paint, primer or epoxy to that area last. Nothing can be more frustrating than ruining hours of work with finger marks or moving layers of paint. If your model allows for you to use a stand, this would be best.

paint 3D printed objects
Source: The Golden Drops / Virtual Magic

7. Don’t Let Your Work Go To Waste

Don’t be afraid to experiment in order to find a paint that will bond well with your primer or the plastic surface. If your model will be handled a lot or needs an extra shine, use automotive clearcoat. Another variable includes primer, satin, gloss, and matte paints for different looks. Once you have a little practice, try weathering techniques like scuffing and dabbing on accent colors only to immediately wipe them away. When possible, use what you have to your advantage, like the natural lines in 3D printing to accent faux wood.

Example printing and post-production process

  • Optimize your model digitally.
  • Change your printer settings for quality rather than speed.
  • 3D print your model.
  • Vapor treat if you can.
  • Apply a filler putty where need be.
  • Sand (raise grain count by 100-150 after each sand).
  • Apply filler primer.
  • Sand.
  • Apply a standard primer or first paint coat.
  • Wet sand.
  • Paint (preferably with an airbrush). When painting multiple colors, use sealing painters tape and go light to dark colors if you need to layer colors.
  • Clearcoat, clearcoat, clearcoat.

Check out the video by 3D Printing Nerd in which he guides you through the entire process.

This is what makes the difference

This list has been crafted from our experience, observing professionals, and well-known enthusiasts to really learn how to paint 3D printed objects without any fluff or methods that are only rumored to work. So practice, practice, practice, your project will thank you for it.

Adjust the chemicals, materials, methods, and repetition as need be for the filament and model you’re working on. Always work with personal safety equipment, and in a well-ventilated area. Though this may seem like a lot of work, it is enjoyable to most to extend their projects after the initial print. As you move along the finishing process you’ll find constant reward as your print comes to smooth, shiny surfaces.

paint 3D printed objects
Cleaning ABS print with acetone

Post processing is the difference between design and a product that stays around for years to come. After a few test runs, you’ll have the skills to bring your models to showroom status. Use these pieces of advice as a modular procedure, as it can change to best fit nearly any project your heart desires.

Additional resources on how to paint 3D printed objects

If you want to explore the topic even further, then you should definitely check the following sources:

  • Top 10 3D Printing Tricks by Commando Designs