Evaluation of the project

From the beginning of the project, we had a very clear goal compared to other projects. Creating eight crowns for a monument sounded straighforward. Due to this clarity, we could start right away and this helped us a lot in the time planning.

After coming up with a plan, were able to start scanning in the first week and throughout the rest of the project, we spent most of the days really working rather than thinking or waiting. Even though the crowns are not done yet, we have not been wasting time and worked on the project as well as we could.

The three of us worked quite well together as a team. While Rohan is clearly the person with the most knowledge of moulds and 3d models, Vivian and Tom were able to learn a lot and contribute with new ideas or perspectives. Because we did almost everything with the three of us, from scanning to pouring the wax, we all thoroughly understand the process and agree on what is the best method to recreate the crowns.

There was a big difference in experience, Rohan and Vivian having studied design while Tom studied Electrical Engineering. On top of that, Rohan has a lot of hands-on experience due to his work. Even though the differences, we understood each other very quickly and were able to efficiently work together without arguments or a lot of misinterpretations.

During the project we had at least weekly contact with our coach Maaike. This varied from meetings in which we could show our progress to mailing her about what we were planning to do. Maaike really let us decide on what would be the best for the project and with good feedback every time, we could progress really quickly. She was very involved so it felt like we did it together.

Unfortunately, we were not able to work out all ideas equally well. The digital model of the crown, created from scratch was finished too late to be sent to Groningen. Even though we agreed on that it would look too smooth and that the newly cast crowns would lose the historical touch, it would make a good comparison. On top of that, maybe it would regain the historical touch because of the loss of detail due to casting the wax. Looking back, we could have planned it better so we would have it in time.

Personally, I think that the project went really well. The atmosphere in the group has always been really nice and being able to make something quite important with two just as enthusiastic teammates is really satisfying. Where Rohan always was full of ideas and Vivian never afraid to try out new solutions. Even though we still have a way to go to finish the crowns, I am really glad with the results so far.

We are looking forward to finishing the crowns and seeing them on the royal monument.

-The End-


The science fair was an opportunity for all of the groups from the Advanced Prototyping minor to present their projects to each other and some invited guests.

We all set up our stalls in the IO building with Robotics on one side and Advanced Prototyping on the other so that people could wander through looking at two different styles of projects.

All of the projects were well represented and generated a lot of interest from everyone walking by.

We had the opportunity to explain the project to many groups of people who all seemed excited to see what we had been doing and what we planned to do in the future.

On the left side of our table we showed the different methods we used for restoration of the model. On the screen we showed two rotating models which showed the difference between digital restoration and the unrestored scan. On the right side we showed our cast pieces and various prints.

On the poster we explained our goal, method, and our plan for testing the different materials and restoration techniques. Next to the poster we also showed some pictures of our process in a small timeline.

In this table we present our conclusion by comparing all the requirements stated in our Method. As can be seen in the table we thought that the best method for reproducing all eight crowns would be to create a silicon mold from the castable resin print and then make eight wax crowns from that to be sent off for casting in iron.

We will meet again with our coach Maaike in the coming weeks to discuss if the client is happy to proceed with this and then we will try to get the crowns prepared and sent off before Christmas.

We think that the Syrian Tablets were the people’s choice winners with their interactive “make your own tablet” exhibition. Ultimaker XXL were the MVP with their display being the first thing most people saw when walking in to IO and enticing them to come and see what we were up to. Honourable mentions go to the soft robotics team for having a robot that was a bit too soft to support itself but still moved anyway and the MX3D mobile printing who couldn’t show much due to confidentiality.

Retouching the print and receiving the metal samples

Currently we are in the final few days before the Science Fair which will be held this Tuesday. On this day all the groups from the Advanced Prototyping minor will present their work. Even though we got a fair amount of prints and models to show at the fair, we are not quite finished yet.

This morning (Monday) we took out the cast-able resin print we started Friday. We were very happy with the quality of the print, but there is still some room for improvement. That is why we will edit it manually.

A full-size cast-able resin print

After cleaning and taking off the support, we used a dremel tool to start cleaning up the edges. Even though we still have a long way to go, the difference is clearly visible and the lines are getting sharper and more detailed.

Using a Dremel tool on the cast-able resin crown

During the cleaning, we noticed an email from Maaike that she received the casts of the samples we sent to the casters in Groningen. We decided to get them as soon as possible, so we took the first train to The Hague.

The metal samples from Groningen

After receiving the metal pieces we noticed straight away that the marks on the back were not visible anymore! Luckily we cut the pieces a little bit different so with some puzzling we could to figure out which one was which. We also saw that all the pieces are very similar to each other. The digital and manual restoring is visible, but the usage of different materials (cast-able resin or wax from the silicon mould) has little to no influence on the result.

This lack of difference tells us that we can use both methods to restore the crowns, and since both methods differ a lot in time and money, we can choose the most suitable one. This means that we will chose wax instead of cast-able resin, because this is much cheaper.

One other observation we can make is that we still have to work on the details. Due to the casting, the crown will lose a little detail. We therefore have to overcompensate for it, which can be done by continue using the Dremel tool on the cast-able resin print.

For now we will continue to prepare for the Science Fair by making posters and other materials to explain our process as clear as possible to the visitors.

Rebuilt from the ground up

One of the methods for restoration that we wanted to explore was completely rebuilding the crown digitally. We did this in Solidworks by reverse engineering what we could from the existing crown. With this method the details will be much clearer than with digital retouching. However, the historical charm could be lost with a digital made model. That is why we will make a model to see how accurate we can get.

We knew the overall dimensions and could work out many of the angles and curves by taking multiple measurements from a datum point (ie the height and distance to centre).

Unfortunately due to the degradation of the existing crown there were a number of elements that we had no reference point for, such as the flower details that are repeated above the collar of the crown. For this we tried to find examples of similar details in other royal crowns but ultimately had to create our own interpretation of the details and so are not sure if it is accurate compared to the original.

This seemed to be the most challenging part of rebuilding the crown digitally so we started with it and once we had the flower details figured out we moved on to bulking out the rest of the crown. Screenshots of the process can be seen below followed by a digital render of the finished crown.

Although the model is very accurate it still looks very clean and modern. That is why we decided not to use this digital model, but continue with the digitally retouched model from before.