3D Scanning and Printing

This week, we worked with the 3D printer. In additive manufacturing, there are three common printing processes: FDM, SLA, and SLS.

I prefer the FDM printing process because it is easy to use. The material costs are relatively low, and the open design of the machine allows for better observation of the printing process. Additionally, this method is more sustainable since there are recyclable or biodegradable materials like PLA.

My preferred 3D printer, which I also use at home, is the Bambu Lab A1 Mini.

Information about the Bambu Lab A1 Mini

• Printing Technology: FDM
• Build Volume: 180 x 180 x 180 mm
• Material Compatibility: PLA, PETG, TPU, ABS
• Features: Auto-calibration, high printing speed, easy operation

For more information, visit the official website.

Scanning and Printing

In our lab, we have the SHINING 3D, 3D EinScan Pro 2X Scanner. Click here for the Website of the company

So, I found a good step-by-step approach to learning how to use the scanner. By the way, sorry that most of it is in German. I can’t change that because we are using it with children in a workshop.

Click here for the step-by-step Guide

1. To repair them sustainably and improve ergonomics, I coated one of the supports with scanning spray. This created a white layer on the object, making the scanning process easier.

1. The scanner was mounted on a tripod, while the object was placed on a turntable.
2. The exposure settings were adjusted to minimize unwanted points being scanned, such as cables.

1. The first scan was conducted from 10 different angles. Initially, the turntable markers were used for orientation. Afterward, unnecessary points were removed from the file.

1. The second and third scan rounds used the already scanned geometry as a reference.
2. In the final scan round, I tilted the object slightly using modeling clay to capture more details underneath. Important: After each scan, unwanted objects must be removed.
3. Once a complete point cloud was obtained, the scan was optimized. The object was then processed into a mesh and saved as an STL file.

1. The file was imported into the Bambu Slicer. Minor irregularities on the bottom surface were trimmed using the cutting tool—only slightly.

1. The object was then automatically aligned on the print bed. A flat surface is ideal to prevent overhangs and avoid the need for support structures.
2. The printing process began. After a successful print, the support fit perfectly, and the keyboard was fully functional again.

Here you can find the stl-file:

Click here for the stl-clip

Additive Production

1. I had several attempts before success. Initially, I tried printing a ring with a movable ball, but it did not work—at least not without support.
2. Then, I designed a chain with three links. The links were shaped like ellipses.

3. However, I made a mistake while designing in Fusion 360. I had to realign the links to ensure the ellipses were all on the same plane for printing.
4. In Bambu Slicer, I added a small, hand-drawn support to prevent floating elements.

5. Despite this, there was still an 8-second overhang to deal with during printing. However, I decided to give it a try.

6. If you want to test this print, make sure to use a brim and light support.
7. Depending on the printer, this may cause issues, so the print settings should be adjusted accordingly.

For my next chain print, I’ve learned that I will make the rings larger and first create a plate for the ring to improve the process. So I changed my project idea and create a Chain for a watch. This is better for a additv process.

Here you can find the stl-file:

Click here for the stl-chain

I found a good video with print in place production of a watch band. Click here for the Video Tutorial

In the sketch I changed the grid size of 5mm. That was so new for me to change the grid and work with this.

Also, I brought the joints into different positions and worked with the horizontal/vertical tool.

Here I looked for the distance i need for a perfect fit.

For the perfect fit I controlled it with the section analysis.

At the end, I used the pattern tool with a distance of 10.50 mm.

So, if you want to learn this, check out the YouTube video.

Click here for the stl- Watch band

Click here for the Fusion-file Watch Band

Group Assignment

For the settings of my Bambu A1 mini you can find some information and testing at our Group assignment: Click here for our group assignment

For me, as a learner, it was surprising to see how close the printers are in terms of stress test results and tolerance. I remember a time when different printers were always slow, calibrating the Z-axis took so much effort, and even the room temperature could affect the entire print. I think in the past four years, there has been a significant advancement in 3D printing technology, especially in FDM printing.