Because of my difficulties with the first parts of the BOM. I exported all 3D Models from the CAD Model myself. So, I could validate self if the parts is matching and needed in the given quantity. From this point on, I have forked the GitHub repository, and I’ll change the files to match my needs.

Changes

Changes are applied to the third articulation and the sleeves are added as STL / 3MF Files. As far I can tell these changes are the only ones we have to make.

3M2C / 3M2CC

I changed the motor from a SM42HT33-1334 to a 42BYGHW609. This change has consequences for our 3d-printed parts.

You can see the Motor with the length of 34 mm barely fits inside the chamber. Our new motor has a length of 40 mm. We have to change the length of the chamber to create enough space for the bigger engine.

For more details, visit this post: DIY Moveo Part 5.1: Changes 3M2

Sleeves

The sleeves listed in the BOM (ID 30 and 31) see part three from this series will be printed, too. So, we have to design and print them. The results are

BOM ID 30 is: M5 Sleeve Ø 8 mm and length 10 mm
BOM ID 31 is: M8 Sleeve Ø 12 mm and length 20 mm

The files can be found here

Price Point: printed Parts

Regarding resources, there are two needed to print out the parts. The first is the material and the second is the print time. For a hobbyist, the print time should not be an issue, but for somebody who needs the printer for commercial applications and for this project, the print time will be matter. This is why I added the print time as a parameter for the price point.

I’m using PLA with a layer height of 0.2 mm and an 15% infill. If you change some of these values, the print time and the weight will change.

Total* weight: 2.31 kg
Total* print time: 8 days 12 hours 9 minutes (204.15 hours)
_{*precalculated values they aren’t measured, only the predictions from the slicer}

If I assume that the print time has no cost and the kilogram of PLA cost €30, then the money side price point is: €69.3

Structure

The first (and biggest) parts are printed with the Gyroid infill. This is the default Infill from the Prusa Slicer. After I read the blog post “Infill patterns” from the prusa help page, I changed my mind.

Infill patterns

All information you need to know about Original Prusa 3D printers. Assembly manuals, print quality troubleshooting, calibration, PrusaSlicer and much more.

In my opinion, the infill pattern “Adaptive cubic infill” is better for this purpose. Not only is the print time reduced, it also consumes a lot less material. The 3M1 needs with the Gyroid infill 254g and with the adaptive cubic infill, only 224g material. This means that our robot can lift 30g more than before ant this only by changing the infill pattern and by changing only one part. The strength from the 3d-printed part for our purposes should be quite similar, so there is no real reason to use the Gyroid infill anymore. I’ll use the already printed parts with the Gyroid, though.

3D-printed Parts

I added BOM ID’s 233, 234, 235 and 236 to the list. Please note, that I’m not printing the components for the “Box electronics”, this is because my hardware doesn’t match the original and has a different size. We need to design our own at some point.

Please have a look at my release candidate on GitHub. It contains all files in the 3mf format and STL. If you have a prusa i3 mk3, you can go ahead and print the files direct.