For my 3D print, I chose Morton’s Rolling Knot found on Thingiverse. At first glance, I thought it was two interlocking loops, but it’s actually one interlocking with itself! Super cool, and it’s made to roll due to its geometry.

First, I used the FDM printers to make four copies of the knot. I started with just one, to test the dimensions and the print quality. It came out well, but I accidentally snapped it while removing the supports:

I printed six copies overnight for the next batch, in case I broke them again while removing the supports. However, something went wrong and the prints ended up not so great:

For my final batch, I printed five and they turned out great!

I successfully removed the supports, and here is the final product:

For the SLA version, I was slightly dissatisfied with how scuffed it became while I removed the supports. Here’s how it looked overall:

It was also slightly larger than the FDM prints, so I probably didn’t get the same scaling while preparing the SLA print:

Price Estimate:

PLA print material: ~$2

Resin print material: Unknown, but ~$50/L

FDM machine runtime: 50 hr

SLA machine runtime: 6 hr

Labor cost ($10/hr for 2 hr): $20