Here’s my second attempt at really really small.
This was printed in ABS with a 0.15mm nozzle and a 0.04mm layer height. I printed two at once to help with cooling. The first attempt I made failed due to not enough cooling between layers. The total height of the rook is 1/2", or 12.7mm (197 layers). The two are sitting on top of a dime. I think with a little work, I could get a better result. Note, you can see the double helix through the door of the rook on the left. I don’t think the double helix was successful all the way up, and it’s so small, I can’t tell how well the spiral staircase came out. Still, it’s a small step in the right direction.
The machine is a kittaz upgraded to a Taz 5 and then with two other mods. I added a micrometer stop for adjusting z height, and I converted to a 1.75mm Hexagon hotend.
If I can get the quality improved at this size, I’ll have to start playing around with my 0.10mm nozzle!