Nhẫn fidget bánh răng kép cỡ lớn

I was asked to combine the idea of double gear rings and gear bracelets (see here) into big double gear rings. I made them a bit wider for stability - and here they are. Because of the longer and slightly bigger planet gears it also turns out turning quite smoothly! While clearly on the bigger side, I find this to be a quite enjoyable fidget toy keeping your hands occupied, (not just your fingers :)

I do not suggest putting your hole hands through; getting in is easier than getting out (depending on the size), and you might end up handcuffing yourself. Forcing your hands out may break it, leaving sharp edges and dozens of small parts. 

Other fidget gear rings are available here.

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Printing: 

The 3mf files are split into 5 parts for multi-color printing. 

1. the sun gears (inner rings)

2. the main parts of the planet gears

3. the upper 0.38mm (two layers) of the planet gears

4. the lower 0.38mm (two layers) of the planet gears

5. the double outer ring gear

If you choose a different color for only parts 3 and 4, only 4 color changes are required, resulting in low filament waste with single-nozzle multi-color printers. Color changes can also be done manually (see here).

General settings:

• I use 0.4mm nozzle and 0.17mm layer height

• random seam placement

• a bit of elephant foot compensation (say 0.2mm)

• I prefer NOT only one perimeter/wall on top layer

• 3 walls

• I also usually paint seams on the inside into one of the turn tool slots.

• Good bed adhesion is essential due to the small footprint.

This model requires a well dialed-in printer and filament combination; depending on these and the settings, the gears may

• rotate freely and quite smoothly right from the plate,

• need some force to break free,

• need some minutes of breaking in to run smoothly,

• be totally fused together.

If you have problems with fused gears, you can try:

• using force; if it breaks it wasn't usable anyway.

• a different filament; some (like silk) are more prone to ooze and fuse than others.

• reducing the extrusion multiplier/flow ratio a bit

• a slightly negative XY size compensation (e.g. -0.02)
  (OrcaSlicer: negative for contour, positive for holes)

• printing outer walls first

• reducing acceleration and speed

• reducing the temperature

You can support me on ko-fi.

Have fun!