Bánh răng tương thích Lego Technic - 12 răng

I was really struggling to understand gear, gear-ratios, rotational direction so I decided to start creating some gears to play with. I was initially going for the Lego route but decided it was far more cost efficient to make them myself.

Per Gear ( I will be creating loads more ) I have a few flavours.

A variant - Hole for circular axel with a flat side. This should allow for easily print axels on the flat side without any supports.

B variant - Pressure fit to contain a 693ZZ ball bearing.

X variant - Hoping this will fit a lego X axel. I was unable to test-fit as I don't have any. Kinda hoping the eye ball methods does the trick but will see

S variant - 4mm hole to be able to use 3mm metric screws to attach gear

I also included the gear measuring tool to easily see what the pitch diameter is as well as the number of teeth; simply placing the gear inside to see if it fits. Saves me going nuts in counting the teeth and forgetting on which tooth I started counting. Also quicker to find a gear from a box containing all different types of gears.