3mm is more rigid than 1.75mm.
3mm is less expensive than 1.75mm to manufacture.
3mm doesn’t have to be made to as tight of a tolerance as 1.75mm (or is more tolerant–a difference in diameter in 1.75mm is reflected more in the print).
3mm can feed better with a wider variety of extruders.
3mm won’t snap as easily as 1.75mm, which is important for brittle filaments (like Laywood or something).
3mm won’t crush as easily as 1.75mm (for a filament like HIPS).
3mm can feed a greater amount of plastic faster than 1.75mm, if you are printing fast.
1.75mm tangles a lot easier than 3mm.
Make Magazine rated the TAZ and UM2 as top performers, both use 3mm. Just sayin’.
Every Thursday is #3dthursday here at Adafruit! The DIY 3D printing community has passion and dedication for making solid objects from digital models. Recently, we have noticed electronics projects integrated with 3D printed enclosures, brackets, and sculptures, so each Thursday we celebrate and highlight these bold pioneers!
Have you considered building a 3D project around an Arduino or other microcontroller? How about printing a bracket to mount your Raspberry Pi to the back of your HD monitor? And don’t forget the countless LED projects that are possible when you are modeling your projects in 3D!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.