You will adopt 4 tiny creatures with wings to add to your pencils! Print in place: you won't need to assemble it, it will print fully assembled and ready to use! ^.^ No supports needed! Let's avoid waste :D
MY PARAMETERS:
Download the Gcode file to see how I print it with tricolor silk PLA filament! (Spoiler: layer height 0.01mm, infill density 9%, temperature 220°C, build plate temperature 45°C, printing speed 84mm/s). They fit regular pencils easily (without glue). But, if you want to be a pro: If you have difficulty fitting the pencil, simply remove a bit of material with a deburring tool. Want to make sure beforehand that the hole is perfect for your pencil or pen? Ok! Create a cylinder of the size you need, place it over the hole, and scale the model based on how much it needs to fit your reference cylinder! It can also be easily done in Creality Print software using the 'Drill' tool.
Commercial license: Yes, print & sell! Want to sell what you print? You can do it without asking anything to the author! The only thing this license doesn't allow you to do is to allow others to mass-produce this model without tipping me first! This way, I can continue to create new things and improve existing ones, based on your interests. Stay inspired :) Have fun!!! :D