You need a Slicer program, there are many available and most of them free. Better to ask the library what they would recommend or look up how their printer is called and search what's best for that.
The Slicer is to resize the model (so you need to calculate what you need yourself for it to fit) and choose the filling. You could print the model solid but that would take more time to print and cost more money in form of filament or you choose one of a myriad of possible fill patterns that ensure more stability than having the print completely hollow.
Other things for your concern might be:> The type of filament they have and its stability> Fine Tuning the slicer settings for detail, depending on how common the printer is there should be recommended setting on the internet, I wonder if the library doesn't have recommendations itself though.> learning the difference between FTL and SLA 3D printing. FTL is what most people know with the filament on a spool, that type of printer is good for big items but at the expense of finer details and with the need of sanding to have smooth surfaces. SLA is a laser based printer and great in fine details for small objects with no need for sanding but the print needs to be cured with alcohol and UV light and the material is more expensive as well as not as stable as what you can use for FTLs.
And as a disclaimer: I am a novice with no actual 3D printer, having done no printing yet only my own research based on Youtube tutorials, so don't trust my words too much, I guess.>>7919012>>7943046
Only 4 or 5 of these parts are direct copies of Lego elements. But yeah, that was a dumb move.