The 20 standard amino acids - redux

thingiverse

I've reworked my previous amino acid kit (https://www.thingiverse.com/thing:2175399) completely. These new models utilize a distinct type of pin allowing them to rotate fully, yet won't fall out after repeated use - although they may loosen up over time. A disulfide model has been added with print-in-place rotatable bonds enabling you to adjust the angle as needed. Note that these models lack hydrogens (which are implicit). Hydrogens can be problematic and significantly complicate printing. At least one more iteration of these models is anticipated, incorporating print-in-place rotatable bonds on side chains. Recommended scaling is 10X (1000%) or higher. EDIT: 10/01/2018 Hydrogen bond clips have been added. These are designed for models printed at 10X and come in three different lengths. They attach to hydrogen bond donor and acceptor pairs, making them useful for demonstrating hydrogen bonding in secondary structures and serving as struts to keep models together when building a full protein from individual amino acids. It's recommended to print these in PETG or a material that's slightly more flexible than PLA.