Protein and DNA models from the Protein Data Bank (pdb2print)
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Real molecular structures, one object per chain for multicolour printing, with press-fit magnet pockets so two-part mode
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- Printables
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- Chemistry & Biology
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- Creative Commons — Attribution
Real structures from the Protein Data Bank, printed at 1.5 mm per ångström. Each chain is a separate object in the 3MF, so you assign a filament per chain in the slicer.
The multi-part models split at the actual interface between the chains, with press-fit magnet pockets cut into both sides. 0.2 mm clearance. There's a set of files for each magnet size, so check which magnets you have before you slice.
To generate any structure exactly the way you want, including more control over the magnets and an optional display stand, visit pdb2print.org
Printing
A few things that made the difference:
Supports on, for essentially everything. Very little of this geometry is self-supporting.
Organic (tree) supports, set to build plate only. They reach into the gaps without covering the whole surface. Build plate only matters: left unrestricted they grow up into pockets and channels in the structure, and you will not get them out again without damaging the model. Check the preview for anything growing into an enclosed space before you print.
Raft, 5 layers. The contact patches are small and awkward and a brim is not enough.
Cartoon style is hard. The ribbon is thin and unsupported over most of its run. Use 100% infill if you print it at all. It suits resin better than FDM.
Surface style is the most forgiving and the best one to start with.
Generating your own
These files came out of pdb2print.org, which I wrote. Type a four character PDB ID, pick a style and a magnet size, download the 3MF. Any entry in the PDB, not just the ones here, so if you want a different structure, scale or magnet size it is quicker to generate it than to ask me. Free, no account, source on GitHub under MIT.
Post a make if you print one. If something fails to slice or comes out wrong, send me the PDB ID and the settings and I will look at it.