NMR tube holder (20 tubes)

This is a simple holder for NMR tubes. It can hold up to 20 standard NMR tubes with 5 mm diameter.

I recommend printing it with a wide nozzle (0.8 mm) for faster print time. No support is necessary!

You can print in PLA, which has a decent resistance against most solvents, but it is extremely soluble in chlorinated solvents, especially CDCl3.

For this reason, the recommended material is polypropylene (PP) which is resistant to pretty much every solvent you can throw at it. However, since PP has a strong tendency to warp and doesn’t stick to most other buildplate materials, it is quite annoying to print. Here are some tips:

• Put PP tape on your buildplate for adhesion (standard “Tesa” packing tape is usually made from PP).
• Use a brim as large as possible.
• Try to enclose your 3D printer with some material to create an enclosed build space. For Ultimaker 2+, you can close the front with aluminium foil, or buy a front door.

https://ultimaker.com/de/learn/beginners-guide-to-3d-printing-with-pp