Two general-purpose vial holders, originally designed to fit into a custom heating chamber:
https://www.thingiverse.com/thing:2891015
For higher temperatures I have milled aluminum variants of these. The 3-slot variant fits various sizes of standard issue vials, the 20-slot variant is designed specifically for 1.1 (tapered) and 2 ml HPLC vials.
hplc_vial_holder.stl | 732.3KB | |
vialholder.stl | 99.7KB |