HPLC and snap-lid vial holders

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.