====== Lab Notes for the DIY Spin Coater Build ======

==== Day 2026-01-18 (q3k, rob, hugo, rahix) ====
first prototype of spincoater hardware:

{{:projects:spincoater:pxl_20260118_200953672.jpg?400|}}

An unknown quantity of PMMA was added to an unknown quantity of acetone. Solution was refluxed at 50 degrees on a hot plate for ~30 minutes. PMMA was not fully dissolved by time of use.

A micropipette was used to dispense the PMMA/Acetone solution on a test setup without RPM feedback.

Variable space was explored semi-arbitrarily. Spin time was around 10s. Acceleration was controlled by the ESC.

The following data is written down post-factum and shouldn't be relied upon until verified against video footage.

^ Volume (uL) ^ Method  ^ ESC pulse time (uS) ^ Voltage ^ Notes ^ 
| ~1500       | Dynamic | 1400                | 12      | {{:projects:spincoater:img_20260118_213055_612.jpg?linkonly|Photo}} Very uneven. |
| ~100        | Static  | 1100                | 12      | {{ :projects:spincoater:img_20260118_215040_809.jpg?linkonly|Photo}} Center spot visible (initial solution location). |
| ~100        | Static  | 1100                | 10      | {{ :projects:spincoater:img_20260118_215414_548.jpg?linkonly|Photo}} Without center spot visible. |