Inexpensive Open Source Laser Cut Model Kits for the Teaching of Molecular Geometry
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
We recently published an article in the Journal of Chemical Education on VSEPR model kits for helping teach molecular geometry. We have used these transparent acrylic models for several years now at the University of Victoria, but the challenges of COVID-19 meant that this year we needed to make a faster, less expensive version that could be easily mailed out to our students, without requiring any sorting and packaging steps. Accordingly, we designed a version that can be cut out of 2 mm thick recycled “chipboard” cardboard, in which all 26 parts for the 13 different models fit in one piece of card 175 × 120 mm (and 16 of these kits can be cut from one sheet in the laser cutter). The material cost is less than $0.25 per kit and the cutting time on our machine (Trotec Speedy360, 130 W) is 1 minute and 45 seconds per kit. These files are made freely available for all interested users as supporting information for this contribution, in CorelDraw, Adobe Illustrator, pdf and dxf formats.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it