First-time builders completed the v4.1 build in a mean of 39.1 minutes with SUS 74.6 (Good), but showed higher assembly Mental Demand than developers and tactile fragility concerns around snap-fit components¶

Claim · All claims
Evidence · 1 study (2 entries) · design r2 · q2
Currency · newest study 2026 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? User Mental Demand during assembly remained higher than that of developers, which participants attributed to the effort of identifying parts and wiring identification. → Farnaz Baksh 2026 q2 i? Several first-time builders feared breaking snap-fit components when encountering insertion resistance, a tactile fragility absent among developers and specific to first-time builders. → Farnaz Baksh 2026 (2)

Evidence¶

Farnaz Baksh 2026¶

Farnaz Baksh, Matevž B. Zorec, Feiazie Baksh, and Karl Kruusamäe. (2026). Co-Creating Buildable and Open Social Robot Study Companions with University Students. https://arxiv.org/abs/2606.15239 doi:10.48550/arxiv.2606.15239

q2 · i? · design · r2

Study 2 NASA-TLX subscale comparison against Study 1 developers, reported via Fig. 4. The article attributes the difference to part identification effort per participants; no statistic is printed.

"However, user Mental Demand during assembly remained higher than that of developers (Fig. 4), which participants attributed to the effort of identifying parts and reinforcing wiring identification."

Farnaz Baksh 2026 (2)¶

Farnaz Baksh, Matevž B. Zorec, Feiazie Baksh, and Karl Kruusamäe. (2026). Co-Creating Buildable and Open Social Robot Study Companions with University Students. https://arxiv.org/abs/2606.15239

q2 · i? · qualitative · r2

Study 2 qualitative debriefs with the seven first-time builders. The article notes this tactile fragility was absent among developers in Study 1 and represents a feedback issue distinct from documentation clarity.

"Several participants reported concerns around snap-fit components, un-certain whether resistance signalled an error or correct insertion: “Scared I would break things with the components that are meant to snap in” (P3-GY)."

Discussion¶

Related Claims¶

• The v4.1 redesign reduced mean developer assembly time from 21.4 to 13.7 minutes, but the first-attempt-only mean was 20.4 minutes, with the further reduction reflecting a junior learning effect — related
• Video-only documentation created a pause-act-rewind cycle, with orientation and navigation-continuity clarity scoring lowest and wiring identification the primary difficulty for first-time builders — related
• DfA/DfD-informed mechanical redesign of the RSC chassis raised developers' perceived usability from Poor (SUS 59.4) to Excellent (SUS 89.4) — related
• The v4.1 redesign achieved tool-free serviceability, with disassembly workload reduction consistent across all measures and disassembly rated near-perfectly easy — related